3112

3112 is the 8 inch and 5.25 inch floppy controller + streamer controller card.

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Introduction

It is a controller for floppy drives (8 and 5.25 inch) and a tape streamer. This is a microprocessor-based controller/formatter which performs control functions and data transfer between the CPU and a floppy disk drive or a streaming tape drive. The controller/formatter consists of an interface towards a ND-100 bus, a complete floppy disk controller, and a QIC-02 streaming tape cartridge, all based on an 8 bit microprocessor (Z80A).

A maximum of four Streaming Tape Drives and four Floppy Disk drives may be connected to the controller.

The FLOPPY DISK CONTROLLER can read/write on single/double density and single/double sided diskettes. Data transfer and exchange of commands/status are performed with DMA (Direct Memory Access).

The controller is compatible with previous single sided controllers. For "stand-alone" use, a new version of FLO-MON (FLOppy-MONitor-2010F or newer) must be dumped on the diskette.

Switches and indicators

• thumbwheel switch - device number selection
  • 0 - device number 1560
  • 1 - device number 1570

Connectors

The A and B connectors are used for I/O, the C connector is used for the ND-100 Bus.

Floppy drives are connected via a daisy chain from connector A (unit 0 - 3) and streamer cartridge drives are connected via a daisy chain from connector B (unit 0 - 3).

I/O Devices on the card

Read data

address: device address + 0

Read Status

address: device address + 2

Load Control Word

address: device address + 3

Read Status

address: device address + 4

Load Pointer High (Bit 16-23)

address: device address + 5

Load Pointer Low / Load Data

address: device address + 7

Unused IOXs does not give an IOX error.

Note: Reading either status gives the same result. They are duplicated to make it possible for microprograms in the ND-100 CPU to perform both Binary Format Load and Mass Storage Load (1560& and 21560).

The IOXs devno + 5 and devno + 7 are used to form the pointer to the location in the ND-100 memory where the controller finds the Command block. In tests, these IOXs are given direct meaning in different tests.

Floppy Formats

• 0 IBM SYS-32-II 512 bytes / sector, single side, single density
• 1 IBM 3600 256 bytes / sector, single side, single density
• 2 IBM 3740 128 bytes / sector, single side, single density
• 3 Illegal
• 4 non IBM 512 bytes / sector, double side, single density
• 5 non IBM 256 bytes / sector, double side, single density
• 6 non IBM 128 bytes / sector, double side, single density
• 7 Illegal
• 10 non IBM 512 bytes / sector, single side, double density
• 11 IBM SYS-34 256 bytes / sector, single side, double density
• 12 Illegal
• 13 non IBM 1024 bytes / sector, double side, double density
• 14 non IBM 512 bytes / sector, double side, double density
• 15 IBM SYS-34 256 bytes / sector, double side, double density
• 16 Illegal
• 17 non IBM 1024 bytes / sector, double side, double density
• 20 Illegal
• 21 Illegal
• 22 Basic 5.25 inch 128 bytes / sector, single side, single density
• 23 - 33 Illegal
• 34 IBM PC
• 35 - 57 Illegal
• 60 - 77 User specified

Error Codes

These error codes are given in bits 9-15 of status word 1 . The codes are also shown in the digit display on the rear edge of the controller.

• 00 OK
• 01 - 04 not used
• 05 CRC error
• 06 Sector not found
• 07 Track not found
• 34 - 37 not used

autoload errors

• 50 No bootstrap found on diskette
• 51 Wrong bootstrap (out of date flo-mon version)
• 53 - 57 not used

Streamer errors

• 60 Streamer handshake error
• 61 Streamer status transfer error
• 62 Bad cartridge
• 63 No cartridge installed
• 64 End of tape, cartridge full
• 65 Streamer drive error
• 66 Unidentified exception
• 67 Illegal command to streamer

Self test errors

• 70 PROM checksum error
• 71 RAM error
• 72 CTC error
• 73 DMA CTRL error
• 74 VCO error
• 75 Floppy controller error
• 76 Streamer data register error
• 77 ND-100 register error

ND sales number

• ND-317

Reference

Norsk Data Document ND–11.021.01 FLOPPY AND STREAMER CONTROLLER 3106/3112