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Connector A is mostly used for the user to interface with the system, although some extra unexposed signals also exists. Out of interest, the majority of the connector is used as follows:
Connector A is mostly used for the user to interface with the system, although some extra unexposed signals also exists. Out of interest, the majority of the connector is used as follows:


* Aa07-Aa12 and Ac07-Ac12 goes to the [[Console Terminal]] female DB-25 connector, pins 15-20 and 2-7 respectively.
* Aa07-Aa12 and Ac07-Ac12 goes to the [[Console terminal]] female DB-25 connector, pins 15-20 and 2-7 respectively.
* Aa13-Aa32 and Ac13-Ac32 goes to the [[NS-100 front panel]] connector, pins 39-1 (odd) and 40-2 (even) respectively.
* Aa13-Aa32 and Ac13-Ac32 goes to the [[ND-100 front panel]] connector, pins 39-1 (odd) and 40-2 (even) respectively.


Connector B connects to the memory management module in slot 2, as well as the tracer module if needed for debugging. This is also where an optional PROM with a CPU serial-number would go.
Connector B connects to the memory management module in slot 2, as well as the tracer module if needed for debugging. This is also where an optional PROM with a CPU serial-number would go.

Revision as of 17:51, 13 April 2026

ND-100 CPU with CX option

3033 is the ND-100 CPU with CX option board. It contains the CPU, bus arbitration logic, memory control and other subsystems. It also has the Real time clock and the I/O for the serial console.

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Introduction

Switches and indicators

As seen from the top, when the card is in the card crate (components on the right hand side). 

console speed thumbwheel switch
ALD thumbwheel switch
green LED - cpu self test ok
red LED - cpu self test not ok

Console speed setting

  • 0 - 110 baud
  • 1 - 150 baud
  • 2 - 300 baud
  • 3 - 2400 baud
  • 4 - 1200 baud
  • 5 - 1800 baud
  • 6 - 4800 baud
  • 7 - 9600 baud
  • 8 - 2400 baud
  • 9 - 600 baud
  • 10 - 200 baud
  • 11 - 134.5 baud
  • 12 - 75 baud
  • 13 - 50 baud

Setting 14 and 15 is not defined (not used?).

Connectors

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

Connector A is mostly used for the user to interface with the system, although some extra unexposed signals also exists. Out of interest, the majority of the connector is used as follows:

  • Aa07-Aa12 and Ac07-Ac12 goes to the Console terminal female DB-25 connector, pins 15-20 and 2-7 respectively.
  • Aa13-Aa32 and Ac13-Ac32 goes to the ND-100 front panel connector, pins 39-1 (odd) and 40-2 (even) respectively.

Connector B connects to the memory management module in slot 2, as well as the tracer module if needed for debugging. This is also where an optional PROM with a CPU serial-number would go.

I/O Devices on the card

The real time clock (device numbers 10 - 13) is always located on the CPU board. The terminal (Terminal 1) with device number 300 (octal) is located on the CPU board, unless a strap on the CPU board is removed.

Current Loop interface

The current loop interface (AKA Terminal 1 AKA console), located on the CPU board, has device number 300. The device register address range is 300 - 307.

Real-Time Clock

The real-time clock on the CPU board has device number 10. The device register address range is 10 - 13.

Reference

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