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LDX implementation

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This commit is contained in:
jborza 2019-04-14 22:04:16 +02:00
parent bcf8632cbc
commit d0af0057b7
1 changed files with 16 additions and 7 deletions
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23
cpu.c
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@ -58,6 +58,11 @@ void LDA(State6502* state, byte operand) {
set_NV_flags(state, state->a);
}
void LDX(State6502* state, byte operand) {
state->x = operand;
set_NV_flags(state, state->x);
}
word pop_word(State6502* state) {
byte low = pop_byte(state);
byte high = pop_byte(state);
@ -166,8 +171,12 @@ int emulate_6502_op(State6502 * state) {
case NOP: break; //NOP
case PHA: unimplemented_instruction(state); break;
case PLA: unimplemented_instruction(state); break;
case PHP: unimplemented_instruction(state); break;
case PLP: unimplemented_instruction(state); break;
case PHP: //push processor status
//push(state->flags);
unimplemented_instruction(state); break;
case PLP: //pull procesor status
//state->flags = pop();
unimplemented_instruction(state); break;
case RTI: unimplemented_instruction(state); break;
case RTS: unimplemented_instruction(state); break;
case SEC: unimplemented_instruction(state); break;
@ -224,11 +233,11 @@ int emulate_6502_op(State6502 * state) {
case LDA_ABSY: LDA(state, get_byte_absolute_y(state)); break;
case LDA_INDX: LDA(state, get_byte_indirect_x(state)); break;
case LDA_INDY: LDA(state, get_byte_indirect_y(state)); break;
case LDX_IMM: unimplemented_instruction(state); break;
case LDX_ZP: unimplemented_instruction(state); break;
case LDX_ZPY: unimplemented_instruction(state); break;
case LDX_ABS: unimplemented_instruction(state); break;
case LDX_ABSY: unimplemented_instruction(state); break;
case LDX_IMM: LDX(state, pop_byte(state)); break;
case LDX_ZP: LDX(state, get_byte_zero_page(state)); break;
case LDX_ZPY: LDX(state, get_byte_zero_page_y(state)); break;
case LDX_ABS: LDX(state, get_byte_absolute_x(state)); break;
case LDX_ABSY: LDX(state, get_byte_absolute_y(state)); break;
case LDY_IMM: unimplemented_instruction(state); break;
case LDY_ZP: unimplemented_instruction(state); break;
case LDY_ZPX: unimplemented_instruction(state); break;