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1.
th99
SCIENTIFIC MICRO SYSTEMS
Data bus:8-bit, ISA
Size:Half-length, full-height card
Hard drives supported: OMTI 5520A:Two MFM ST506/ST412 drives
OMTI 5527A:Two RLL ST506/ST412 drives
Floppy drives supportedNone
Maximum heads/cyl.:16 heads and 2048 cylinders
CONNECTIONS
FunctionLocation
34-pin control cable connector-hard driveJ1
20-pin data cable connector-drive 0J2
20-pin data cable connector-drive 1J3
6-pin DC power connectorJ4
USER CONFIGURABLE SETTINGS
FunctionLocationSetting
»BIOS enabledW7open
 BIOS disabledW7closed
»BIOS base address is C8000hW8open
 BIOS base address is CA000hW8closed
»Factory configured - do not alterW9N/A
»Factory configured - do not alterW10N/A
»Factory configured - do not alterW11N/A
»Drive 0 soft sectoredW11open
 Drive 0 hard sectoredW11closed
»Factory configured - do not alterW12all
»Drive 1 soft sectoredW14open
 Drive 1 hard sectoredW14closed
»Not documentedW17 to 19N/A
I/O PORT ADDRESS
AddressJumper W5Jumper W6
»320hopenopen
 324hclosedopen
 328hopenclosed
 32Chclosedclosed
MISCELLANEOUS TECHNICAL NOTES
W1 through W4 are used to configure the drive type. To support most of the drives on the market, there have been several different BIOS's offered. The different BIOS drive type tables are listed with the 5510; The jumper settings are the same for the 5520A and the 5527A.
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timestamp 2026-06-19 17:39:51