This board is a dual flip flop where each flip flop stores 1 bit of information. This is somewhat similar to the TTL 7473 dual J-K flip flop. It has a set and reset input and a gated set and reset. Without additional gating you can perform the following operations.
- Up counter with load
- Shift register with parallel load
- Ring counter
- Down counter
- BCD counter
This board cost $22 in 1968.
Schematic of board as a scanned PDF file.
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 documentation.
PDP-8 Home Page  PDP-8 Site Map  PDP-8 Site Search