Hier die Jumperbelegung der AHA - 1542 B / 1540 B (mit und ohne Floppy): (Auszug aus "adaptec AHA - 1540B / 1542B Installation Guide")

Jumpers installed at the factory are shown as "(x)" Those not installed are shown os "o" It should not be necessary to change the jumper settings.

 
J5 - General Controll 
  o   1  - Synchronous Transfer negotiation enable 
  o   2  - Diagnostics (used only at Adaptec) 
  o   3  - SCSI Parity disable 
 
  o   4    o x o x o x o x   | SCSI Address ID 
  o   5    o o x x o o x x   | (SCSI disks should be set 
  o   6    o o o o x x x x   | for ID 0 and 1) 
           ---------------   | 
           7 6 5 4 3 2 1 0  <? 
 
  o   7    o x o x   | DMA Channel Select 
 (x)  8    o o x x   | (see also Jumper J9) 
           -------   | 
           7 6 5 0  <? 
 
  o   9    o  x  o  x  o  x   | Interrupt Channel 
 (x) 10    o  o  x  x  o  o   | Select 
  o  11    o  o  o  o  x  x   | 
           ----------------   | 
           9 10 11 12 14 15  <? 
 
  o  12    o   x   o   x     | DMA Transfer Speed 
  o  13    o   o   x   x     | In MBytes/sec 
           ---------------   | 
           5.0 5.7 6.7 8.0  <? 
 
 
J6 - BIOS/Auto Sense Control 
 (x)  1  - BIOS Enable 
  o   2  - not used 
  o   3  - not used 
  o   4  - not used 
  o   5  - Auto Sense disable 
 
J7 - Address Selection 
  o   1  - Floppy Secondary Address select (AHA-1542B only) 
 
 (x)  2     o   x   o   x   o   x    | AT I/O Port Address 
  o   3     o   o   x   x   o   o    | select in hexadecimal 
  o   4     o   o   o   o   x   x    | 
           -----------------------   | 
           334 330 234 230 134 130  <? 
 
  o   5     o   x   o   x    | BIOS Wait State 
  o   6     o   o   x   x    | Select in nanoseconds 
           ---------------   | 
            0  100 200 300  <? 
 
  o   7      o     x     o     x     | BIOS Base Address 
  o   8      o     o     x     x     | Select in hexadecimal 
           -----------------------   | 
           DC000 CC000 D8000 C8000  <? 
 
J8 - Floppy Disk Selection (AHA-1542B only) 
 (x)  1  - Floppy enable            ?-----------------------------™ 
 (x)  2  - DMA Request 2 select     | Note: On 1542BS100 series.  | 
  o   3  - DMA Request 3 select     | If the floppy enable jumper | 
 (x)  4  - DMA ACK 2 select         | is removed, remove all      | 
  o   5  - DMA ACK 3 select         | jumpers from J8             | 
 (x)  6  - INT Request 6 select     ?-----------------------------? 
  o   7  - INT Request 10 select 
  o   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