[vcf-midatlantic] cranky 5150 - PART 2
stevenm at optonline.net
Sat Nov 5 17:05:24 EDT 2016
Uh oh. After writing the post below I read the appropriate minuszerodegrees
page, that suggested among other things, "Faulty motherboard - bad solder
joint on keyboard connector". So I took a look - here's what I found. Not
promising. But fixable! Does this look like the culprit? But what about
the memory errors?
From: Steven Michelsen [mailto:stevenm at optonline.net]
Sent: Saturday, November 05, 2016 4:55 PM
To: 'vcf-midatlantic' <vcf-midatlantic at lists.vintagecomputerfederation.org>
Subject: cranky 5150
I thought for once I could get a new IBM 5150 and NOT have to come crawling
to the group for advice, but noooo..
Just got an ebay 5150. I couldn't resist - it was relatively local, and
included a 5151 monitor (but no keyboard), for a decent price. I have a
keyboard, so no worries. Took the top off to peek inside to confirm
everything was seated, etc. I started it (with the top off) and got a
keyboard error (301). I discovered that my keyboard was set on AT instead
of XT. Flipped that switch and viola, the 5150 booted with a Dos 2.11 disk.
Poked around the disk, ran a Basic file that happened to be on it, tested
the "B" drive, formatted a disk - it's all good. I even booted a few times
with no issue.
I put the lid back on and started it again. This time I get this.
. and the PC is beeping away, long beeps that do not stop!
I restart again and get this.
This time there's no beeping, it just displays the msg. The disk drive was
read from briefly, then nothing.
I pull out what appears to be a memory expansion card. Here
's a picture of it. I started it without the card and get this.
I took another look at that RAM card and found THIS on the back
<https://dl.dropboxusercontent.com/u/65762317/forums/5150_bug.jpg> ! My PC
had a bug. Anyway, cleaning that up didn't help. I replaced the card,
started it and got yet another, different 40xx error.
OK, where do I go from here? The darn thing worked at one point today; why
not all the time? I have looked for unseated chips, cards and cables, as
least as far as I could without pulling a floppy drive, and found that
everything is secure.
Thanks as always,
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