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.

Component side.
Solder side.

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

  1. HARDWARE MANUAL NORD 1