Date   : Tue, 13 Sep 1994 14:40:25 +0000
From   : lamcw <lamcw@...>
Subject: Re: Address modes

David Barnett wrote:

;The best way not to miss anything is to make your 6502 emulation work the
;way the chip does:  Make all memory references go through one process which
;then checks for memory mapped addresses.  That way, you can cover obscure
;effects (including an indexed addressing bug in the chip on an indexed read
;which can touch two locations a page apart).  You are also covered for the
;extended opcodes of the 65c02 used in the Master.

yes, in an ideal world i would agree with you. but if i were to do this for
every conceiveable case, my emulator will grind to a standstill, rendering
it next to useless. the fun lies in seeing what you can get away with.


chris lam.