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AHA-1540B, AHA-1542B

ADAPTEC, INC.

AHA-1540B, AHA-1542B

(Also Sold as the Maynard HA-101S)

Data bus:

16-bit, ISA

Size:

Three-quarter length, full-height card

Hard drives supported:

Up to seven SCSI devices

Floppy drives supported:

Two 360KB, 720KB, 1.2MB or 1.44MB (AHA-1542B)

None (AHA-1540B, HA-101S)

CONNECTIONS

Function

Location

34-pin data cable connector-floppy drive

CN1

50-pin SCSI connector-internal

CN2

50-pin SCSI connector-external

CN3

4-pin connector-drive active LED

CN4

SCSI ADDRESS

Select

J5/jumper 4

J5/jumper 5

J5/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

SCSI synchronous negotiation disabled

J5/jumper 1

open

 

SCSI synchronous negotiation enabled

J5/jumper 1

closed

Normal operation

J5/jumper 2

open

 

Self diagnostics enabled

J5/jumper 2

closed

SCSI parity check enabled

J5/jumper 3

open

 

SCSI parity check disabled

J5/jumper 3

closed

BIOS enabled

J6/jumper 1

closed

 

BIOS disabled

J6/jumper 1

open

Not used

J6/jumpers 2-4

open

Auto sense enabled

J6/jumper 5

open

 

Auto sense disable

J6/jumper 5

closed

Floppy drive port address 3F0-3F7h

J7/jumper 1

open

 

Floppy drive port address 370-377h

J7/jumper 1

closed

Floppy drive enabled

J8/jumper 1

closed

 

Floppy drive disabled

J8/jumper 1

open

Floppy drive DMA Request is DREQ2

J8/jumper 2

closed

 

Floppy drive DMA Request is DREQ3

J8/jumper 3

closed

Floppy drive DMA Acknowledge Is DACK2

J8/jumper 4

closed

 

Floppy drive DMA Acknowledge is DACK3

J8/jumper 5

closed

Floppy drive Interrupt is IRQ6

J8/jumper 6

closed

 

Floppy drive Interrupt is IRQ10

J8/jumper 7

closed

Floppy drive dual speed disabled

J8/jumper 8

open

 

Floppy drive dual speed enabled

J8/jumper 8

closed

AT Bus DMA Request is DREQ5

J9/jumper 2

closed

 

AT Bus DMA Request is DREQ0

J9/jumper 1

closed

 

AT Bus DMA Request is DREQ6

J9/jumper 3

closed

 

AT Bus DMA Request is DREQ7

J9/jumper 4

closed

 

AT Bus DMA Acknowledge is DACK0

J9/jumper 5

closed

AT Bus DMA Acknowledge is DACK5

J9/jumper 6

closed

 

AT Bus DMA Acknowledge is DACK6

J9/jumper 7

closed

 

AT Bus DMA Acknowledge is DACK7

J9/jumper 8

closed

 

Hard drive Interrupt is IRQ9

J9/jumper 9

closed

 

Hard drive Interrupt is IRQ10

J9/jumper 10

closed

Hard drive Interrupt is IRQ11

J9/jumper 11

closed

 

Hard drive Interrupt is IRQ12

J9/jumper 12

closed

 

Hard drive Interrupt is IRQ14

J9/jumper 13

closed

 

Hard drive Interrupt is IRQ15

J9/jumper 14

closed

DMA CHANNEL

DRQ

J5/jumper 7

J5/jumper 8

5

open

closed

 

6

closed

open

 

7

open

open

 

0

closed

closed

INTERRUPT REQUEST

IRQ

J5/jumper 9

J5/jumper 10

J5/jumper 11

 

9

open

open

open

 

10

closed

open

open

11

open

closed

open

 

12

closed

closed

open

 

14

open

open

closed

 

15

closed

open

closed

DMA TRANSFER RATE

Speed

J5/jumper 12

J5/jumper 13

 

5.0Mb/s

open

open

5.7Mb/s

closed

open

 

6.7Mb/s

open

closed

 

8.0Mb/s

closed

closed

I/O PORT ADDRESS

Address

J7/jumper 2

J7/jumper 3

J7/jumper 4

í 334h

open

open

open

330h

closed

open

open

 

234h

open

closed

open

 

230h

closed

closed

open

 

134h

open

open

closed

 

130h

closed

open

closed

 

Not used

closed

closed

closed

Note: í denotes default for 1540BS11/1542BS11

BUS WAIT STATE

Wait Time

J7/jumper 5

J7/jumper 6

Disable

open

open

 

100nsec

closed

open

 

200nsec

open

closed

 

300nsec

closed

closed

MISCELLANEOUS TECHNICAL NOTE

Note: Manufacturer documentation does not specify possible BIOS memory addresses, but a selection of DC00:6 has been recommended by some card users.