This is one of several cards which had repairs. If you look at the middle left you will see flux residue and larger solder balls where components were replaced. The card is a R211 which is a single bit of the Memory Address (MA) Memory Buffer (MB) Program Counter (PC) register card.
Feel free to contact me, David Gesswein firstname.lastname@example.org
with any questions, comments on the web site, or if you have related equipment,
documentation, software etc. you are willing to part with. I am
interested in anything PDP-8
related, computers, peripherals used with them, DEC or third party, or