At 10:19 PM 4/29/99 -0400, you wrote:
>
>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.
That's what I thought. It looks the codes are in octal since none of
them are greater than 7.
>
>> The second one is a core memory board that I *think* may be for a Data
>>General computer. I picked up several of these and they're all made by
>>Dataram Corporation and appear to date from 1972. Their part number is
>>3010290. I took the cover off of one. Man, the cores in these are tiny!
>
>They don't plug directly into a Nova's bus, at least. It's very likely
>that these core cards plugged into a dedicated array backplane - note
>the lack of bus interface circuitry near the edge connector, but obvious
>core drivers. The array backplane would've contained other card(s) forming
>the bus interface to the actual computer that used these core planes. If
>you can give us the X by Y count of the cores, and tell us if the
>cores are obviously divided into sections (12? 16? 18?), maybe we can
>make more WAG's about where it plugs into :-).
There are nine groups (3x3) each group has two sections. Each section
has 32 x 16 cores. That makes 9162 cores (3x3x2x16x32). They're on a
daughter board and there may be more on the bottom. Some of the cards are
marked in pencil "8K" and some are marked "16K".
Joe
>
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> Tim Shoppa Email: shoppa_at_trailing-edge.com
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Received on Fri Apr 30 1999 - 09:29:20 BST