Seth Morabito
2ebdd254b3
This is something of a "Work in Progress" checkpoint of several features that are all half baked: 1. Allow loading of 16KB ROM files at address $C000 at run-time, not just at startup. See the "Load ROM..." File menu item. 2. Introduces the notion of "CPU Behaviors", so the core 6502 CPU implementation can match the behavior of either an early NMOS 6502, late NMOS 6502, or CMOS 65C02. Very little of this is actually implemented so far. 3. Adds a completely bogus implementation of the 6522 VIA (it does absolutely nothing right now). 4. Changes the address of the ACIA in the simulated system to match a real hardware implementation I put together.
1233 lines
40 KiB
Java
1233 lines
40 KiB
Java
package com.loomcom.symon;
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import com.loomcom.symon.devices.Memory;
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import com.loomcom.symon.exceptions.MemoryAccessException;
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import junit.framework.TestCase;
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public class CpuAbsoluteModeTest extends TestCase {
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protected Cpu cpu;
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protected Bus bus;
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protected Memory mem;
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protected void setUp() throws Exception {
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this.cpu = new Cpu();
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this.bus = new Bus(0x0000, 0xffff);
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this.mem = new Memory(0x0000, 0x10000);
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bus.addCpu(cpu);
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bus.addDevice(mem);
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// Load the reset vector.
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bus.write(0xfffc, Bus.DEFAULT_LOAD_ADDRESS & 0x00ff);
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bus.write(0xfffd, (Bus.DEFAULT_LOAD_ADDRESS & 0xff00) >>> 8);
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cpu.reset();
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// Assert initial state
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assertEquals(0, cpu.getAccumulator());
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assertEquals(0, cpu.getXRegister());
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assertEquals(0, cpu.getYRegister());
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assertEquals(0x200, cpu.getProgramCounter());
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assertEquals(0xff, cpu.getStackPointer());
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assertEquals(0x20, cpu.getProcessorStatus());
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}
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/*
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* The following opcodes are tested for correctness in this file:
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*
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* ORA - $0d
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* ASL - $0e
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* JSR - $20
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* BIT - $2c
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* AND - $2d
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*
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* ROL - $2e
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* JMP - $4c
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* EOR - $4d
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* LSR - $4e
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* ADC - $6d
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*
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* ROR - $6e
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* STY - $8c
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* STA - $8d
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* STX - $8e
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* LDA - $ad
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*
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* LDX - $ae
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* LDY - $bc
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* CMP - $cd
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* CPY - $cc
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* DEC - $ce
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*
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* CPX - $ec
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* SBC - $ed
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* INC - $ee
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*/
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/* ORA - Logical Inclusive OR - $0d */
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public void test_ORA() throws MemoryAccessException {
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// Set some initial values in memory
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bus.write(0x7f00, 0x00);
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bus.write(0x7f02, 0x11);
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bus.write(0x3504, 0x22);
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bus.write(0x3508, 0x44);
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bus.write(0x1210, 0x88);
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bus.loadProgram(0x0d, 0x00, 0x7f, // ORA $7f00
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0x0d, 0x02, 0x7f, // ORA $7f02
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0x0d, 0x04, 0x35, // ORA $3504
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0x0d, 0x08, 0x35, // ORA $3508
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0x0d, 0x10, 0x12); // ORA $1210
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x11, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x33, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x77, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0xff, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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}
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/* ASL - Arithmetic Shift Left - $0e */
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public void test_ASL() throws MemoryAccessException {
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bus.write(0x7f00, 0x00);
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bus.write(0x7f01, 0x01);
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bus.write(0x3502, 0x02);
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bus.write(0x3503, 0x44);
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bus.write(0x1204, 0x80);
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bus.loadProgram(0x0e, 0x00, 0x7f, // ASL $7f00
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0x0e, 0x01, 0x7f, // ASL $7f01
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0x0e, 0x02, 0x35, // ASL $3502
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0x0e, 0x03, 0x35, // ASL $3503
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0x0e, 0x04, 0x12); // ASL $1204
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cpu.step();
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assertEquals(0x00, bus.read(0x7f00));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x02, bus.read(0x7f01));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x04, bus.read(0x3502));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x88, bus.read(0x3503));
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x00, bus.read(0x1204));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getCarryFlag());
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}
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/* JSR - Jump to Subroutine - $20 */
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public void test_JSR() throws MemoryAccessException {
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bus.loadProgram(0xea, // NOP
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0xea, // NOP
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0x20, 0x00, 0x34); // JSR $3400
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cpu.step(3);
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// New PC should be 0x3400
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assertEquals(0x3400, cpu.getProgramCounter());
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// Old PC-1 should be on stack (i.e.: address of third byte of the
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// JSR instruction, 0x0204)
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assertEquals(0x02, bus.read(0x1ff));
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assertEquals(0x04, bus.read(0x1fe));
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// No flags should have changed.
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assertEquals(0x20, cpu.getProcessorStatus());
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}
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/* BIT - Bit Test - $2c */
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public void test_BIT() throws MemoryAccessException {
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bus.write(0x1200, 0xc0);
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bus.loadProgram(0xa9, 0x01, // LDA #$01
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0x2c, 0x00, 0x12, // BIT $1200
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0xa9, 0x0f, // LDA #$0f
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0x2c, 0x00, 0x12, // BIT $1200
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0xa9, 0x40, // LDA #$40
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0x2c, 0x00, 0x12, // BIT $1200
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0xa9, 0x80, // LDA #$80
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0x2c, 0x00, 0x12, // BIT $1200
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0xa9, 0xc0, // LDA #$c0
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0x2c, 0x00, 0x12, // BIT $1200
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0xa9, 0xff, // LDA #$ff
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0x2c, 0x00, 0x12); // BIT $1200
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cpu.step(2);
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assertTrue(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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cpu.step(2);
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assertTrue(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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cpu.step(2);
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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cpu.step(2);
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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cpu.step(2);
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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cpu.step(2);
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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}
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/* AND - Logical AND - $2d */
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public void test_AND() throws MemoryAccessException {
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bus.write(0x1200, 0x00);
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bus.write(0x1201, 0x11);
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bus.write(0x1202, 0xff);
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bus.write(0x1203, 0x99);
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bus.write(0x1204, 0x11);
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bus.write(0x1205, 0x0f);
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bus.loadProgram(0x2d, 0x00, 0x12, // AND $1200
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0x2d, 0x01, 0x12, // AND $1201
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0xa9, 0xaa, // LDA #$aa
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0x2d, 0x02, 0x12, // AND $1202
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0x2d, 0x03, 0x12, // AND $1203
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0x2d, 0x04, 0x12, // AND $1204
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0xa9, 0xff, // LDA #$ff
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0x2d, 0x05, 0x12); // AND $1205
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step(2);
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assertEquals(0xaa, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x88, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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cpu.step(2);
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assertEquals(0x0f, cpu.getAccumulator());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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}
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/* ROL - Rotate Shift Left - $2e */
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public void test_ROL() throws MemoryAccessException {
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bus.write(0x1200, 0x00);
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bus.write(0x1201, 0x01);
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bus.loadProgram(0x2e, 0x00, 0x12, // ROL $1200 (m=%00000000, c=0)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%00000010, c=0)
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0x38, // SEC (m=%00000010, c=1)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%00000101, c=0)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%00001010, c=0)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%00010100, c=0)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%00101000, c=0)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%01010000, c=0)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%10100000, c=0)
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0x2e, 0x01, 0x12, // ROL $1201 (m=%01000000, c=1)
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0x2e, 0x01, 0x12); // ROL $1201 (m=%10000001, c=0)
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cpu.step();
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assertEquals(0x00, bus.read(0x1200));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x02, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step(2);
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assertEquals(0x05, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x0a, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x14, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x28, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x50, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0xa0, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x40, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x81, bus.read(0x1201));
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assertFalse(cpu.getZeroFlag());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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}
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/* JMP - Jump - $4c */
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public void test_JMP() throws MemoryAccessException {
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bus.loadProgram(0x4c, 0x00, 0x34);
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cpu.step();
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assertEquals(0x3400, cpu.getProgramCounter());
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// No change to status flags.
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assertEquals(0x20, cpu.getProcessorStatus());
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}
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/* EOR - Exclusive OR - $4d */
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public void test_EOR() throws MemoryAccessException {
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bus.write(0x1210, 0x00);
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bus.write(0x1211, 0xff);
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bus.write(0x1212, 0x33);
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bus.write(0x1213, 0x44);
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bus.loadProgram(0xa9, 0x88, // LDA #$88
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0x4d, 0x10, 0x12, // EOR $1210
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0x4d, 0x11, 0x12, // EOR $1211
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0x4d, 0x12, 0x12, // EOR $1212
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0x4d, 0x13, 0x12); // EOR $1213
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cpu.step(2);
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assertEquals(0x88, cpu.getAccumulator());
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assertTrue(cpu.getNegativeFlag());
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assertFalse(cpu.getZeroFlag());
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cpu.step();
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assertEquals(0x77, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getZeroFlag());
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cpu.step();
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assertEquals(0x44, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getZeroFlag());
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cpu.step();
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assertEquals(0x00, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getZeroFlag());
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}
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/* LSR - Logical Shift Right - $4e */
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public void test_LSR() throws MemoryAccessException {
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bus.write(0x1200, 0x00);
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bus.write(0x1201, 0x01);
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bus.write(0x1202, 0x02);
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bus.write(0x1203, 0x44);
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bus.write(0x1204, 0x80);
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bus.write(0x1205, 0x02);
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bus.loadProgram(0x4e, 0x00, 0x12, // LSR $1200
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0x4e, 0x01, 0x12, // LSR $1201
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0x4e, 0x02, 0x12, // LSR $1202
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0x4e, 0x03, 0x12, // LSR $1203
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0x4e, 0x04, 0x12, // LSR $1204
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0x38, // SEC
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0x4e, 0x05, 0x12); // LSR $1205
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cpu.step();
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assertEquals(0x00, bus.read(0x1200));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x00, bus.read(0x1201));
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assertTrue(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertTrue(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x01, bus.read(0x1202));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x22, bus.read(0x1203));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.step();
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assertEquals(0x40, bus.read(0x1204));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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// Setting Carry should not affect the result.
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cpu.step(2);
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assertEquals(0x01, bus.read(0x1205));
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getCarryFlag());
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}
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/* ADC - Add with Carry - $6d */
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public void test_ADC() throws MemoryAccessException {
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bus.write(0x1210, 0x01);
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bus.write(0x1211, 0xff);
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bus.loadProgram(0xa9, 0x00, // LDA #$00
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0x6d, 0x10, 0x12); // ADC $1210
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cpu.step(2);
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assertEquals(0x01, cpu.getAccumulator());
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assertFalse(cpu.getNegativeFlag());
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assertFalse(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.reset();
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bus.loadProgram(0xa9, 0x7f, // LDA #$7f
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0x6d, 0x10, 0x12); // ADC $1210
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cpu.step(2);
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assertEquals(0x80, cpu.getAccumulator());
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assertTrue(cpu.getNegativeFlag());
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assertTrue(cpu.getOverflowFlag());
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assertFalse(cpu.getZeroFlag());
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assertFalse(cpu.getCarryFlag());
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cpu.reset();
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bus.loadProgram(0xa9, 0x80, // LDA #$80
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0x6d, 0x10, 0x12); // ADC $1210
|
|
cpu.step(2);
|
|
assertEquals(0x81, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0xff, // LDA #$ff
|
|
0x6d, 0x10, 0x12); // ADC $10
|
|
cpu.step(2);
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x00, // LDA #$00
|
|
0x6d, 0x11, 0x12); // ADC $11
|
|
cpu.step(2);
|
|
assertEquals(0xff, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x7f, // LDA #$7f
|
|
0x6d, 0x11, 0x12); // ADC $11
|
|
cpu.step(2);
|
|
assertEquals(0x7e, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x80, // LDA #$80
|
|
0x6d, 0x11, 0x12); // ADC $11
|
|
cpu.step(2);
|
|
assertEquals(0x7f, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertTrue(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0xff, // LDA #$ff
|
|
0x6d, 0x11, 0x12); // ADC $11
|
|
cpu.step(2);
|
|
assertEquals(0xfe, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
}
|
|
|
|
public void test_ADC_IncludesCarry() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x01);
|
|
|
|
bus.loadProgram(0xa9, 0x00, // LDA #$00
|
|
0x38, // SEC
|
|
0x6d, 0x10, 0x12); // ADC $10
|
|
cpu.step(3);
|
|
assertEquals(0x02, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
}
|
|
|
|
public void test_ADC_DecimalMode() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x01);
|
|
bus.write(0x1211, 0x99);
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x01, // LDA #$01
|
|
0x6d, 0x10, 0x12); // ADC $10
|
|
cpu.step(3);
|
|
assertEquals(0x02, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x49, // LDA #$49
|
|
0x6d, 0x10, 0x12); // ADC $10
|
|
cpu.step(3);
|
|
assertEquals(0x50, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x50, // LDA #$50
|
|
0x6d, 0x10, 0x12); // ADC $10
|
|
cpu.step(3);
|
|
assertEquals(0x51, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x99, // LDA #$99
|
|
0x6d, 0x10, 0x12); // ADC $10
|
|
cpu.step(3);
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x00, // LDA #$00
|
|
0x6d, 0x11, 0x12); // ADC $10
|
|
cpu.step(3);
|
|
assertEquals(0x99, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x49, // LDA #$49
|
|
0x6d, 0x11, 0x12); // ADC $11
|
|
cpu.step(3);
|
|
assertEquals(0x48, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x50, // LDA #$59
|
|
0x6d, 0x11, 0x12); // ADC $11
|
|
cpu.step(3);
|
|
assertEquals(0x49, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
}
|
|
|
|
/* ROR - Rotate Right - $6e */
|
|
|
|
public void test_ROR() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x10);
|
|
|
|
bus.loadProgram(0x6e, 0x10, 0x12, // ROR $1200 (m=%00000000, c=0)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%00001000, c=0)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%00000100, c=0)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%00000010, c=0)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%00000001, c=0)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%00000000, c=1)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%10000000, c=0)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%01000000, c=0)
|
|
0x6e, 0x11, 0x12, // ROR $1201 (m=%00100000, c=0)
|
|
0x6e, 0x11, 0x12); // ROR $1201 (m=%00010000, c=0)
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x1210));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x08, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x04, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x02, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x01, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x1211));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x40, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x20, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x10, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
}
|
|
|
|
/* STY - Store Y Register - $8c */
|
|
|
|
public void test_STY() throws MemoryAccessException {
|
|
cpu.setYRegister(0x00);
|
|
bus.loadProgram(0x8c, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x1210));
|
|
// STY should have NO effect on flags.
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setYRegister(0x0f);
|
|
bus.loadProgram(0x8c, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x0f, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setYRegister(0x80);
|
|
bus.loadProgram(0x8c, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* STA - Store Accumulator - $8d */
|
|
|
|
public void test_STA() throws MemoryAccessException {
|
|
cpu.setAccumulator(0x00);
|
|
bus.loadProgram(0x8d, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x1210));
|
|
// STA should have NO effect on flags.
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setAccumulator(0x0f);
|
|
bus.loadProgram(0x8d, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x0f, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setAccumulator(0x80);
|
|
bus.loadProgram(0x8d, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* STX - Store X Register - $8e */
|
|
|
|
public void test_STX() throws MemoryAccessException {
|
|
cpu.setXRegister(0x00);
|
|
bus.loadProgram(0x8e, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x1210));
|
|
// STX should have NO effect on flags.
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setXRegister(0x0f);
|
|
bus.loadProgram(0x8e, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x0f, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
cpu.setXRegister(0x80);
|
|
bus.loadProgram(0x8e, 0x10, 0x12);
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* LDA - Load Accumulator - $ad */
|
|
|
|
public void test_LDA() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x0f);
|
|
bus.write(0x1212, 0x80);
|
|
|
|
bus.loadProgram(0xad, 0x10, 0x12, // LDA $1210
|
|
0xad, 0x11, 0x12, // LDA $1211
|
|
0xad, 0x12, 0x12); // LDA $1212
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x0f, cpu.getAccumulator());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, cpu.getAccumulator());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* LDX - Load X Register - $ae */
|
|
|
|
public void test_LDX() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x0f);
|
|
bus.write(0x1212, 0x80);
|
|
|
|
bus.loadProgram(0xae, 0x10, 0x12, // LDX $1210
|
|
0xae, 0x11, 0x12, // LDX $1211
|
|
0xae, 0x12, 0x12); // LDX $1212
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, cpu.getXRegister());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x0f, cpu.getXRegister());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, cpu.getXRegister());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* LDY - Load Y Register - $bc */
|
|
|
|
public void test_LDY() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x0f);
|
|
bus.write(0x1212, 0x80);
|
|
|
|
bus.loadProgram(0xbc, 0x10, 0x12, // LDY $1210
|
|
0xbc, 0x11, 0x12, // LDY $1211
|
|
0xbc, 0x12, 0x12); // LDY $1212
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, cpu.getYRegister());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x0f, cpu.getYRegister());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, cpu.getYRegister());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* CMP - Compare Accumulator - $cd */
|
|
|
|
public void test_CMP() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x80);
|
|
bus.write(0x1212, 0xff);
|
|
|
|
cpu.setAccumulator(0x80);
|
|
|
|
bus.loadProgram(0xcd, 0x10, 0x12, // CMP $1210
|
|
0xcd, 0x11, 0x12, // CMP $1211
|
|
0xcd, 0x12, 0x12); // CMP $1212
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m > y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // m - y < 0
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m = y
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag()); // m - y == 0
|
|
|
|
cpu.step();
|
|
assertFalse(cpu.getCarryFlag()); // m < y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // m - y > 0
|
|
}
|
|
|
|
/* CPY - Compare Y Register - $cc */
|
|
|
|
public void test_CPY() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x80);
|
|
bus.write(0x1212, 0xff);
|
|
|
|
cpu.setYRegister(0x80);
|
|
|
|
bus.loadProgram(0xcc, 0x10, 0x12, // CPY $1210
|
|
0xcc, 0x11, 0x12, // CPY $1211
|
|
0xcc, 0x12, 0x12); // CPY $1212
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m > y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // m - y < 0
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m = y
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag()); // m - y == 0
|
|
|
|
cpu.step();
|
|
assertFalse(cpu.getCarryFlag()); // m < y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // m - y = $81
|
|
}
|
|
|
|
/* DEC - Decrement Memory Location - $ce */
|
|
|
|
public void test_DEC() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x01);
|
|
bus.write(0x1212, 0x80);
|
|
bus.write(0x1213, 0xff);
|
|
|
|
bus.loadProgram(0xce, 0x10, 0x12, // DEC $1210
|
|
0xce, 0x11, 0x12, // DEC $1211
|
|
0xce, 0x12, 0x12, // DEC $1212
|
|
0xce, 0x13, 0x12); // DEC $1213
|
|
|
|
cpu.step();
|
|
assertEquals(0xff, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x1211));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x7f, bus.read(0x1212));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0xfe, bus.read(0x1213));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
}
|
|
|
|
/* CPX - Compare X Register - $ec */
|
|
|
|
public void test_CPX() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x80);
|
|
bus.write(0x1212, 0xff);
|
|
|
|
cpu.setXRegister(0x80);
|
|
|
|
bus.loadProgram(0xec, 0x10, 0x12, // CPX $1210
|
|
0xec, 0x11, 0x12, // CPX $1211
|
|
0xec, 0x12, 0x12); // CPX $1212
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m > y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // m - y < 0
|
|
|
|
cpu.step();
|
|
assertTrue(cpu.getCarryFlag()); // m = y
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag()); // m - y == 0
|
|
|
|
cpu.step();
|
|
assertFalse(cpu.getCarryFlag()); // m < y
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag()); // $80 - $ff = 81
|
|
}
|
|
|
|
/* SBC - Subtract with Carry (borrow) - $ed */
|
|
|
|
public void test_SBC() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x01);
|
|
|
|
bus.loadProgram(0xa9, 0x00, // LDA #$00
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(2);
|
|
assertEquals(0xfe, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x7f, // LDA #$7f
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(2);
|
|
assertEquals(0x7d, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x80, // LDA #$80
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(2);
|
|
assertEquals(0x7e, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertTrue(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0xff, // LDA #$ff
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(2);
|
|
assertEquals(0xfd, cpu.getAccumulator());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
bus.loadProgram(0xa9, 0x02, // LDA #$02
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(2);
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertTrue(cpu.getCarryFlag());
|
|
}
|
|
|
|
public void test_SBC_IncludesNotOfCarry() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x01);
|
|
|
|
// Subtrace with Carry Flag cleared
|
|
bus.loadProgram(0x18, // CLC
|
|
0xa9, 0x05, // LDA #$00
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
|
|
cpu.step(3);
|
|
assertEquals(0x03, cpu.getAccumulator());
|
|
|
|
cpu.reset();
|
|
|
|
// Subtrace with Carry Flag cleared
|
|
bus.loadProgram(0x18, // CLC
|
|
0xa9, 0x00, // LDA #$00
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
|
|
cpu.step(3);
|
|
assertEquals(0xfe, cpu.getAccumulator());
|
|
|
|
cpu.reset();
|
|
|
|
// Subtract with Carry Flag set
|
|
bus.loadProgram(0x38, // SEC
|
|
0xa9, 0x05, // LDA #$00
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(3);
|
|
assertEquals(0x04, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
|
|
cpu.reset();
|
|
|
|
// Subtract with Carry Flag set
|
|
bus.loadProgram(0x38, // SEC
|
|
0xa9, 0x00, // LDA #$00
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(3);
|
|
assertEquals(0xff, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag());
|
|
|
|
}
|
|
|
|
public void test_SBC_DecimalMode() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x01);
|
|
bus.write(0x1220, 0x11);
|
|
|
|
bus.loadProgram(0xf8,
|
|
0xa9, 0x00,
|
|
0xed, 0x10, 0x12);
|
|
cpu.step(3);
|
|
assertEquals(0x98, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag()); // borrow = set flag
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8,
|
|
0xa9, 0x99,
|
|
0xed, 0x10, 0x12);
|
|
cpu.step(3);
|
|
assertEquals(0x97, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag()); // No borrow = clear flag
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8,
|
|
0xa9, 0x50,
|
|
0xed, 0x10, 0x12);
|
|
cpu.step(3);
|
|
assertEquals(0x48, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x02, // LDA #$02
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(3);
|
|
assertEquals(0x00, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0xf8, // SED
|
|
0xa9, 0x10, // LDA #$10
|
|
0xed, 0x20, 0x12); // SBC $20
|
|
cpu.step(3);
|
|
assertEquals(0x98, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0x38, // SEC
|
|
0xf8, // SED
|
|
0xa9, 0x05, // LDA #$05
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(4);
|
|
assertEquals(0x04, cpu.getAccumulator());
|
|
assertTrue(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
|
|
cpu.reset();
|
|
|
|
bus.loadProgram(0x38, // SEC
|
|
0xf8, // SED
|
|
0xa9, 0x00, // LDA #$00
|
|
0xed, 0x10, 0x12); // SBC $1210
|
|
cpu.step(4);
|
|
assertEquals(0x99, cpu.getAccumulator());
|
|
assertFalse(cpu.getCarryFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
assertFalse(cpu.getOverflowFlag());
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getDecimalModeFlag());
|
|
}
|
|
|
|
/* INC - Increment Memory Location - $ee */
|
|
|
|
public void test_INC() throws MemoryAccessException {
|
|
bus.write(0x1210, 0x00);
|
|
bus.write(0x1211, 0x7f);
|
|
bus.write(0x1212, 0xff);
|
|
|
|
bus.loadProgram(0xee, 0x10, 0x12, // INC $1210
|
|
0xee, 0x11, 0x12, // INC $1211
|
|
0xee, 0x12, 0x12); // INC $1212
|
|
|
|
cpu.step();
|
|
assertEquals(0x01, bus.read(0x1210));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x80, bus.read(0x1211));
|
|
assertFalse(cpu.getZeroFlag());
|
|
assertTrue(cpu.getNegativeFlag());
|
|
|
|
cpu.step();
|
|
assertEquals(0x00, bus.read(0x1212));
|
|
assertTrue(cpu.getZeroFlag());
|
|
assertFalse(cpu.getNegativeFlag());
|
|
|
|
}
|
|
|
|
}
|