AHA - 1542B o 1 Synchronous Transfer Negotiation Enable o 2

AHA - 1542B
o 1 Synchronous Transfer Negotiation Enable
o 2 Diagnostics (used only at Adaptec)
o 3 SCSI Parity disable
o4 0 X 0 X 0 X 0 X
o5 0 0 X X 0 0 X X
o6 0 0 0 0 X X X X
-----------------------7 6 5 4 3 2 1 0
SCSI Address I.D. (SCSI disks
should be set for ID 0 and 1)
o7 0 X 0 X
x8 0 0 X X
-----------7 6 5 0
DMA Channel Select
(see also Jumper J9)
o9 0 X 0 X 0 X
x 10 0 0 X X 0 0
o 11 0 0 0 0 X X
-----------------9 10 11 12 14 15
Interrupt Channel Select
(see also Jumper J9)
o 12 0 X 0 X
o 13 0 0 X X
5.0 5.7 6.7 8.0
DMA Transfer Speed
in Mbytes/sec
J6 - BIOS/Auto Sense Configure
Pin 1 2 3 4 5
X 0 0 0 0
Use pin 2 when upgrading the
BIOS to support > 1 Gig.
1 - BIOS Enable
2,3,4 - Not used.
5 - Auto Sense disable
J7 - Address Selection
o 1 Floppy Secondary Address select.
(AHA only)
X2 0 X 0 X 0 X
o3 0 0 X X 0 0
o4 0 0 0 0 X X
----------------------334 330 234 230 134 130
AT UO Port Address. Select in Hexadecimal.
o5 0 X 0 x
o6 0 0 X X
--------------0 100 200 300
BIOS Wait State Select in nanoseconds
o7 0 X 0 X
o8 0 0 X X
------------------------DC000 CC000 D8000 C8000
BIOS Base Address in Hexadecimal
J8 - Floppy Disk Selection (AHA - 1542B only)
Pin 1 2 3 4 5 6 7 8
X X 0 X 0 X 0 0
1 - Floppy Enable
2,3 - DMA Request 2 or 3 select
4,5 - DMA ACK 2 or 3 select
6,7 - INT Request 6 or 10 select
8 - Dual Speed enable
J9 - DMA/Interrupt Selection
o 1 DMA Request 0 Select
X 2 DMA Request 5 Select
o 3 DMA Request 6 Select
o 4 DMA Request 7 Select
o 5 DMA ACK 0 Select
X 6 DMA ACK 5 Select
o 7 DMA ACK 6 Select
o 8 DMA ACK 7 Select
o 9 INT Request 9 Select
o 10 INT Request 10 Select
X 11 INT Request 11 Select
o 12 INT Request 12 Select
o 13 INT Request 14 Select
o 14 INT Request 15 Select
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