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added LAX

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This commit is contained in:
Lauchmelder 2021-10-23 16:00:40 +02:00
parent cb890b0960
commit 2596ac2c65
2 changed files with 10 additions and 1 deletions
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9
NES Emulator/cpu.c
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@ -462,6 +462,15 @@ void execute(struct CPU* cpu)
cpu->pc.word = cpu->fetchedAddress; cpu->pc.word = cpu->fetchedAddress;
} break; } break;
case LAX:
{
cpu->acc = cpu->fetchedVal;
cpu->x = cpu->fetchedVal;
cpu->status.negative = ((cpu->acc & 0x80) == 0x80);
cpu->status.zero = (cpu->acc == 0x00);
} break;
case LDA: case LDA:
{ {
cpu->acc = cpu->fetchedVal; cpu->acc = cpu->fetchedVal;

2
NES Emulator/opcodes.c
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@ -177,7 +177,7 @@ const struct Opcode OPCODE_TABLE[256] =
/* A0 */ NEW_OPCODE(LDY, IMM, 2, 2, 0), /* A0 */ NEW_OPCODE(LDY, IMM, 2, 2, 0),
/* A1 */ NEW_OPCODE(LDA, INDX, 6, 2, 0), /* A1 */ NEW_OPCODE(LDA, INDX, 6, 2, 0),
/* A2 */ NEW_OPCODE(LDX, IMM, 2, 2, 0), /* A2 */ NEW_OPCODE(LDX, IMM, 2, 2, 0),
/* A3 */ NEW_OPCODE(LAX, INDX, 0, 1, 1), /* A3 */ NEW_OPCODE(LAX, INDX, 6, 2, 1),
/* A4 */ NEW_OPCODE(LDY, ZPG, 3, 2, 0), /* A4 */ NEW_OPCODE(LDY, ZPG, 3, 2, 0),
/* A5 */ NEW_OPCODE(LDA, ZPG, 3, 2, 0), /* A5 */ NEW_OPCODE(LDA, ZPG, 3, 2, 0),
/* A6 */ NEW_OPCODE(LDX, ZPG, 3, 2, 0), /* A6 */ NEW_OPCODE(LDX, ZPG, 3, 2, 0),