You have a short in the motherboard, the roms are loose, stuff like that. Reduce to minimum RAM by removing from my all except what you need. Verify jumpers, if you remove drive controller you have to change jumpers to no drives setting. Bill Degnan twitter: billdeg vintagecomputer.net On Nov 6, 2016 11:25 AM, "Steven Michelsen via vcf-midatlantic" < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
FYI my mobo is a 64k-256k board, and the PC serial # is 11483445150.
OK I did the test as outlined below:
- I pulled the ram card and floppy controller card, leaving only the video card. - I changed switch 3 and 4 on block SW1 to ON, for "bank 0 only"
I did the test twice, and got different results:
TRY #1: Got a "4090" code, and the PC produced long beeps that did not stop.
TRY #2 Got the following codes, AND THEN the PC booted to Basic.
4098 201 601
What do you make of all this? And, why would the same test yield different results?
Thanks much, Steve
-----Original Message----- From: vcf-midatlantic [mailto:vcf-midatlantic-bounces@lists. vintagecomputerfederation.org] On Behalf Of william degnan via vcf-midatlantic Sent: Sunday, November 06, 2016 6:32 AM To: vcf-midatlantic <vcf-midatlantic@lists.vintagecomputerfederation.org> Cc: william degnan <billdegnan@gmail.com> Subject: Re: [vcf-midatlantic] cranky 5150 - PART 2
Set the MOBO to minimum RAM, remove all but video controller report result
Bill Degnan twitter: billdeg vintagecomputer.net On Nov 5, 2016 5:05 PM, "Steven Michelsen via vcf-midatlantic" < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
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?
https://www.youtube.com/watch?v=3A9uULoyJgk
From: Steven Michelsen [mailto:stevenm@optonline.net] Sent: Saturday, November 05, 2016 4:55 PM To: 'vcf-midatlantic' <vcf-midatlantic@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.
40FF
. and the PC is beeping away, long beeps that do not stop!
I restart again and get this.
40FF
201 301
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 <https://dl.dropboxusercontent.com/u/65762317/forums/IBM_5150_RAM_ board.jpg> 's a picture of it. I started it without the card and get this.
40D0
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,
Steve