[vcf-midatlantic] cranky 5150 - first test results

[Steven Michelsen]

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 at lists.vintagecomputerfederation.org] On Behalf Of william degnan via vcf-midatlantic
Sent: Sunday, November 06, 2016 6:32 AM
To: vcf-midatlantic <vcf-midatlantic at lists.vintagecomputerfederation.org>
Cc: william degnan <billdegnan at 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 at 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 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.
>
>
>
> 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
>
>