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3024 is the N10 Bus adapter.


What does it do?

Switches and indicators

From the top of the card

  • External bus number selection, thumbwheel switch
    • setting 0 - 15 corresponds to external bus number 0 - 15
  • LED 2 (Yellow): Fast DMA Indicator
  • SW4 Fast DMA switch
    • 0 - LED 2 is not lit. The ND-100 bus is kept reserved until the external bus has finished the DMA cycle (CONNECT no longer true).
    • 1 - LED 2 is lit. The ND-100 bus is released to CPU or DMA devices as soon as the necessary DMA data exchange on the ND-100 bus is finished (arrival of DRY) and while the external bus is ending its DMA cycle.
    • The switch must be set to 0 if the DMA bandwidth of the external bus is very critical (the bus needs every DMA cycle in periods). Otherwise, the switch should be set to 1, which gives optimum usage of the ND-100 bus. To be compatible with the 3008 module, the switch must be set to 0.
  • LED 1 (Yellow): CIO indicator
  • SW3 CIO switch
    • 0 - LED 1 is not lit. All IOX addresses (0-077777) will pass and and all the ident. codes are read. (the 3008 module forced bits 8-15 in the ident codes to 0 (zero) when the switch was inactive).
    • 1 - LED 1 is lit. Customer I/O enables inly IOx addresses 2000 - 3777 to the external bus. Bit 8 in the ident. code is set to 1. Ident code bits 9-15 are forced to 0 (zero).
  • LED 3 (Red): BLOCK indicator
  • SW1 BLOCK switch
    • 0 - DISABLE - LED 3 is lit. The block switch inhibits all incoming / outgoing signals to / from the external bus.
    • 1 - ENABLE - LED 3 is not lit. A MASTER CLEAR pulse is sent to the external bus when switching from disable to enable.
    • Bit 13 in the programmable register simulates the block switch.


the C connector is used for the ND-100 Bus.

I/O Devices on the card



Norsk Data Document ND–30.008.3 EN ND-100 Hardware Maintenance , page 196