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BUSLOGIC, INC.

BT-545S

Data bus: 16-bit, ISA
Size: Three/quarter-length, full-height card
Hard drive supported: Up to seven SCSI drives
Floppy drives supported: Two 360KB, 720KB, 1.2MB or 1.44MB drives

CONNECTIONS
Function Location
4-pin connector - Drive Active LED J1
34-pin cable connector - floppy drive J2
50-pin SCSI connector - internal J3
50-pin SCSI connector - external J4

 
SCSI ADDRESS
Address SB1/switch 1 SB1/switch 2 SB1/switch 3
     0 off off off
     1 off off on
     2 off on off
     3 off on on
     4 on off off
     5 on off on
     6 on on off
 7 on on on

 
DMA CHANNEL
DRQ SB1/switch 7 SB1/switch 8
     Disabled off off
     DRQ7 on off
     DRQ6 off on
 DRQ5 on on

 
I/O PORT ADDRESS
Address SB2/switch 1 SB2/switch 2 SB2/switch 3
     Reserved off off off
     134-137h off off on
     234-237h off on off
     334-337h off on on
     Reserved on off off
     130-133h on off on
     230-233h on on off
 330-333h on on on

 
BIOS ADDRESS
Address SB2/switch 4 SB2/switch 5
     C800h off off
     Disabled on off
     D800h off on
 DC00h on on

 
INTERRUPT REQUEST
IRQ SB2/switch 6 SB2/switch 7 SB2/switch 8
Reserved off off off
Reserved off off on
     IRQ15 off on off
     IRQ14 off on on
     IRQ12 on off off
     IRQ9 on off on
     IRQ10 on on off
 IRQ11 on on on
Jumpers W3-W8 must be set in accordance with SB2/switches 6-8

 
USER CONFIGURABLE SETTINGS
Function Location Setting
SCSI parity check enabled SB1/switch 4 on
     SCSI parity check disabled SB1/switch 4 off
     >1GB drive support disabled SB1/switch 5 on
     >1GB drive support enabled* SB1/switch 5 off
Sync Negotiation initiated by BT-545S disabled SB1/switch 6 on
     Sync Negotiation initiated by BT-545S enabled SB1/switch 6 off
Factory Configured - do not alter W2 open
Factory Configured - do not alter W9 open
Floppy drive port address is 3F0-3F7h W14 open
     Floppy drive port address is 370-377h W14 closed
Floppy drive enabled W15 & W16 closed
     Floppy drive disabled W15 & W16 open
IOCHRDY enabled W17 Pins 1-2 closed
     IOCHRDY disabled W17 Pins 2-3 closed
Factory Configured - do not alter W18 closed
Sync transfer rate is 5MB/sec W19 closed
Sync transfer rate is 10MB/sec W19 open
Note: The SCO UNIX device driver does not support drives greater than 1GB.

 
DMA TRANSFER RATE
Speed W11 W13
5MB/sec open open
     5.7MB/sec open closed
     6.7MB/sec closed open
     8.0MB/sec closed closed

 
INTERRUPT REQUEST
IRQ W3 W4 W5 W6 W7 W8
     IRQ15 closed open open open open open
     IRQ14 open closed open open open open
     IRQ12 open open closed open open open
IRQ11 open open open closed open open
     IRQ10 open open open open closed open
     IRQ9 open open open open open closed
SB2/switches 6-8 must be set in accordance with jumpers W3-W8

 
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