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1.
th99
CONTROL CONCEPTS, INC.
Data bus:8-bit, ISA
Size:Half-length, full-height card
Hard drives supported: Up to seven SCSI devices
Floppy drives supported:Two 360KB, 720KB, 1.2MB, or 1.44MB (Floppy support version only)
MISCELLANEOUS TECHNICAL NOTE
S1/switch 7 is not used and should remain off.Turning on S1/switch 8 will result in error
CONTROL CONCEPTS USAHB A8
CONNECTIONS
FunctionLocation
4-pin connector-drive active LEDCN1
50-pin SCSI connector-internalCN2
34-pin data cable connector-floppy driveCN3
25-pinSCSI connector-externalCN4
USER CONFIGURABLE SETTINGS
FunctionLocationSetting
»Floppy drive enabledJP1pins 1 & 2 closed
 Floppy drive disabledJP1pins 2 & 3 closed
»Floppy drive address 3F0-3F7hJP2pins 1 & 2 closed
 Floppy drive address 370-377hJP2pins 2 & 3 closed
»Single spindle speed selectedJP3open
 Dual spindle speed selectedJP3closed
 IRQ3 (Interrupt request-N/A in DOS)JP4/jumper 1closed
 IRQ4 (Interrupt request-N/A in DOS)JP4/jumper 2closed
»IRQ5 (Interrupt request-N/A in DOS)JP4/jumper 3closed
 IRQ7 (Interrupt request-N/A in DOS)JP4/jumper 4closed
»Precompensation value is 125nsJP5open
 Precompensation value is 185nsJP5closed
BIOS ADDRESS
AddressS1/switch 1S1/switch 2S1/switch 3
C8000-CBE80hoffonon
E0000-E3E80honoffon
DC000-DFE80hoffoffon
D8000-DBE80hononoff
D4000-D7E80hoffonoff
D0000-D3E80honoffoff
CC000-CFE80hoffoffoff
SCSI ADDRESS
SCSI ID #S1/switch 4S1/switch 5S1/switch 6
»7offoffoff
 6onoffoff
 5offonoff
 4ononoff
 3offoffon
 2onoffon
 1offonon
 0ononon
(0)

timestamp 2026-07-26 09:03:58