Q: Third-Party Unibus Memory Boards

Hi Gang: This morning I was sorting through a bunch of my spare Unibus cards, and noted that I have at least half a dozen RAM boards. These are all, to my knowledge, Unibus cards. These are not documented in the DEC Field Guide (thanks to Megan for her diligence in keeping it relatively current). In the short term I'd like to find out the characteristics of these cards, and their compatibility, in the longer term these 3rd party cards should be added to the Guide. Here's what I know: 1. Plessey Peripherals 705075-100 Rev B. Hex height card. 2. Standard Memories MM-140 PD Rev C4, also marked 102415-442 and stamped "20272" in large (3/8") white letters. Also a hex card. I have about 5 of the former, and 3-4 of the latter. My motivation for this exercise is to find a card that I can use to swap out the 128 KW RAM board on my (sick) 11/34A. This card is a M7891-DB, 128 KW 18 bit parity RAM. If either of these cards are similar in config (size < 128KW is irrelevant as I just want to see if I can get the machine to boot) then great, otherwise at least I can label the boards, and ask Megan to add them to the Field Guide. Thanks, Kevin -- Kevin McQuiggin VE7ZD mcquiggi(a)sfu.ca ---------- To unsubscribe (or subscribe) from (to) this list, send a message to info-pdp11-request(a)village.org, with the first line of the message body being "unsubscribe" or "subscribe", respectively (without the quotes).