3027

3027 is the Floppy disk controller for DMA.

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Introduction

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.

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

not described yet.

See also

• 3106
• 3112

Reference

• Norsk Data Document ND–06.015.02 ND-100 FUNCTIONAL DESCRIPTION
• Norsk Data Document ND–11.015.01 FLOPPY DISK CONTROLLER - 3027
• Norsk Data Document ND–30.008.3 EN ND-100 Hardware Maintenance , page 199