An 8-bit system can't be that much of a problem, unless those 16-pin devices
you mention are PROMs of some sort, used as decoders or the like. He may
think it's a massive amount of work, but it's really not, since there are only
16 bits of address and knowing the device type of the memories will easily
cover 10 or 12 of them, leaving only a couple of decoders or the equivalent in
SSI. I'd be surprised if it takes more than an hour to buzz out the memory
map. There is no I/O space, so that's in the memory map also.
Dick
----- Original Message -----
From: "tim lindner" <tlindner_at_ix.netcom.com>
To: "Classic Computers" <classiccmp_at_classiccmp.org>
Sent: Monday, March 25, 2002 11:02 PM
Subject: 6800 System - Schematic Needed
> I saw this over on comp.sys.m6809. I was hopng someone here could help
> this guy.
>
> Begin message:
>
> > From: Mike <ipscone555_at_msdsite.com>
> >
> > I know this is a long shot but I have a nice 6800 based single board
> > computer, with keypad and LED display. It is mounted in a 2 slot
> > chassis that has a smoked glass cover and wood sidings.
> >
> > It's very nice and works well. Problem is that I don't have a
> > schematic and don't know how the memory and I/O are mapped. It also
> > has a couple of 16 pin devices that are not installed. I guess I can
> > buz it out and figure out what is there but that is a massive amount
> > of work
> >
> > The system is marked: ASCI u68, System-X.
> >
> > I have tried an internet search but can't find anything on it. I
> > think it was used in a class for learning microprocessors back in late
> > 70s.
> >
> > Anyone have any leads on were I might find a schematic?
> >
> > photos a: http://www.msdsite.com/comp/u68.html
> >
> > Thanks,
> > Remove 555 from email to email an answer.
>
>
> --
> tim lindner tlindner_at_watermarkpress.com
>
> "Life. Don't talk to me about life." - Marvin, the android
>
>
Received on Tue Mar 26 2002 - 07:36:00 GMT