3104

ND-100 card 3104B MEMORY MANAGEMENT 2, component side

ND-100 card 3104B MEMORY MANAGEMENT 2, solder side

3104 is the Memory Management II unit.

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Introduction

Memory Management unit for ND-100 machines.

Options

• No cache
• Cache installed

Typically the no-cache option would be paired with the Slow option of the 3033 CPU, according to the ND-100 reference manual.

Connectors

In general, the 3104 MMS is designed to work together with the 3033 CPU, and it also expects to be hooked up to the display section of the ND-100 front panel. All three ports are used for various of these tasks.

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. This is driven entirely by the CPU, and not used by the MMS.
• Aa13-Aa32 and Ac13-Ac32 goes to the ND-100 front panel control panel connector, pins 39-1 (odd) and 40-2 (even) respectively.

Connector B connects to the CPU module in slot 1, 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 C is used for the ND-100 Bus.

I/O Devices on the card

none?

Reference

• Norsk Data Document ND–06.015.02 ND-100 FUNCTIONAL DESCRIPTION
• Norsk Data Document ND–30.008.3 EN ND-100 Hardware Maintenance , page 237