115 lines
2.0 KiB
Java
115 lines
2.0 KiB
Java
package com.loomcom.symon;
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import com.loomcom.symon.devices.*;
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import com.loomcom.symon.exceptions.*;
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/**
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* Main control class for the J6502 Simulator.
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*/
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public class Simulator {
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/**
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* Command-line parser used by this simulator.
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*/
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private CommandParser parser;
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/**
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* The CPU itself.
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*/
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private Cpu cpu;
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/**
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* The Bus responsible for routing memory read/write requests to the
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* correct IO devices.
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*/
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private Bus bus;
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public Simulator() throws MemoryRangeException {
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cpu = new Cpu();
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bus = new Bus(0x0000, 0xffff);
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bus.addCpu(cpu);
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bus.addDevice(new Memory(0x0000, 0x10000));
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parser = new CommandParser(System.in, System.out, this);
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}
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public void run() {
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parser.run();
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}
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public void step() {
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}
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public int read(int address) {
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return 0;
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}
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public void write(int address, int value) {
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}
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public void loadProgram(int address, int[] program) {
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// Reset interrupt vector
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int hi = (address&0xff00)>>>8;
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int lo = address&0x00ff;
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bus.write(0xfffc, lo);
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bus.write(0xfffd, hi);
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int i = 0;
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for (int d : program) {
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bus.write(address + i++, d);
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}
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}
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/**
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* A test method.
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*/
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public void runTest() {
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int[] program = {
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0xa9, // LDA #$FF
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0xff,
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0xa0, // LDY #$1A
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0x1a,
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0xa2, // LDX #$90
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0x90,
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0xa2, // LDX #$02
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0x02,
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0x49, // EOR #$FF
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0xff,
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0xa9, // LDA #$00
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0x00,
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0xa2, // LDX #$00
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0x00,
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0x29, // AND #$FF
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0xff,
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0xa0, // LDY #$00
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0x00,
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0x4c, // JMP #$0300
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0x00,
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0x03
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};
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loadProgram(0x0300, program);
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cpu.reset();
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int steps = program.length;
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for (int i = 0; i <= steps; i++) {
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cpu.step();
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System.out.println(cpu.toString());
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}
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}
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/**
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* Main simulator routine.
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*/
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public static void main(String[] args) {
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try {
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new Simulator().runTest();
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} catch (MemoryRangeException ex) {
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System.err.println("Error: " + ex.toString());
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}
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}
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}
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