3028

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3028 is the BEX, bus expander.

Introduction

What does it do?

Switches and indicators

  • Allow switch
  • Vital switch
  • Vital on / off indicator
  • Thumbwheel 1 - BEX no. thumbwheel switch
    • 0 : Dev. No. 1000000, Int. Level 13, Ident. Code 10
    • 1 : Dev. No. 1000004, Int. Level 13, Ident. Code 11
    • 2 : Dev. No. 1000010, Int. Level 13, Ident. Code 12
    • 3 : Dev. No. 1000014, Int. Level 13, Ident. Code 13
    • 4 : Dev. No. 1000020, Int. Level 13, Ident. Code 14
    • 5 : Dev. No. 1000024, Int. Level 13, Ident. Code 15
    • 6 : Dev. No. 1000030, Int. Level 13, Ident. Code 16
    • 7 : Dev. No. 1000034, Int. Level 13, Ident. Code 17

Note: BEX No. 0 is defined as MASTER BEX and should be placed in the A crate.

  • 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. On each BEX connected to a crate containing memory, the limit switches are used to specify the memory area covered by the crate. These values could also be set by a program.

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