169 (NORD-1 card)
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169 Cambridge control, is a card that is used in the NORD-1 CPU.
It is a controller for interfacing the EXPANDARAM-18 core memory.
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Introduction
The card is made in the standard NORD-1 card format.
| CPU model | Crate position |
|---|---|
| 29 | |
| 35 | C31 |
The logic diagram is documented in drawing 2A69.[1]
Switches and indicators
There are no switches or indicators on this board, but there is a strap field on the front with an unknown function, probably to set the memory size.
BOM
This list contains the logic circuits used, passive components are not listed.
- 2 x 7400
- 1 x 7401
- 2 x 7402
- 5 x 7404
- 3 x 7410
- 2 x 7420
- 5 x 7440
- 1 x 7450
- 2 x 74107
- 1 x 74121
Reference
- ↑ HARDWARE MANUAL NORD 1
- Hardware in NORD-1 Serial 47