29 Apr
1999
29 Apr
'99
2:24 p.m.
> I went scrounging today and found some
interesting cards. A picture of
>the first one is at "http://www.intellistar.net/~rigdonj/card1.jpg" and a
>picture of the second is at "http://www.intellistar.net/~rigdonj/card2.jpg".
> The first one is interesting because it has a list on the right side that
>appears to be a list of memory locations and op codes. It's hard to see in
>the photo but the first column is labeled CNT. (count?). Most of the ICs
>are dated 1972. The only other markings on the card is "TERADYNE A 794" and
>"Made in USA".
Looks like a ROM built out of a diode array. I'd
make a WAG that it's
a bootstrap for some computer, but I don't know what. Judging by the
content list, I'd say it's a 18-bit computer of some sort, but I don't
recognize the board form factor or the opcodes.
Further insight: if you count the number of instructions listed that
have the low bit set, then count the diodes in the B01 region on the board,
they match up. And so on. Lots of zeroes in this particular opcode
set, whatever it is!
Tim.