3031

3031 is the N100 bus controller.

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Introduction

What does it do?

Switches and indicators

• short timeout indicator (lit if short timeout is selected)
• timeout selector
  • short timeout (2 mS)
  • long timeout (8 mS)

A BUSC controlling a memory bank should have a short timeout. A BUSC controlling an I/O bus should have a long timeout.

• ADOK - Address OK indicates which bank the last master-bus cycle was accessing. It is reset by start of next master-bus memory cycle.
• extended device number switch
• interleave selector
• device number
• Base-setting display
• Upper-limit display
• Lower-limit display
• Base address switches
• Upper limit switches
• Lower limit switches

For Base, Upper and Lower limit switches: the most-significant switch is topmost, and the least-significant switch is closest to the bottom of the card. The address area for a bus controller is decided by the setting of lower and upper address limit. The limit-address increments are 64K units.

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?

References

• Norsk Data Document ND–30.008.3 EN ND-100 Hardware Maintenance , page 206