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From: kaye@FSCORE.dec.com (Mark Kaye - He who dies with the most toys - is dead!)
Newsgroups: comp.sys.amiga.tech
Subject: 2090A & Floppy & Quarterback problem
Message-ID: <3018@shlump.dec.com>
Date: 17 Jun 89 01:17:43 GMT
Sender: news@shlump.dec.com
Organization: Digital Equipment Corporation
Lines: 37

Current configuration:
A2000 (Rev 4.4 motherboard + 3.3K resistor on U604 which is Signetics)
2090A + 2 Seagate 412's in external box (~3' cables)
MEGABoard 2000 (2M)
A2300 (genlock)
Internal 3 1/2" floppy (DF1)
1.3 roms
WB 1.3 

Problem:
Using Quarterback (either 1.3 or 2.2) i never get past the 1st floppy.
It randomly fails with a 'bad floppy' requestor and asks for another.
At the time of failure the screen does something, ie jumps, flickers
or a few pixels change color (screen memory being changed by mistake?)
I don't have any other symptoms or strange happenings running any other
software.

Things i have tried:
 o DF0 and DF1 act the same
 o different floppies (formatted & unformatted SONY 2DD)
 o removed MEGABoard 2000 - no change
 o reseated 2090A and A2300 - no change
 o bypassed SETFASTMEM - no change
 o booted WB 1.3 from floppy - no change (mounted HD's by hand)
 o MRBackup works fine (altho about 1/3 of the background color
    changed at 1 point and remained changed)

I'm familiar with the 3.3K resistor fix (had to install it myself),
but am wondering if a better fix is to replace U604 and U605 with
non-Signetics chips (they are the only LS245's which are Signetics). I
can't get my hands on another A2000 for another week to sort it out by
swapping, so i'm open for suggestions.

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Mark Kaye	kaye@fscore.dec.com
Munster Hamlet, Ontario, Canada
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