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COGENT DATA TECHNOLOGIES, INC. DISKMASTER
Data bus:16-bit, ISA
Size:Full-length, full-height card
Hard drives supported: Two RLL ST506/412 and two ESDI drives, or
four ESDI drives may be daisy-chained off of CN2
Floppy drives supported:Two 360KB, 720KB, 1.2MB, or 1.44MB

CONNECTIONS
FunctionLocation
34-pin control cable connector-ST506 hard drivesCN1
34-pin control cable connector-ESDI hard drivesCN2
34-pin data cable connector-floppy driveCN3
20-pin data cable connector-drive 1CN4
20-pin data cable connector-drive 2CN5
20-pin data cable connector-drive 3CN6
20-pin data cable connector-drive 4CN7
6-pin EACK connector - (For use with an E/MASTER Ethernet board)CN9
6-pin ERQ connector - (For use with an E/MASTER Ethernet board)CN10
4-pin connector-drive active LEDCN31
USER CONFIGURABLE SETTINGS
FunctionLocationSetting
»No DMA expansionJP4closed
 Supports E/Master ethernetJP4open
»Drive 4 is an ST506JP5*pins 1 & 2 closed
 Drive 4 is an ESDIJP5*pins 2 & 3 closed
»Drive 3 is an ST506JP6*pins 1 & 2 closed
 Drive 3 is an ESDIJP6*pins 2 & 3 closed
»Drive 2 is an ESDIJP7*pins 2 & 3 closed
 Drive 2 is an ST506JP7*pins 1 & 2 closed
»Drive 1 is an ESDIJP8*pins 2 & 3 closed
 Drive 1 is an ST506JP8*pins 1 & 2 closed
»Floppy drive enabledJP36pins 2 & 3 closed
 Floppy drive disabledJP36pins 1 & 2 closed
»Reserved for future useJP37-39open
Note:* Both pin sets must be set alike
CONTROLLER CLOCK CONFIGURATION
FunctionJP40JP41
»Set at 10MHzpins 2 & 3 closedpins 1 & 2 closed
 Disabled, bus clock timing enabledpins 1 & 2 closedpins 2 & 3 closed
DMA CHANNEL
DRQJP1 & JP2/jumper 1JP1 & JP2/jumper 2JP1 & JP2/jumper 3
 DRQ5closedopenopen
»DRQ6openclosedopen
 DRQ7openopenclosed
INTERRUPT REQUEST - JP3
#Jumper 1Jumper 2Jumper 3Jumper 4Jumper 5Jumper 6Jumper 7
3closedopenopenopenopenopenopen
5openclosedopenopenopenopenopen
9openopenclosedopenopenopenopen
10openopenopenclosedopenopenopen
12openopenopenopenclosedopenopen
14openopenopenopenopenclosedopen
15openopenopenopenopenopenclosed
BIOS ADDRESS
ADDRESSBINARYJP18JP17JP16JP15JP14JP13
C80001100100Pins 1-2Pins 2-3Pins 2-3Pins 1-2Pins 2-3Pins 2-4
Note:Pins designated should be in the closed position.
Binary onePROM size 8KBBinary zeroPROM size 8KBBinary zeroPROM size 16KB
MISCELLANEOUS TECHNICAL NOTES
The BIOS address settings range is C800 - E000 and is selected with JP12-19 using a binary translation. JP12 (LSB) and JP19 (MSB) are internal and assumed to be 0 and 1 respectively. JP13 - JP18 are set: pins 1-2 closed= 1; pins 2-3 closed= 0. Default is C8000:In addition to serving as the 21 place in the BIOS address selection, JP13 is also used to determine PROM size (8KB or 16KB). Due to the pin assignment a PROM cannot have an address with a 1 in the 21 place (such as 11000110) and be 16KB (see above).
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timestamp 2026-08-02 02:30:09