169 (NORD-1 card)

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169 Cambridge control, is a card that is used in the NORD-1 CPU.

Component side.
Solder side.

It is a controller for interfacing the EXPANDARAM-18 core memory.

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 2A59.[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

  1. HARDWARE MANUAL NORD 1