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BT-545S

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