3202

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ND 120 CPU board, component side.
ND 120 CPU board, solder side.

3202 is the ND-120 CPU board.

Introduction

It contains the CPU, bus arbitration logic, memory control, memory and other subsystems. It also has the Real time clock and the I/O for the serial console.

Switches and indicators

  • SW3 - Master Clear - normal position = central. This switch may be depressed to give a hardware master clear to the CPU.
  • TH1 - ALD select
  • TH2 - Baud rate select
  • LED3 - self test passed (green)
  • LED2 - self test fail (red)
  • LED1 - cache OFF (red)
  • SW1 - Cache ON, normal position = down.
  • LED6 - CPU grant (green)
  • LED7 - bus grant (yellow)
  • SW2 - Memory OFF, normal position = down.
  • LED4 - parity error (red)
  • LED5 - parity disable (red)
  • SW4 - Parity disable, normal position = down.
  • upper limit display
    • 000 - memory off (SW2)
    • 100 - 2M Bytes onboard memory
    • 200 - 4M Bytes onboard memory
    • 300 - 6M Bytes onboard memory

Connectors

The A and B connectors are used for I/O, the C connector is used for the ND-100 Bus.

I/O Devices on the card

none?

ECO

ECO or Engineering Change Order is a hardware change. Here is a list of known ECO's for this card.

  • ECO 100-779 - System failing with cache enabled[1]
  • ECO 100-785 - Memory out of range, IOX-error[1]
  • ECO X01 - New backup battery for the calendar on ND-120 CPU[1]

Reference

  1. 1.0 1.1 1.2 sintran.com, Norsk Data library, ECO [1]