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  1. Apple II
  2. Technical Notes
  3. _____________________________________________________________________________
  4.                                                   Developer Technical Support
  5.  
  6.  
  7. Apple II Miscellaneous
  8. #6:    IWM Port Description
  9.  
  10. Revised by:    Glenn A. Baxter                                  November 1988
  11. Written by:    Cameron Birse                                    February 1986
  12.  
  13. This Technical Note documents the IWM port pin assignments on various 
  14. machines.
  15. _____________________________________________________________________________
  16.  
  17. Apple IIGS Disk Port Pin Assignments
  18.  
  19.             Signal Name    Disk Port Pins (DB-19)
  20.             Phase 0                11
  21.             Phase 1                12
  22.             Phase 2                13
  23.             Phase 3                14
  24.             /WReq                  15
  25.             Dr1                    17
  26.             Rd                     18
  27.             Wr                     19
  28.             Wrt Prot               10
  29.             Dr2                     9
  30.             HeadSel                16
  31.             Gnd                 1,2,3
  32.             3.5Disk                 4
  33.             -12v                    5
  34.             +5v                     6
  35.             +12v                  7,8
  36.  
  37. Apple IIe UniDisk 3.5 Controller Disk Port Pin Assignments
  38.  
  39.             Signal Name    Disk Port Pins (DB-19)
  40.             Phase 0                11
  41.             Phase 1                12
  42.             Phase 2                13
  43.             Phase 3                14
  44.             /WrtReqII              15
  45.             /HstEnbl               17
  46.             Rd                     18
  47.             Wr                     19
  48.             Wrt Prot               10
  49.             No Connection        9,16
  50.             Gnd               1,2,3,4
  51.             -12v                    5
  52.             +5v                     6
  53.             +12v                  7,8
  54.  
  55. Apple IIc Disk Port Pin Assignments
  56.  
  57.             Signal Name    Disk Port Pins (DB-19)
  58.             Phase 0                11
  59.             Phase 1                12
  60.             Phase 2                13
  61.             Phase 3                14
  62.             /WrtReq                15
  63.             /Enbl 2                17
  64.             Rd                     18
  65.             Wr                     19
  66.             Wrt Prot               10
  67.             No Connection          16
  68.             Gnd               1,2,3,4
  69.             -12v                    5
  70.             +5v                     6
  71.             +12v                  7,8
  72.             External Interrupt      9
  73.  
  74.             Note:    On the Apple IIc Plus, 
  75.             the disk port pins are driven 
  76.             by a custom ASIC instead of by 
  77.             the IWM chip.
  78.  
  79. Macintosh Disk Port Pin Assignments
  80.  
  81.             Signal Name    Disk Port Pins (DB-19)
  82.             Phase 0                11
  83.             Phase 1                12
  84.             Phase 2                13
  85.             Phase 3                14
  86.             /WrtReq                15
  87.             /Enbl 2                17
  88.             Rd                     18
  89.             Wr                     19
  90.             PWM                    10
  91.             HdSel                  16
  92.             GND               1,2,3,4
  93.             -12v                    5
  94.             +5v                     6
  95.             +12v                  7,8
  96.  
  97.