Okay, I have it all dialed in now!
With that iffy memory board swapped out, the system works beautifully. I
did have some trouble loading Altair BASIC but after looking at a video of
someone running it I discovered an extra line that appeared to be in the
Altair patch file and also a couple o
On Wednesday (09/07/2016 at 08:04AM -0700), Brad H wrote:
>
> Thanks Chris. I figured it was something like that with my first MP-M. I am
> curious though why simply setting another board to cover 8000-BFFF won't
> allow the system to operate in that board's absence. It bothers me that I'm
>
Ahhh.. okay, maybe I misunderstood. I was reading '4096 words of 8 bit RAM', I
don't know 'words' that well so I put it in a calculator and it was telling me
it was 8K. But docs suggested the original MP-M came with 2k. So setting the
board # jumper to 4, if it was at 2K, would run $4000 to $
-Original Message-
From: Chris Elmquist [mailto:chr...@pobox.com]
Sent: Wednesday, September 7, 2016 6:13 AM
To: General Discussion: On-Topic and Off-Topic Posts ;
Brad H ; 'General Discussion: On-Topic and
Off-Topic Posts'
Subject: RE: SWTPC 6800 weirdness
Both MIKBUG
---Original Message-
>From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of
>william degnan
>Sent: Tuesday, September 6, 2016 2:52 PM
>To: General Discussion: On-Topic and Off-Topic Posts
>
>Subject: Re: SWTPC 6800 weirdness
>
>>
>>
>> >
>>
Okay I think I'm starting to figure this out a bit. Beginning with basics, I
cleaned up the contacts on all the SS50 pins. The system seems to power up
more reliably now. Next, I poked around in the monitor to figure out exactly
which addresses the modified MP-M board was dealing with. Since
I don't have the right caps to try with the MP-M so I'll have to wait. But I
did try again setting my DRC boards to A000. And when the machine is turned
on, it does respond, but it just produces garbage characters on the terminal.
Sometimes, two, sometimes three, or a whole line of them.
I
I did a capacitor check on the modified MP-M board. On the 100uf/16v one down
at the bottom center, the most I get is 430uf and then it starts dropping. I
can't seem to get a proper reading out of the same one on the upper right..
that's the same on both MP-M boards. So I'm wondering if I'd
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of william degnan
Sent: Tuesday, September 6, 2016 2:52 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: SWTPC 6800 weirdness
>
>
> >
> >
> >Brad,
> >
>
>
> >
> >
> >Brad,
> >You'll need to make electrical measurements, from the system checkout in
> >the manual. You very possibly will have marginal components that need to
> >be replaced, but it's best to try to locate which is bad rather that to
> replace at random.
>
> >A000 is not the same pl
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of william degnan
Sent: Tuesday, September 6, 2016 11:37 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: SWTPC 6800 weirdness
On Tue, Sep 6, 2016 at 2:25 PM, Brad H
wrote:
> My 6
-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Fred Cisin
Sent: Tuesday, September 6, 2016 11:36 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: SWTPC 6800 weirdness
On Tue, 6 Sep 2016, Brad H wrote:
> My 6800 has been mos
On Tue, Sep 6, 2016 at 2:25 PM, Brad H
wrote:
> My 6800 has been mostly working, but it seems to be occasionally flaking
> out. I don't know why. Sometimes you go to power it up, and there's no
> response on terminal side. The 'fix' is sometimes to wiggle the memory/CPU
> boards and then for s
On Tue, 6 Sep 2016, Brad H wrote:
My 6800 has been mostly working, but it seems to be occasionally flaking
out. I don't know why. Sometimes you go to power it up, and there's no
response on terminal side. The 'fix' is sometimes to wiggle the memory/CPU
boards and then for some reason it's fine
My 6800 has been mostly working, but it seems to be occasionally flaking
out. I don't know why. Sometimes you go to power it up, and there's no
response on terminal side. The 'fix' is sometimes to wiggle the memory/CPU
boards and then for some reason it's fine(ish). There are five cards
install
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