
    ͻ
      Western Digital, Inc.                                  WD1003-MM1,2  
    ͹
                                                                           
                       J6       J3     J4      J5      J1(MM2)             
      J1: Floppy     Ŀ       
      J3: HD1 Data   ....     1::::  1::::  1::::::  1::::::            
      J4: HD0 Data                                                      
      J5: HD Control               W1 ::::        .. W3                 
      J6: HD LED                                  .. W4                 
                                                  .. W5                 
                                                                        
                                                         W6 :           
                     Ŀ       ڿ            ٺ          
                                                   
      INTERFACE: ISA(AT)->ST506/412(MFM)                                   
      CONTROLS:  2 Floppy Drives (MM2 only; 360KB, 720KB, 1.2MB, 1.44MB)   
                                                                           
      W1: 1-2: Hard Drive Mode:  OFF: Latched Mode                         
                                 *ON: Non-Latched Mode                     
                                                                           
          3-4: Error Correction Code (ECC), 4-byte:  *OFF: Enabled         
                                                       ON: (Reserved)      
                                                                           
          5-6: Caching:  *OFF: Caching Enabled                             
                           ON: Caching Disabled                            
                                                                           
          7-8: WD1003-WA2,WAH Compatibility for     OFF: Incompatible      
               Drives with 8 or more heads:          ON: Compatible        
                                                                           
      W3: Hard Drive I/O Address:  *OFF: Primary address                   
                                     ON: Secondary address                 
                                                                           
      W4: Floppy Drive I/O Address:  *OFF: Primary address                 
                                       ON: Secondary address               
                                                                           
      W5: Floppy Speed Support:   OFF: Single Speed Drives only            
                                   ON: Dual Speed Drives only              
                                                                           
      W6: Bracket Grounding Option:  *OFF: Bracket not grounded            
                                       ON: Bracket grounded                
                                                                           
    Ŀ Additional Info Ķ
                                                                           
         W1:7-8 Addresses a disparity between the MMx series and the WA2/  
      WAH series concerning heads #8-15.  When replacing a WA2/WAH series  
      with an MMx series on drives with over 8 physical heads, this jumper 
      is required to maintain compatibliity.                               
         There is no Low Level Formatting routine contained on this card.  
      A third-party LLF software program is required, ie; The IBM AT       
      Advanced Diagnostics, KOLOD Research Utilities, or Western Digital   
      AT Low Level Formatter (found on WD's BBS).                          
         Do NOT mix single-speed and Dual-speed Floppy drives on the same  
      controller.                                                          
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