Path: utzoo!utgpu!water!watmath!clyde!burl!codas!killer!elg
From: elg@killer.UUCP (Eric Green)
Newsgroups: comp.sys.cbm
Subject: 6522/fast mode
Message-ID: <2770@killer.UUCP>
Date: 10 Jan 88 18:39:40 GMT
Reply-To: elg@killer.UUCP (Eric Green)
Organization: Bayou Telecommunications
Lines: 18

Is there any reason why the 6522's shift register can't be used for fast mode?
I just looked at the 6522 data sheet, and its shift register isn't
significantly different from the 6526's... so why is there a 6526 in the 
1571? Is there some bug in the 6522?

This was all prompted by a piece of mail I got, asking if it would be possible
to use a 1541 in fast mode with a C-128. The 1541, of course, doesn't have a
6526 in it, and, of course, the 6526 isn't pin-compatible with a 6522...
which means that if it's possible, with few modifications, it better darn well
be possible with a 6522 (sorry, I refuse to consider daughter-boards,
impossible to wire-wrap'em and hacking up your 1541 is hardly something to be
done on a mass-produced basis, 1541 Flash! to the contrary).

--
Eric Lee Green  elg@usl.CSNET     Asimov Cocktail,n., A verbal bomb
{cbosgd,ihnp4}!killer!elg              detonated by the mention of any
Snail Mail P.O. Box 92191              subject, resulting in an explosion
Lafayette, LA 70509                    of at least 5,000 words.