1220Re: [midatlanticretro] Which version is it, Altair 680 or 680b ?
- Sep 4, 2005From July 1976 on I believe they were the "b's" If your board had 1975
printed on it then I would be more confident that is was a "non-b"
Another thing to check would be the monitor ROM, they were different in the
two models. You might be able to get the model by looking up that chip. If
you have BASIC for the 680, it may make mention in the documentation of the ROM
monitor required, and from there you can infer the model.
The main motherboard of the 680b will have a space at position L for a
"Baudot serial" chip, look for a chip with 74LS74 on it. If you have this, it's a
I have an SWTPc 6800 which is similar to the 680, but not exactly. The 680
used S-100 bus and the Altair has a A-50 (Altair custom 50) bus. You can load
programs from the SWTPc onto the 680 with minor modifications (I have been
In a message dated 9/3/2005 9:14:42 PM Eastern Standard Time,
> One thing I noticed after I took this part, the mainboard actually says
> MITS 1976
> 680 MAINBOARD REV 1-6x
> I hope somebody might be able to help identify this model. I'm thinking
> this is actually a 680 and not a 680b, am I right ?
- << Previous post in topic Next post in topic >>