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AHA-1540A, AHA-1542A

ADAPTEC, INC.

AHA-1540A, AHA-1542A

Data bus:

16-bit, ISA

Size:

Full-length, full-height card

Hard drives supported:

Up to seven SCSI devices

Floppy drives supported:

Two 360KB, 720KB, 1.2MB or 1.44MB

CONNECTIONS

Function

Location

50-pin SCSI connector-external

CN1

50-pin SCSI connector-internal

CN2

34-pin data cable connector-floppy drive

CN4

4-pin connector-drive active LED

J5

SCSI ADDRESS

SCSI ID

J1/jumper 4

J1/jumper 5

J1/jumper 6

7

open

open

open

 

6

closed

open

open

 

5

open

closed

open

 

4

closed

closed

open

 

3

open

open

closed

 

2

closed

open

closed

 

1

open

closed

closed

 

0

closed

closed

closed

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Synchronous negotiation disabled

J1/jumper 1

open

 

Synchronous negotiation enabled

J1/jumper 1

closed

Factory test disabled

J1/jumper 2

open

 

Factory test enabled

J1/jumper 2

closed

SCSI parity checking enabled

J1/jumper 3

open

 

SCSI parity checking disabled

J1/jumper 3

closed

LA enable (Only on early W1542A)

J8

closed

 

LA disable (Only on early W1542A)

J8

open

Auto request sense enabled

J9/jumper 1

open

 

Auto request sense disabled

J9/jumper 1

closed

Factory configured - do not alter

J9/jumpers 2-4

open

BOIS enabled

J11

closed

 

BIOS disabled

J11

open

Floppy address 3F0-3F7h

J12

open

 

Floppy address 370-377h

J12

closed

Floppy drive enabled

J13

closed

 

Floppy drive disabled

J13

open

Floppy drive Interrupt is IRQ6

J17

pins 1 & 2 closed

 

Floppy drive Interrupt is IRQ10

J17

pins 2 & 3 closed

Floppy drive DMA Request is DREQ2

J18

pins 1 & 2 closed

 

Floppy drive DMA Request is DREQ3

J18

pins 2 & 3 closed

Floppy drive DMA Acknowledge Is DACK2

J19

pins 1 & 2 closed

 

Floppy drive DMA Acknowledge is DACK3

J19

pins 2 & 3 closed

DMA CHANNEL

DRQ

J1/Jumper 7

J1/Jumper 8

J14

J15

 

0

closed

closed

Jumper 1-closed

Jumper 1-closed

5

open

closed

Jumper 2-closed

Jumper 2-closed

 

6

closed

open

Jumper 3-closed

Jumper 3-closed

 

7

open

open

Jumper 4-closed

Jumper 4-closed

INTERRUPT REQUEST

IRQ

J1/Jumper 9

J1/Jumper 10

J1/Jumper 11

J16

 

9

open

open

open

Jumper 1-closed

 

10

closed

open

open

Jumper 2-closed

11

open

closed

open

Jumper 3-closed

 

12

closed

closed

open

Jumper 4-closed

 

14

open

open

closed

Jumper 5-closed

 

15

closed

open

closed

Jumper 6-closed

DMA TRANSFER RATE

Speed

J1/jumper 12

J1/jumper 13

5.0

open

open

 

5.7

closed

open

 

6.7

open

closed

 

8.0

closed

closed

I/O PORT ADDRESS

Address

J6/Jumper 1

J6/Jumper 2

J6/Jumper 3

 

334h

open

open

open

330h

open

open

closed

 

234h

open

closed

open

 

230h

open

closed

closed

 

134h

closed

open

open

 

130h

closed

open

closed

BUS WAIT STATE

Delay

J7/jumper 1

J7/jumper 2

J7/jumper 3

J7/jumper 4

Disable

closed

open

open

open

 

100nsec

open

closed

open

open

 

200nsec

open

open

closed

open

 

300nsec

open

open

open

closed

BIOS ADDRESS

Address

J10/jumper 1

J10/jumper 2

DC000h

open

open

 

CC000h

closed

open

 

D8000h

open

closed

 

C8000h

closed

closed