yet another object (Unibus card?) to identify
pete at dunnington.plus.com
Thu Apr 2 15:58:53 CDT 2015
While sorting through some Unibus cards I've had on a dusty shelf for
years, I came across a strange card (picture at
It has no maker's name, but what looks like a zigzag triple S logo near
the centre of the top edge, and the legends "2010-60", "2010-6001 C835"
and "EM PC" next to that.
Apart from 74LS series, it has the following noteworthy ICs:
10 x Texas 74S2472 PROMs on left
4 x 20-pin and 1 x 16-pin ICs look like PALs at lower right
2 x 74LS181 (4-bit ALU) near the centre, with
2 x AMD 27S03 (16x4-bit bipolar RAM) and 4 x AM2907 (quad bus xcvr)
2 x white ceramic gold-top ICs 93L422-DC (256x4 static RAM)
2 x 7439 (marked "SEL"), 2 x DS8837, 5 x DS8641
12 x 75452 (high current high speed dual-NAND peripheral drivers)
and a 50-pin 3M IDC connector and a 2x15-way edge connector on the top edge.
Any suggestions as to what it is or who made it?
Being a hex-height card but having only CDEF fingers, it's the exception
that proves the rule that all Unibus hex cards have all six sets of
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