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3027 is the Floppy disk controller for DMA.


A floppy controller for 8 inch floppy drives.

Switches and indicators

From top of the card

A three digits error code display. After Master Clear, the floppy controller will start a selftest. If successful, 000 will be shown, else an error code is displayed here. During transfer 000 is normally displayed. If an error occurs, and "E" with an error code is displayed.

A device number thumbwheel switch

  • 0 - floppy disk system no 1 - device number 1560 (octal) - Ident = 21
  • 1 - floppy disk system no 2 - device number 1570 (octal) - Ident = 22

Setting 2-15 are unused, will answer on IOX 0-7.


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

not described yet.

See also