DEC DSSI board? Maybe?

[Tom Peters]

What is it?

I have an unidentified board, approx 3.75 inches by 4, or about 94mm x 104mm.

It says on the silkscreen, "DSSI DAUGHTER CARD" and "50-21836-01 B1" 
There's about 4 chips on it, and some SMD caps & resistors and a big 
honkin' diode.

The main chip has something like 200 pins, on all four sides of the chip, 
soldered to the component side of the board, and sporting a tower-style 
heat sink apparently cemented to the top of the chip.

There's also 3 each 10-pin SIP resistors next to each other, like 
termination r's. And three each 2-pin jumpers marked "4 2 1" - addressing, 
obviously. All three are in place = 7.

The two main connectors are a black D-shaped one that makes me thing of 
SCSI SCA, with 50 pins. The other is a blue Berg-style, I'm guessing for an 
IDC connector on the end of a ribbon cable. The pins that are marked on the 
board say "1" and "49" so I'm going to say 50 pins as well, with locking 
ears you close to seat the cable and lock it in place.

It was in a Digital Equipment Corp shipping box, one that looks to be the 
right width for the board but probably twice as long as it needed to be. It 
was in a static bag- the original, from the looks of it. The grainy 
photograph on the box doesn't match the board.

It's in perfect shape. On the box someone has scrawled "Single DSSI 
controller for 4000's"

Worth anything to anyone?





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