) (06/17/89)
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.
---
Mark Kaye kaye@fscore.dec.com
Munster Hamlet, Ontario, Canada
---) (06/18/89)
In article <3018@shlump.dec.com>, kaye@FSCORE.dec.com (Mark Kaye - He who dies with the most toys - is dead!) writes... >A2000 (Rev 4.4 motherboard + 3.3K resistor on U604 which is Signetics) ^^^^ Sorry to confuse the isssue here, the resistor is on U605, not U604 (i can't read silkscreening i guess). The 2 Signetics chips are U605 & U602. Also the memory chips in the MEGABoard are 120ns Hitachi devices. --- Mark Kaye kaye@fscore.dec.com Munster Hamlet, Ontario, Canada ---