Re: apple][ or ][+ software not working on 65C02

[Linards Ticmanis <ticmanis@gmx.de>]

vladitx wrote:

> Are there any Apple ][ or ][+ titles (games or whatever) which use
> some of the undocumented opcodes, and which don't work on the 65C02?
> Multi-cycle NOP instructions and alikes that just take few cycles (and
> confuse people and emulators) don't count.

The original release of "Ultima I" reputedly doesn't allow hitting the
bad guys in the "Outer Space" action sequence, because of an
undocumented opcode being used.

The source code for older releases (anything before the current 1.13.2)
of AppleWin contains a number of comments in the CPU.cpp file hinting at
games that need specific opcodes to (at least) NOP in a certain specific
way.

-- 
Linards Ticmanis