Path: utzoo!attcan!uunet!husc6!encore!bu.edu!snorkelwacker!apple!landon
From: landon@Apple.COM (Landon Dyer)
Newsgroups: comp.sys.atari.8bit
Subject: Re: 6502 error conditions
Message-ID: <44946@apple.Apple.COM>
Date: 19 Sep 90 12:04:11 GMT
Organization: Apple Computer Inc., Cupertino, CA
Lines: 26


>The really depressing thing is:  How tough could it have been?  I
>realise that the 6502 microcode really packs 'em in, but it's
>pretty poor programming style not to handle error conditions.

There's worse.  Early 6502s (pre June '76) didn't have ROR.

There were some articles eight or nine years ago that discussed the
"undocumented" 6502 instructions (for some particular mask-version of the
chip, I suppose).  Some of them were pretty odd, like "Store A Immediate"
or (memory begins to fail me now:) "TYA and increment S."

More trivia: Leonard Tramiel claimed that the world's record for a "stock"
6502 is 25 Mhz (sans cooling -- the champ got REAL hot before it died).
Anyone for a dry-ice-fueled, six MIP 68K-killer?  :-)


Landon Dyer (landon@apple.com)  :::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::::: making the merry-go-round SPIN FASTER
Apple Computer, Inc.            :: so that everyone has to HOLD ON TIGHTER
NOT THE VIEWS OF APPLE COMPUTER :: just to keep from being THROWN TO THE WOLVES
-- 
Landon Dyer (landon@apple.com)  :::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::::: making the merry-go-round SPIN FASTER
Apple Computer, Inc.            :: so that everyone has to HOLD ON TIGHTER
NOT THE VIEWS OF APPLE COMPUTER :: just to keep from being THROWN TO THE WOLVES