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      Silicon Valley Computers, Inc.                          ADP-20       
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      P1: HD LED (4 pins)               P1  P2     P3                     
      P2: Hard Drive (40 pins)        Ŀ          
      P3: Floppy Drive (34 pins)      ....                              
                                      1:::::::: 1::::::                 
                                                                        
                                                 1:::5                  
                                             ڿ            ٺ          
                                                   
                                                  E1-E5                    
      INTERFACE:  ISA(AT)->IDE(AT)                                         
      CONTROLS:   2 Floppy Drives (360KB, 720KB, 1.2MB, 1.44MB)            
                  2 IDE Hard Drives                                        
                                                                           
                                                                           
      E1,E4: Floppy Drive Enable:  Both jumpers are hardwired on the back  
                                   of the pcboard.  To disable the floppy, 
                                   the traces must be cut (voids the       
                                   warranty).  To re-enable floppy support,
                                   E1 & E4 must be jumpered.               
                                                                           
      E2: Floppy Precompensation                                           
          125ns: E2 Jumpered                                               
         *105ns: (no Jumper)                 *(Factory Default)            
                                                                           
      E3: Dual Speed Floppy Support                                        
          Dual Speed Floppy: E3 Jumpered                                   
         *Single Speed Floppy: (no Jumper)                                 
                                                                           
      E5: Hard Drive Support:  This jumper is hard-wired on the back of    
                               the pcboard.  To disable the hard drive,    
                               the trace must be cut (this voids the Mfr.  
                               warranty).  To re-enable hard drive support,
                               E5 must be jumpered.                        
                                                                           
    Ŀ NOTES Ķ
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
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