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Fix ATX opcode in the CPU, no timing changes, just a small behavior change (unofficial opcode 0xAB)

This commit is contained in:
qeed 2009-06-13 17:40:42 +00:00
parent 726c838ead
commit 851a4f7ad7
1 changed files with 3 additions and 2 deletions
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5
src/ops.inc
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@ -343,8 +343,9 @@ case 0x6B: {
/* ASR */ /* ASR */
case 0x4B: LD_IM(AND;LSRA); case 0x4B: LD_IM(AND;LSRA);
/* ATX(OAL) Is this(OR with $EE) correct? */ /* ATX(OAL) Is this(OR with $EE) correct? Blargg did some test
case 0xAB: LD_IM(_A|=0xEE;AND;_X=_A); and found the constant to be OR with is $FF for NES */
case 0xAB: LD_IM(_A|=0xFF;AND;_X=_A);
/* AXS */ /* AXS */
case 0xCB: LD_IM(AXS); case 0xCB: LD_IM(AXS);