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another link to illegal instructions

This commit is contained in:
Irmen de Jong 2020-03-15 18:54:07 +01:00
parent c2d6954327
commit 3925c80258
1 changed files with 5 additions and 3 deletions
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8
src/main/kotlin/razorvine/ksim65/Cpu6502.kt
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@ -1408,12 +1408,14 @@ open class Cpu6502 : BusComponent() {
return false
}
// unofficial/illegal 6502 instructions
// unofficial/illegal 6502 instructions now follow
// see http://www.ffd2.com/fridge/docs/6502-NMOS.extra.opcodes
// and http://unusedino.de/ec64/technical/aay/c64/ibmain.htm
// or https://github.com/quietust/nintendulator/blob/master/src/CPU.cpp (search for LogBadOps)
// or https://github.com/stardot/b-em/blob/master/src/6502.c
// TODO: some of these may be implemented incorrectly / are not finished yet
// or https://github.com/wpmed92/MedNES/blob/master/NES/6502.cpp
// TODO: some of the instructions below may be implemented incorrectly / are not finished yet
private fun iAhx(): Boolean {
val addrHi = 0xff // TODO get the correct byte from the instruction (=last byte read)