90N40 (NORD-1 card)
90N40, is a card that is used in the NORD-1 CPU as glue logic There isn't any connections between the IC:s. It is built on the same board as 90N00, in this case it is populated with 7440 dual 4 input nand IC:s and one 7400 quad 2 input nand.
The card is made in the standard NORD-1 card format.
|CPU model||Crate position|
The logic diagram is documented in drawing 2B11.
Switches and indicators
There are no switches or indicators on this board.
This list contains the logic circuits used, passive components are not listed.
- 1 x 7400
- 2 x 7440
- HARDWARE MANUAL NORD 1
- Hardware in NORD-1 Serial 47