I'm adding all the unofficial opcodes requested by the test rom "instr_timing" by blargg, but... it's testing a few unstable or "not recommend to use" unofficial opcodes... like AHX. From this 6502 page, description says...
OK, but wtf is this "H" value???
Code:
Combinations of STA/STX/STY:
AHX {adr} = stores A&X&H into {adr}
SHX {adr} = stores X&H into {adr}
SHY {adr} = stores Y&H into {adr}
note: sometimes the &H drops off. Also page boundary crossing will not work as expected (the bank where the value is stored may be equal to the value stored).
AHX {adr} = stores A&X&H into {adr}
SHX {adr} = stores X&H into {adr}
SHY {adr} = stores Y&H into {adr}
note: sometimes the &H drops off. Also page boundary crossing will not work as expected (the bank where the value is stored may be equal to the value stored).
OK, but wtf is this "H" value???