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Added LDX, LDY immediate.

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This commit is contained in:
Seth Morabito 2008-12-12 00:45:55 -08:00
parent fb3db6b65f
commit 6915331cca
1 changed files with 9 additions and 3 deletions
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12
src/main/java/com/loomcom/lm6502/Cpu.java
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@ -74,7 +74,7 @@ public class Cpu implements InstructionTable {
incProgramCounter();
// Decode the instruction and operands
int size = instructionSizes[ir];
int size = Cpu.instructionSizes[ir];
for (int i = 0; i < size-1; i++) {
operands[i] = bus.read(pc);
// Increment PC after reading
@ -85,6 +85,7 @@ public class Cpu implements InstructionTable {
switch(ir) {
case 0x00: // HLT
// TODO: Halt!
break;
case 0x01: // n/a
break;
@ -415,11 +416,15 @@ public class Cpu implements InstructionTable {
case 0x9f: // n/a
break;
case 0xa0: // n/a
case 0xa0: // LDY - Immediate
y = operands[0];
// TODO: Set Zero Flag, Negative Flag
break;
case 0xa1: // n/a
break;
case 0xa2: // n/a
case 0xa2: // LDX - Immediate
x = operands[0];
// TODO: Set Zero Flag, Negative Flag
break;
case 0xa3: // n/a
break;
@ -435,6 +440,7 @@ public class Cpu implements InstructionTable {
break;
case 0xa9: // LDA - Immediate
a = operands[0];
// TODO: Set Zero Flag, Negative Flag
break;
case 0xaa: // n/a
break;