15 Jul
2002
15 Jul
'02
3:17 p.m.
This does look like a Mark-8 that's been modified
(rather craftily) to use a plug backplane.
I'll bet the control socket on the front is where the
Front panel (or maybe EPROM or ROM or maybe even
diode?) board would go. Keep in mind that ROMs of any
kind were very expensive in 1974-6 for a home budget,
and no one had programmers.
There's a lot of glare on the 8008 CPU but I think
this is an example of a VERY early package (there are
at least 2 types of C8008 packages).
If you actually intend to get this going, I'd be
concerned about the Molex sockets. They are
constructed using PURE EVIL and were unreliable when
new. Judging from the chips utilized (some no-name
chips) and the sockets I suspect that this was built
by a very skilled hobbyist, probably an engineer or
senior technician working at home.
Also, definitely check that you have +5 and -9 on the
8008. You could damage it with one missing (and never
mind the 1101's).
Someone mentioned to me at the xtal on the mark-8 was
optional, and you might have an RC oscillator and
one-shots on there instead. The clock was 2-phase and
would require a scope to adjust so if you see pots
don't adjust them.
--- Andy Berg <groovelists(a)yahoo.com> wrote:
Hi! :)
Whelp... I actually lack total confidence as to what
it is. :\ The CPU board, at least looks like a
Mark-8
one. Alas, I don't have anything that looks like the
LED output board, but there also doesn't seem to be
a
slot for one. :(
I've popped some pictures up at:
http://66.30.18.171/MARK8/ - please forgive if it is
a
bit slow - 'tis on a cable modem. (I put it up under
MARK8, but I truly don't know. :( )
If something doesn't work, please don't hesitate to
toss a note this way!
--- Loboyko Steve <sloboyko(a)yahoo.com> wrote:
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And they say that there are no bargains on
eBay...bargains can be had by the patient and / or
lucky!
Are you SURE what you have isn't a SCELBI? (the 8
portsYour description sounds scelbi-like. Please
let
us know when pictures are up.
--- Jim Kearney <jim(a)jkearney.com> wrote:
> Rats! I had noted that auction, and was
planning
on
> bidding, but ended up
> being away from the computer for the last few
days
> of it.
>
> Anyway, if you need any help getting it running,
> drop me a line. I ended up
> with a pretty good knowledge of the design after
> debugging mine (recent
> construction, but original design).
>
> Jim
Thanks kindly for the offer. I truly, truly do
appreciate your kindness and intellectual generosity
-
it means a lot to me.
Thanks,
Andy
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