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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/umper 1 open
     Synchronous negotiation enabled J1/umper 1 closed
Factory test disabled J1/umper 2 open
     Factory test enabled J1/umper 2 closed
SCSI parity checking enabled J1/umper 3 open
     SCSI parity checking disabled J1/umper 3 closed
LA enable (Only on early W1542A) J8 closed
     LA disable (Only on early W1542A) J8 open
Auto request sense enabled J9/umper 1 open
     Auto request sense disabled J9/umper 1 closed
Factory configured - do not alter J9/umpers 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

 
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