Bus Master PC/AT SCSI Adapter  
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Switches 0 = Off, 1 = On, (*) = default                
                                                       
                        Bay     Switch#         BT-542B
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Host Adapter            1       1,2,3 = 000     0      
SCSI ID                                 100     1      
                                        010     2      
                                        110     3      
                                        001     4      
                                        101     5      
                                        011     6      
                                        111  (*)7      
SCSI Parity             1           4 = 0       Disable
                                    4 = 1    (*)Enable 
Disk > 1GB &            1           5 = 0       Enable 
not SCO UNIX                        5 = 1    (*)Disable
Adapter Initiate        1           6 = 0       Enable 
Synchronous Negotiation             6 = 1    (*)Disable   
Host Dma Channel        1         7,8 = 00      Disable   
                                        10      7         
                                        01      6         
                                        11   (*)5         
Host I/O Port           2       1,2,3 = 000     Reserved  
                                        100     134h-137h 
                                        010     234h-237h 
                                        110     334h-337h 
                                        001     Reserved  
                                        101     130h-133h 
                                        011     230h-233h 
                                        111  (*)330h-333h 
Host Bios address       2         4,5 = 00      0c8000h   
16Kb                                    10      Disable   
                                        01      0d8000h   
                                        11      (*)0dc000h
Host interrupt          2       6,7,8 = 000     Reserved  
Request                         100     Reserved          
                                010     15               
                                110     14               
                                001     12               
                                101     9                
                                011     10               
                                111  (*)11               
                                                         
                Jumpers 0 = Open, 1 = Close (*) = default
                                                         
                        Jumper#         BT-542B          
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Host Interrupt          W3              15               
Channel                 W4              14               
                        W5              12               
                        W6           (*)11               
                        W7              10               
                        W8              9                
DMA Transfer            W11,W13 = 00 (*)5 Mb/s           
Speed                             01    5.7              
                                                      
                        Jumper#         BT-542B       
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Host Interrupt          W3              15            
Channel                 W4              14            
                        W5              12            
                        W6           (*)11            
                        W7              10            
                        W8              9             
DMA Transfer            W11,W13 = 00 (*)5 Mb/s        
Speed                             01    5.7           
                                  10    6.7           
                                  11    8.0           
Floppy Subsystem        W14 = 0      (*)Primary 3Fxh  
                        W14 = 1         Secondary 37xh
                        W15,W16 = 00    Disable       
                                  11 (*)Enable        
Host I/O Channel        W17 = A-B    (*)Enable        
Ready                   W17 = B-C       Disable