There are actually three boards I need to ID, the third is possibly a tape
controller. Here's the rundown:
#1 A Q-bus dual width board made by DTC. Has a 50-pin header next to a
single ejector handle. All TTL chips, no LSI or CMOS devices. Two 8-section
DIP switches on board. Only markings are a FAB, ASSY, REV and S/N numbers.
The ASSY number is 007-00002.
Could this be a Q-bus SCSI board (I hope, I hope, I hope)? But there's no
CPU or ASIC, etc. onboard to handle DMA, SCSI device protocoll, etc. :( An
appropriate driver in conjunction with the OS would have to do this.
#2 A Q-bus quad width board of unknown manufacture. Two 50-pin headers at
handle-edge of board. A marking on the component side says it's a "Q
BUS/LEXID INT." with a number 77D609871P1 under it. A number stamped on the
backside is "GE77D609871G1" with "SER NO- 44" under it. Those part numbers
look like old GE part numbers. Did General Electric make any equipment for
the DEC world?
#3 This is what I feel is an Archive tape controller. It has "ARCHIVE
CORP. Copyright 1983" silk screened onto the component side. No other
numbers on the silk screen, dang it. It is 5.5" x 7.75" with a 50-pin edge
connector (marked "J1") on one 5.5" end and a 50-pin header (marked "J3")
at the other end. "J2" is a 4-pin recepticle which is the same as the power
connector on a 5.25" floppy or hard drive and is on the edge connector-end
of the board. The EPROM label has 80182-010 on it. Has an 8031
microcontroller chip, an 8155 and an Archive LCC ASIC plus a bunch of TTL
and one small CMOS RAM chip (Mitsubishi M5M2167P-70). Other numbers found
on the board seem to be component part numbers however there is a
hand-written number on the solder side which is 80158-013/A. Could this be
an important identifying number?
I want to try to identify these boards to see if theyt are useable in the
systems I'm keeping, especially item #1.
Thanks for the help.
--Chris
-- --
Christian Fandt, Electronic/Electrical Historian
Jamestown, NY USA
Member of Antique Wireless Association
URL: http://www.ggw.org/freenet/a/awa/
Due to popular demand, I have finally gotten around to
adding the DIGI-COMP 1 Assembly Instructions to the
collection of other scanned DIGI-COMP 1 manual pages at
http://galena.tjs.org/digicomp/ . They are all 300 DPI
grayscale images - in other words, huge! The parts list
alone (Page 1) should be immensely helpful for those
wishing to create their own DIGI-COMP.
Thanks to everyone who e-mailed me over the past few
days!
Tom
--
This account is used so mailing lists don't
clutter up Tom's real account. If you really
want to talk to Tom, use tom(at)galena.tjs.org
I live in Union County NJ. Are there any good old computer sources
around here???
Mike
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
After a little research, I figured out how to rebuild a MacPortable
battery pack for about 1/3 the cost of buying one on the resale market (I've
seen prices between $60 and $75 per battery).
Anyway, the pack is rated at 6v/5ah, and contains three, 2v/5ah Gates
Cyclon "X" cells. The X cells are two sizes above the conventional D
battery. Gates no longer makes these batteries, having gotten out of the
battery business. Hawker Energy Products (http://www.hepi.com) now makes
these cells.
These are available from Battery Specialties (1-800-854-5759) for $7.24
each ($21.72 total).
Opening the battery case is also easy. The pack top is ultrasonically
welded to the bottom case, but if you score the top plastic in the groove
where it meets the bottom case, and then bang it with a small slot-headed
screwdriver and a hammer, you can open it easily.
Replace the internal cells with the new ones, observing all polarity
markings and ensuring that all insulating plastic and foam pieces are
replaced. You can then seal it with plastic welding cement such as X7.
The only problem that I can see is creating the bars that join the
cells. I'll probably use 12g copper wire in stead of bus bars.
Now all I need is the batteries...
Rich Cini/WUGNET <nospam_rcini(a)msn.com>
- ClubWin! Charter Member
- MCP Windows 95/Windows Networking
- Preserver of "classic" computers
<<<< ========== reply separator ========== >>>>>
One of my recent curbside finds is a machine put out by a Canadian company
based in Waterloo Ont called Volker-Craig model vg-400. On the front it has a
title VC404 The Standard. It has a k-b attached with ribbon cable which is
about the size of a C64 with Function Pf1-12 buttons as well as a separate
pod with APL,PAGE,FULL,LOCAL on the left vertically. There is a full
qwerty alphabet and numerical pad as well as some specialized keys the most
unusual of which is a key labelled "rub-out" and no down arrow. In the back it
has a 25 pin RS232 connector, a BNC labelled "composite video" ,2 switches :
one 3-pos.to configure parity the other "Transparent on off" It also has
cutouts for parallell and serial (maybe a 9pin dshell for different modems)
I haven't opened it up yet, and I must admit to doing what the impeccable
Tony Duell would deem unforgiveable (sorry Tony, Couldn't he'p m'se'f)
I plugged it in and tuned it on. It worked except for a stuck k-b which
stopped printing to screen when I punched another key than local on the
right-most pad.
Obviosly a terminal of some sort, but the keypads are not what I would expect.
My guess is it's a terminal for the deaf which hooked up to a service. But why
all the other k-b functions. Any ideas ?
ciao larry
lwalker(a)interlog.com
Well... I finally found one, I ordered a used Imsai 8080 from an
undisclosed place in CA (they had one on consignment) and they're
shipping it to me here in Boston.
Thanks to those on the list who gave me pointers on how to find one.
Now I gotta order replacement switches for the front panel (Tony heads
to his web browser)
Tony
< 2) DISCONNECT THE FRONT PANEL AC SWITCH!!! Put an on/off power switch
< in the back, use a hole next to the fan (most back plates had one.
< Don't run the AC power through the front panel.
This one applies to Altair8800s BIGTIME and any others that has mains ac
near logic. The designers that did that should be made to stand in a
puddle and work on it!
Allison
Not so easy, you would have to grind down the back spacers so the front
panel stayed in alignment with the bus slot. Just adding the ring would
push the panel card forward.
Jack
>Don't know how they are but I can guess - has anyone tried puuting the
screws in, then the spacers, then putting a C or E ring on the screw as
a keeper to make it a captive screw and spacer?
> Well... I finally found one, I ordered a used Imsai 8080 from an
> undisclosed place in CA (they had one on consignment) and they're
> shipping it to me here in Boston.
Advice to a new IMSAI owner:
1) if you take the front panel off, tape the plastic sandwich with the
film for the front panel logo so it doesn't come apart. Also, tape the
allen head screws on so they don't come out. This is real handy when
the time comes to reassemble. You will discover you need 4 hands to do
it: one to hold panel, one to position screws, one to hold spacers in
back, one to tighten screws.
2) DISCONNECT THE FRONT PANEL AC SWITCH!!! Put an on/off power switch
in the back, use a hole next to the fan (most back plates had one.
Don't run the AC power through the front panel.
3) If its been heavily used, chances are the bus connectors may be worn.
Wiggle cards a bit when STOPed and see if status lights change. You
might have to hunt for the least worn slots.
4) Look for purple plague. If it's old, the socketed IC pins or card
edge connectors may have oxidation (usually purple or black
discoloration). You may need to check the front panel for this if it's
socketed.
5) Check the +8, +/-16, and GND pins on the bus connectors before
powering up, make sure nothing's shorted.
Jack Peacock
Using IMSAIs since 1975
Hi,
So can any of you recommend a good book on how transputers work in a
broad sense? I occasionally have the urge to take all the old PC system
boards lying around and construct some form of transputer system - ok,
so it's impractical, would be a lot of work, and wouldn't be of any
benefit at all, but it would be an interesting exercise :)
(so I'm crazy... just seems a shame that I've got various system boards
lying around unused that can't be made into complete machines and are of
no use to anyone else...)
Jules
>