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fixed opcode table

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Lauchmelder 2021-10-23 15:55:54 +02:00
parent 92d92a80c6
commit cb890b0960
3 changed files with 5 additions and 5 deletions
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2
NES Emulator/cpu.c
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@ -403,7 +403,7 @@ void execute(struct CPU* cpu)
cpu->x--; cpu->x--;
cpu->status.negative = ((cpu->x & 0x80) == 0x80); cpu->status.negative = ((cpu->x & 0x80) == 0x80);
cpu->status.zero = (cpu->x == 0x80); cpu->status.zero = (cpu->x == 0x00);
} break; } break;
case DEY: case DEY:

4
NES Emulator/log.c
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@ -19,7 +19,7 @@ void logBusState(struct Bus* bus)
sprintf(buffer + 3 * i, "%02X ", instructionBytes[i]); sprintf(buffer + 3 * i, "%02X ", instructionBytes[i]);
} }
printf("%-10s%s ", buffer, bus->cpu->currentOpcode->str); printf("%-9s%c%s ", buffer, (bus->cpu->currentOpcode->illegal ? '*' : ' '), bus->cpu->currentOpcode->str);
switch (bus->cpu->currentOpcode->addr) switch (bus->cpu->currentOpcode->addr)
{ {
@ -32,7 +32,7 @@ void logBusState(struct Bus* bus)
case IND: sprintf(buffer, "($%04X) -> $%04X", (instructionBytes[2] << 8) | instructionBytes[1], bus->cpu->fetchedAddress); break; case IND: sprintf(buffer, "($%04X) -> $%04X", (instructionBytes[2] << 8) | instructionBytes[1], bus->cpu->fetchedAddress); break;
case INDX: sprintf(buffer, "($%02X, X) -> $%04X", instructionBytes[1], bus->cpu->fetchedAddress); break; case INDX: sprintf(buffer, "($%02X, X) -> $%04X", instructionBytes[1], bus->cpu->fetchedAddress); break;
case INDY: sprintf(buffer, "($%02X), Y -> $%04X", instructionBytes[1], bus->cpu->fetchedAddress); break; case INDY: sprintf(buffer, "($%02X), Y -> $%04X", instructionBytes[1], bus->cpu->fetchedAddress); break;
case REL: sprintf(buffer, "$%02X", bus->cpu->fetchedRelAddress); break; case REL: sprintf(buffer, "$%02X", (Byte)bus->cpu->fetchedRelAddress); break;
case ZPG: sprintf(buffer, "$%02X", bus->cpu->fetchedAddress); break; case ZPG: sprintf(buffer, "$%02X", bus->cpu->fetchedAddress); break;
case ZPX: sprintf(buffer, "$%02X, X -> $%02X", instructionBytes[1], bus->cpu->fetchedAddress); break; case ZPX: sprintf(buffer, "$%02X, X -> $%02X", instructionBytes[1], bus->cpu->fetchedAddress); break;
case ZPY: sprintf(buffer, "$%02X, Y -> $%02X", instructionBytes[1], bus->cpu->fetchedAddress); break; case ZPY: sprintf(buffer, "$%02X, Y -> $%02X", instructionBytes[1], bus->cpu->fetchedAddress); break;

4
NES Emulator/opcodes.c
View file

@ -269,9 +269,9 @@ const struct Opcode OPCODE_TABLE[256] =
/* F7 */ NEW_OPCODE(ISC, ZPX, 6, 2, 1), /* F7 */ NEW_OPCODE(ISC, ZPX, 6, 2, 1),
/* F8 */ NEW_OPCODE(SED, IMP, 2, 1, 0), /* F8 */ NEW_OPCODE(SED, IMP, 2, 1, 0),
/* F9 */ NEW_OPCODE(SBC, ABY, 4, 3, 0), /* F9 */ NEW_OPCODE(SBC, ABY, 4, 3, 0),
/* FA */ NEW_OPCODE(SBC, ABY, 4, 3, 1), /* FA */ NEW_OPCODE(NOP, IMP, 2, 1, 1),
/* FB */ NEW_OPCODE(NOP, IMP, 2, 1, 1),
/* FC */ NEW_OPCODE(ISC, ABY, 7, 3, 1), /* FC */ NEW_OPCODE(ISC, ABY, 7, 3, 1),
/* FB */ NEW_OPCODE(NOP, ABX, 4, 3, 1),
/* FD */ NEW_OPCODE(SBC, ABX, 4, 3, 0), /* FD */ NEW_OPCODE(SBC, ABX, 4, 3, 0),
/* FE */ NEW_OPCODE(INC, ABX, 7, 3, 0), /* FE */ NEW_OPCODE(INC, ABX, 7, 3, 0),
/* FF */ NEW_OPCODE(ISC, ABX, 7, 3, 1) /* FF */ NEW_OPCODE(ISC, ABX, 7, 3, 1)