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''3106''' is the 8 inch and floppy controller + streamer controller card.

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==Introduction==
It is a controller for floppy drives (8 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==
* error code display
*thumbwheel switch - device number selection
**0 - device number 1560
**1 - device number 1570

==Connectors==
The A connector is used for floppy drives, the B connector is used for streamer devices, 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, single 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

==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-630
==See also==
*[[3027]]
*[[3112]]

==References==
*{{ND-doc|11.021.01}}
*Related manuals: {{ND-doc|11.015}}
* {{ND-doc|30.008.3 EN}}, page 241
[[Category:ND-100 hardware]]