"misc pc boards" found

From: der Mouse <mouse_at_Rodents.Montreal.QC.CA>
Date: Sun Dec 5 04:38:22 2004

I was going through various miscellaney and found a box labeled
"MISC PC BOARDS". On opening it up, I found a number of boards which
may of interest to the list. With one possible exception, they are all
up for grabs, on the same conditions as my last pile of stuff: cover
shipping and it's yours (including free if you pick it up in Montreal).
Except where noted, this is all "no obvious physical damage, but
completely untested and has been sitting idle for some unknown number
of years, probably at least ten".

First, the board I suspect I want to keep - I have some questions about
it, if anyone can answer them.

It's apparently from an outfit called MICRO WORKS, and is a "2708 EPROM
BURNER". It has onboard a 6821, two 7474s, a 7406, a 555, a 7805, a
7904, a 7812, a 3904 transistor, various two-terminal devices (caps,
resistors, diodes, a LED), and a switch (apparently SPDT used as SPST)
marked "HV OFF" and "HV ON". Oh, and a rather nice 24-pin ZIF DIP
socket. It has a card-edge connector that makes it look as though it
goes with the SwTPc stuff listed below - its only 30-pin, but has the
same pin pitch and blocked pin.

Basically, what I want to know is, how much hackery would it take to
turn this into something I could attach to, say, a parallel port, and
use to burn EPROMs?

Next, the stuff that's definitely up for grabs.

Of these, to start, four Wang boards:

A board in the shape of a rectangle about 20"x13" with a rectangle of
about 12"x5" cut out of one corner - or, equivalently, a rectangle of
20"x8" overlapped with a rectangle of 8"x13" (where in all four cases
the dimensions are in the same order). On the 12" edge there is a
connector that looks physically like a 3U VME connector to my (not very
used to VME) eye. On the 8" edge there is a DB25F, what I might call
(quite possibly improperly) a DIN-4, and a 36-pin Centronics. At the
end of the 20" edge farthest from the 8" edge, there are two 34-pin
(17x2) 0.1"-pitch connectors of the sort I learned to call Bergs.
According to the solder side, this is an "8221-R2" and bears the Wang
name; on the component side, I also see the Wang logo and the markings
"8221- -R2M2", where the number 14, or perhaps the letter A, has been
hand-written into the gap, and the last 2 is in a different font from
the rest. Following that is a box into which has been handwritten
J05796. Silkscreened - not part of the foil pattern - I see
"CPU/SYSTEM BOARD" and "8221-R1 SILK SCREEN". There is one empty
socket, a 40-pin DIP; the other seven sockets are filled. Based on the
datecodes I see on the soldered-in chips, this dates from mid-'82.

A board which I speculate is a backplane to go with the previous board.
It bears no active components, only connectors and resistors. It has a
connector physically compatible with the VME-like connector on the
above board, five 86-conductor card-edge connectors (43 pins on each
side, with approximately S-100 pin spacing), and three connectors that
look like power connectors: one each of five, three, and two pins. In
the foil patterns on the compoent side, this is marked
        COMP. SIDE 8241- -R?M
and the Wang logo (where ? may actually be intended to be a 0). In the
foil on the solder side I see the Wang logo and
This baord is about 6"x7".

Another Wang board. This one is about 8"x12" and has two card-edge
connectors, one physically compatible with the 86-pin connectors on the
previous board and one 20-pin one with much narrower spacing on the
other edge. It has what appears to be a back-panel connector with a
metal shield on the 8" edge (which is not included in the 12" dimension
- it adds maybe 5/8") bearing a DA15F connector. This baord is marked
"8223- -R?M" on the component side and "8223-R?" on the foil side, and
has numerous patches applied in the form of etch run cuts and
soldered-on wires. Almost everything is soldered in, but there is one
socket, bearing a crystal oscillator marked "19.200 MHZ".

Another board which looks very much like 8241 board above which I
speculated was a backplane, except that instead of the VMEish connector
it has a sixth 86-pin card-edge connector. It is marked as 8229
instead of 8241, but otherwise looks basically identical to the 8241
described above.

Three boards which I expect are from an SwTPc. Each bears the SwTPc
logo somewhere in the component-side etch.

One I feel sure is a CPU board. It bears many DIPs, all socketed (and
all sockets populated), a 7805 and four discrete transistors or similar
devices soldered in, and miscellanous two-terminal devices (resistors,
caps, a crystal, maybe some others I don't recognize). The "big chip"
is an MC6800P; I also see an HM46810P, an MC14411P, and a chip labeled
with the motorola logo and the text "SWTBUG 1.0" and a "7748" which I
imagine is a datecode. Everything else is in the 8- to 20-pin range.
On the card edge is a 50-pin single-row connector with slightly over
2.5 pins to the centimetre, with one pin space filled with plastic.

A board with 39 empty DIP sockets (mostly 16-pin, at least one 14-pin),
no filled sockets, and two 7805s apparently connected in parallel.
Next to the SwTPc logo is the text "MP-M". I suspect the 7805s are
intended to have heatsinks which the board has been robbed of, probably
at the same time as the socketed chips were removed. This has a
card-edge connector apparently identical to that on the CPU board (just

A board which I feel sure is memory. It's marked "MP-8M2" and has a
SPDT switch with the positions marked "WRT. PROTECT" and "NORMAL"; next
to one row of 8 DIPs is "UPPER 4K" and next to another is "LOWER 4K".
It also has two 7805s, each driving power to some of the chips - their
outputs aren't wired together. There is also a DIP bank of four

Finally, two miscellaneous boards.

One I suspect of being an S-100 prototyping board. It has a 7805 and
numerous power decoupling caps, a lot of uncomitted solder pads, and a
100-pin card-edge connector that looks like S-100 to my inexperienced
eye. It is silk-screen labeled "CROMEMCO WRAP BOARD" on the component
side and "CROMEMCO WWB-2" on the solder side.

The other is a mystery to me. It looks like a module from a very early
modular computer of some sort. It dates from the very early IC days, I
would say - the days when an IC package would contain maybe five to ten
transistors and not much else. It bears a logo that consists of the
letters A and M, stacked with the A over the M, inside an octagon whose
vertices are at (cos(k*pi/4),sin(k*pi/4)) - ie, turned 22.5? relative
to stop-sign orientation. It has been robbed of one component, a
transistor to go by the labeling ("Q5" on the component side), but I
think everything else is present.

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Received on Sun Dec 05 2004 - 04:38:22 GMT

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