SCSI to MFM Controller card

Product Information
This Western Digital controller card will allow an MFM Hard disk to work on a standard SCSI disk interface. This was removed working from a Fluke 9100 Digital Test System in 2007 after an upgrade. It is in fantastic condition and stored properly ever since.

Markings:
WD1002S-SHD (Western Digital model number)
WDC 60-000055-03 Rev A
ASSY 61-000077

Some detailed information about this controller :
Jumper functions (W17 to W22, R23, and W25 to W28)
The following list explains the jumper functions.
W17 & W18 selects factory drive tables for the first hard disk
W19 &W20 selects factory drive tables for the second hard disk
W21 & W22 sects the controller and BIOS address ranges
R23 enables or disables the Western Digital BIOS ROM on the WD1004A board
W25 and W26 always OUT
W27 sets the hardware interrupt (IRQ) value for the hard disk drive
W28 allows the controller to operate with an XT computer when the  jumper is OUT.

Pre-selected Drive Tables
TABLE FIRST DRIVE SECOND DRIVECAPACITY HEADS CYLINDERS
NUMBER W17 W18 W19 W 20
0 ININ IN IN 21MB 4612
1 OUTIN OUT IN 10MB 4306
2 IN OUT IN OUT 10MB 2615
3 OUT OUT OUT OUT 21MB 4615

Select Controller and BIOS Ranges
W21W22CONTROLLERBIOS

OUTOUT320-323C8000-C9FFF
INOUT324-327CA000-CBFFF
OUTIN328-32BCC000-CDFFF
ININ32C-32FCE0000-CFFFF
 
Select BIOS ROM
R23SELECT BIOS
INDISABLE Western Digital BIOS (ALLOWS EXTERNAL BIOS SELECTION)
OUTENABLE Western Digital BIOS (SELECTS INTERNAL BIOS)

Select Hardware Interrupt (IRQ)
W27SELECT IRQ

IN SELECTS IRQ 2
OUTSELECTS IRQ 5

Price: £25.00

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