On 28 Jun 1998, Frank McConnell wrote:
> A couple of weeks ago someone thrust this bag into my hands and
> suggested that I find out about it. In the finest tradition of
> getting the 'net to do my homework for me, I did a few web searches
> that gave me a lot of false leads and no real info, and now I'm
> pestering y'all.
>
> So what's in the bag? It's a Z80 singleboard, 4 15/16" x 6 3/4"
> (12.6cm x 17.1 cm for you metric-threaded folks). Legends in the
> component-side traces include an "EXO corporation" logo, "(C) 1982"
> (where (C) is the C-in-circle copyright symbol), and "1010A" which I
> guess is a part or model number. There's a terminal strip off to one
> side which I am guessing (from the ICs and a little bit of
> follow-the-traces that is about the limit of my know-how) is intended
> to be connections for power, interrupt lines, and a serial port. And
> there are three 34-pin (2x17) plugs in about the middle of the board.
>
> Significant ICs would seem to be an SGS Z80A, a National 2716 EPROM,
> nine Hitachi HM4864P-2, Zilog Z8410A (DMA) and Z8440A (SIO/O),
> National MC1489P and two TI SN101057 on the way to that terminal
> strip, and a couple of what I guess are some sort of programmable
> logic in 20-pin DIPs whose markings have been removed so that "(C)
> 1981... EXO SYS. CORP." can be stamped on top.
>
> Anybody know what this is, or anything about the company, or any
> better places to look? I'm guessing "singleboard for control system"
> but that is pretty much outside my know-how.
There was an EXO CP/M computer way back, but it used 8" drives and I
doubt that your board went with them :) Could be tha same company,
though.
- don
> And how did I get into this fix? I suspect it's karmic payback for
> something I said a couple hours before at the Foothill swap meet.
> Someone showed me a 68000 singleboard (not too different) and I said
> something like "once upon a time I'd have found that a really neat
> hacker toy, now I don't think I have time for it." There's clues in
> here somewhere, but I don't think I've figured out which ones I'm
> supposed to pay attention to.
>
> -Frank McConnell
>
donm_at_cts.com
*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
Chairman, Dina-SIG of the San Diego Computer Society
Clinging tenaciously to the trailing edge of technology.
Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
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see old system support at
http://www.psyber.com/~tcj
visit the "Unofficial" CP/M Web site at
http://cdl.uta.edu/cpm
with Mirror at
http://www.mathcs.emory.edu/~cfs/cpm
Received on Sun Jun 28 1998 - 22:33:19 BST