RuiFPB/ksymon
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More implied mode instructions implemented, with tests.

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This commit is contained in:
Seth J. Morabito committed 2008-12-23 16:06:09 -08:00
1 parent 473b47e832
commit f012ba7775
2 files changed
+327 -12
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src/main/java/com/loomcom/symon/Cpu.java
+35 -12
View File
@@ -96,6 +96,8 @@ public class Cpu implements InstructionTable {
* Performs an individual machine cycle.
*/
public void step() {
int lo, hi; // Used in address calculation
// Store the address from which the IR was read, for debugging
addr = pc;
@@ -143,7 +145,8 @@ public class Cpu implements InstructionTable {
break;
case 0x07: // n/a
break;
case 0x08: // n/a
case 0x08: // PHP - Push Processor Status - Implied
stackPush(getProcessorStatus());
break;
case 0x09: // ORA - Immediate
a |= operands[0];
@@ -212,7 +215,8 @@ public class Cpu implements InstructionTable {
break;
case 0x27: // n/a
break;
case 0x28: // n/a
case 0x28: // PLP - Pull Processor Status - Implied
setProcessorStatus(stackPop());
break;
case 0x29: // n/a
a &= operands[0];
@@ -265,7 +269,11 @@ public class Cpu implements InstructionTable {
case 0x3f: // n/a
break;
case 0x40: // n/a
case 0x40: // RTI - Return from Interrupt - Implied
setProcessorStatus(stackPop());
lo = stackPop();
hi = stackPop();
setProgramCounter(CpuUtils.address(lo, hi));
break;
case 0x41: // n/a
break;
@@ -281,7 +289,8 @@ public class Cpu implements InstructionTable {
break;
case 0x47: // n/a
break;
case 0x48: // n/a
case 0x48: // PHA - Push Accumulator - Implied
stackPush(a);
break;
case 0x49: // EOR - Immediate
a ^= operands[0];
@@ -317,7 +326,7 @@ public class Cpu implements InstructionTable {
break;
case 0x57: // n/a
break;
case 0x58: // CLI - Clear Interrupt Disable, Implied
case 0x58: // CLI - Clear Interrupt Disable - Implied
clearIrqDisableFlag();
break;
case 0x59: // n/a
@@ -335,7 +344,11 @@ public class Cpu implements InstructionTable {
case 0x5f: // n/a
break;
case 0x60: // n/a
case 0x60: // RTS - Return from Subrouting - Implied
lo = stackPop();
hi = stackPop();
setProgramCounter((CpuUtils.address(lo, hi) - 1) & 0xffff);
break;
case 0x61: // n/a
break;
@@ -351,7 +364,9 @@ public class Cpu implements InstructionTable {
break;
case 0x67: // n/a
break;
case 0x68: // n/a
case 0x68: // PLA - Pull Accumulator - Implied
a = stackPop();
setArithmeticFlags(a);
break;
case 0x69: // ADC - Immediate Mode
a = adc(a, operands[0]);
@@ -420,7 +435,9 @@ public class Cpu implements InstructionTable {
break;
case 0x87: // n/a
break;
case 0x88: // n/a
case 0x88: // DEY - Decrement the Y Register - Implied
y = --y & 0xff;
setArithmeticFlags(y);
break;
case 0x89: // n/a
break;
@@ -560,12 +577,16 @@ public class Cpu implements InstructionTable {
break;
case 0xc7: // n/a
break;
case 0xc8: // n/a
case 0xc8: // INY - Increment the Y Register - Implied
y = ++y & 0xff;
setArithmeticFlags(y);
break;
case 0xc9: // CMP - Immediate
cmp(a, operands[0]);
break;
case 0xca: // n/a
case 0xca: // DEX - Decrement the X Register - Implied
x = --x & 0xff;
setArithmeticFlags(x);
break;
case 0xcb: // n/a
break;
@@ -629,9 +650,11 @@ public class Cpu implements InstructionTable {
break;
case 0xe7: // n/a
break;
case 0xe8: // n/a
case 0xe8: // INX - Increment X Register - Implied
x = ++x & 0xff;
setArithmeticFlags(x);
break;
case 0xe9: // n/a
case 0xe9: // SBC - Subtract with Carry (Borrow) - Immediate
a = sbc(a, operands[0]);
setArithmeticFlags(a);
break;