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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 Header  Msg #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

 
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