170 (NORD-1 card)

170 Duplex buffer, is a card that is used in the NORD-1 CPU.

Component side.

Solder side.

Introduction

The card is made in the standard NORD-1 card format.

CPU model	Crate position
29	D30
35	D30

The logic diagram is documented in drawing 2A70.

In the NORD-1 Serial 47 the card is found in position E09 and marked with a sticker "MODEM". The D30 position is occupied by a 195 Duplex Start-stop buffer.

Switches and indicators

There is a trimmer on this board, function unknown.

BOM

This list contains the logic circuits used, passive components are not listed.

• 6 x 7400
• 2 x 7401
• 3 x 7403
• 4 x 7404
• 1 x 7410
• 1 x 7413
• 1 x 7474
• 4 x 7493
• 2 x 7494
• 2 x 7495
• 1 x MC889P RTL or DTL Hex inverter made by Motorola