ADAPTEC, INC.

AHA-1520, AHA-1522

Data

bus:

16-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

CONNECTIONS

Function

Location

34-pin data cable connector-floppy drive

CN1

50-pin SCSI cable connector-internal

CN2

50-pin SCSI cable connector-external

CN3

USER CONFIGURABLE SETTINGS

Function

Location

Setting

»

Data transfer in DMA disabled

J5/jumper 1

open

 

Data transfer in DMA enabled

J5/jumper 1

closed

»

Boot enabled (Intercept INT19 call)

J5/jumper 2

closed

 

Boot disabled (INT19 normal)

J5/jumper 2

open

»

Synchronous negotiation enabled

J5/jumper 5

closed

 

Synchronous negotiation disabled

J5/jumper 5

open

»

Disconnect by target / INT15 enabled

J5/jumper 6

closed

 

Disconnect by target / INT15 disabled

J5/jumper 6

open

»

Factory configured - do not alter

J5/jumpers 7 & 8

open

USER CONFIGURABLE SETTINGS

Function

Location

Setting

»

SCSI parity check enabled

J6/jumper 8

open

 

SCSI parity check disabled

J6/jumper 8

closed

»

Floppy drive enabled

J7/jumper 1

closed

 

Floppy drive disabled

J7/jumper 1

open

»

Floppy drive Interrupt is IRQ6

J7/jumper 6

closed

 

Floppy drive Interrupt is IRQ10

J7/jumper 7

closed

»

Floppy drive-dual speed disabled

J7/jumper 8

open

 

Floppy drive-dual speed enabled

J7/jumper 8

closed

»

I/O port address 340h

J9/jumper 5

open

 

I/O port address 140h

J9/jumper 5

closed

SCSI ADDRESS

SCSI ID

J6/jumper 1

J6/jumper 2

J6/jumper 3

 

0

open

open

open

 

1

closed

open

open

 

2

open

closed

open

 

3

closed

closed

open

 

4

open

open

closed

 

5

closed

open

closed

 

6

open

closed

closed

»

7

closed

closed

closed

DMA CHANNEL

DMA

J6/6

J6/7

J8/1 & 5

J8/2 & 6

J8/3 & 7

J8/4 & 8

 

7

closed

closed

closed

open

open

open

 

6

open

closed

open

closed

open

open

 

5

closed

open

open

open

closed

open

»

0

open

open

open

open

open

closed

INTERRUPT REQUEST

IRQ

J6/4

J6/5

J9/1

J9/2

J9/3

J9/4

 

IRQ9

open

open

open

open

open

closed

 

IRQ10

closed

open

open

open

closed

open

»

IRQ11

open

closed

open

closed

open

open

 

IRQ12

closed

closed

closed

open

open

open

BIOS ADDRESS

Address

J9/jumper 6

J9/jumper 7

J9/jumper 8

»

DC000h

closed

closed

closed

 

C8000h

open

open

closed

 

CC000h

open

closed

closed

 

D8000h

closed

open

closed

 

Disabled

N/A

N/A

open

FLOPPY DRIVE DMA - J7

 

DRQ

DACK

 

DMA

Jumper 2

Jumper 3

Jumper 4

Jumper 5

»

DMA Channel 2

closed

open

closed

open

 

DMA Channel 3

open

closed

open

closed

MESSAGE SELECT

MSG #0 - ADAPTEC HEADERMSG #1 - JUMPER CONFIG. INFO. MSG #2 - SCSI DEVICE INFO.

MSG #3 - BOOT PROGRESS INFO.MSG #4 - ERROR MESSAGES

Message

JP5/jumper 3

JP5/jumper 4

»

Msg #0 and #4

open

open

 

Msg #0, #3 and #4

open

closed

 

All messages displayed

closed

open

 

Msg #4 only

closed

closed