25 Mar
2002
25 Mar
'02
11:36 p.m.
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(a)ix.netcom.com>
To: "Classic Computers" <classiccmp(a)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(a)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(a)watermarkpress.com
"Life. Don't talk to me about life." - Marvin, the android