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      DATA TECHNOLOGY CORP.                                   DTC-7280     
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           J5                         J4 J3 J2 J1                          
        Ŀ       
         ....                        1: 1: 1: 1:         W4             
                                     :: :: :: ::         ::             
                                     :: :: :: ::         W7             
                                ..         :: ::                        
                                W6         :: ::  W5:::W2               
                                                     |                  
                                                     W3                 
        Ŀ       ڿ            ٺ          
                                                   
       INTERFACE:  ISA(AT)->ST412(RLL)                                     
       CONTROLS:   2 Floppy drives (360K, 720K, 1.2M, 1.44M)               
                   2 Hard Drives                                           
                                                                           
      W2,W3: Port Address Selection                                        
            *1F0-1F7, 3F0-3F7 (Primary Address): (no Jumpers)              
             170-177, 370-377 (Secondary Address: W2, W3 Jumpered          
                                                                           
      W4: Floppy Drive Transfer Rate               J1: Floppy              
          250KHz: W4 Jumpered                      J2: HD Control          
         *500KHz: (no Jumper)                      J3: HD0 Data            
                                                   J4: HD1 Data            
      W5: Drive Select Mode Type                   J5: LED                 
         *Hardware Select Mode: W5 Jumpered                                
          Firmware Select Mode: (no Jumper)                                
                                                                           
      W6: Auto-Deselect Mode                                               
         *Auto-Deselect Mode Enabled: W6 Jumpered                          
          Auto-Deselect Mode Disabled: (no Jumper)                         
                                                                           
      W7: Floppy Precompensation Selection                                 
          Precompensation at 125nSec: W7 Jumpered                          
         *Precompensation Scaled/Freq: (no Jumper)...(125nS@500KHz,        
                                                      208nS@300KHz,        
      * Default Settings                              250nS@250KHz.)       
                                                                           
    Ŀ ADDITIONAL INFO Ķ
                                                                           
     The DTC7280 is a 1:1 interleave RLL controller.  It will run at zero  
     wait states up to a bus speed of 16MHz.   The 7280 does not have an   
     embedded Low Level Format routine, and requires The IBM AT Advanced   
     Diagnostics, or similar 3rd party program for Low Level Formatting.   
     The 7280 is OS/2 compatible.                                          
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
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