90N40 (NORD-1 card)
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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.
Introduction
The card is made in the standard NORD-1 card format.
| CPU model | Crate position |
|---|---|
| 29 | D06, D07 |
| 35 | D06, D07 |
The logic diagram is documented in drawing 2B11.[1]
Switches and indicators
There are no switches or indicators on this board.
BOM
This list contains the logic circuits used, passive components are not listed.
- 1 x 7400
- 2 x 7440
Reference
- ↑ HARDWARE MANUAL NORD 1
- Hardware in NORD-1 Serial 47