Development DECSYSTEM-20 and HSC50 disk subsystem in lab on MRO1-2 (Digital Equipment Corporation Marlboro plant). I don't think this was KL2102 or KL2137. Note that the note at middle left is written on the back of a punch card, even at DEC in 1984 (I wouldn't have been able to tell you where a card reader or a keypunch were when I worked there).
DECSYSTEM-20; HSC50
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From: Phil Budne
Date: Thu Oct 26 07:10:35 2006
Punch cards were used to mark pages of the TOPS-10 lists where edits had been hand written in(!!) I seem to recall having heard the supply of punch cards came from the machine that wire wrapped the KI-10 backplane.
From: John Francini
Date: Sun May 4 19:12:02 2008
well, it *might* be 2102 or 2137 given that the disk pack immediately in front of it is SNARK:, where the TOPS-20 sources lived if memory serves.