1108RE: [midatlanticretro] Altair serial port problems
- Aug 7, 2005Bill:
I appreciate the offer. Like you, I'm a persistent tester. Herb
Johnson has given me some ideas to try. Unfortunately I don't have a
real terminal but my fear, based on the circuit design, is that current
serial ports don't usually put out +/-12v and that fact might be
dropping the input voltage at the SIO board below the detection level. I
don't have a "real" terminal but as you indicate, I might have to use
[mailto:firstname.lastname@example.org] On Behalf Of billdeg@...
Sent: Sunday, August 07, 2005 10:56 AM
Subject: Re: [midatlanticretro] Altair serial port problems
I do have a 8800b with 48 K memory.
Sounds like you have been working hard on this project and I may not be
to offer much help, but here are my thoughts. Do you have a Fluke data
analyzer using an 8080 pod to review the serial port traffic? I am not
how to use a Fluke data analyzer with an 8080 pod myself, but I know
is a good way to test an 8080 machine using the serial port. You can
the two serial cards this way, see if there are differences. You can
confirm the byte structure is what your emulator wants. It's very
have done something like this already.
I seem to remember that there are ways to change settings on my serial
for data transfer structure and baud rate. It might be worth cycling
Have you tried a "real" terminal? I have found that the older terminals
better than Windows terminal emulators. When working on an SWTPC 6800 I
could not get it to work properly until I tried a Zenith z-cn-19, set at
I may be way off - I am not an engineer. I am more of a persistent
If you're really stuck and want to cart your 8800b over to my house
of Delaware/MD/PA) you can use my 8800b to compare with yours. I could
lot from your experiences with the Altair as well. I also have an IMSAI
and a 8800b-T
In a message dated 8/6/2005 10:39:04 PM Eastern Standard Time,
> So, here's the question: does anyone in this group have aYahoo! Groups Links
> known-working SSM configuration and known-working program that I can
> compare to what I have? I'm looking to compare jumper settings, cable
> wiring and software -- everything. A solution is here but I'm not
> seeing it yet. I'm also going to write a short Windows-based "paper
> tape" emulator instead of trying to use the upload command of
> Procomm. I think that something is getting messed up with that.
> Thoughts? Thanks.
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