Macintosh SE

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PLD[edit]

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Recreated GAL16V8 U9D 341-0538-A Tested Porchy Kai ZIP Mac SE 341-0538-A.jpg

Equations[edit]

341-0538-A Equations
pin 1   = CLK;      /* Unused input */
pin 2   = PB6;      /* Input */
pin 3   = IRQ;      /* Input */
pin 4   = WRDATE;   /* Input */
pin 5   = ENABLE1;  /* Input */
pin 6   = PA4;      /* Input */
pin 7   = 16MCLK;   /* Input */
pin 8   = PA3;      /* Input */
pin 9   = RTXNABLW; /* Input */
pin 11  = OE;       /* Input */

pin 12  = RTXCA;    /* Combinatorial output */
pin 13  = OUTA;     /* Input */
pin 14  = BBUIRQ;   /* Fixed low output w/ output enable */
pin 15  = ENABLEL;  /* Combinatorial output */
pin 16  = ENABLEU;  /* Combinatorial output */
pin 17  = FLOPPYWR; /* Combinatorial output */
pin 18  = NC;       /* Unused input */
pin 19  = FCLK;     /* Combinatorial output w/ output enable */

!FCLK     =  16MCLK;
 FCLK.oe   = !OE;

!FLOPPYWR =  WRDATE;

!ENABLEU  = !ENABLE1  & !PA4;

!ENABLEL  = !ENABLE1  &  PA4;

 BBUIRQ   = 'b'0;
 BBUIRQ.oe = !PB6      &  IRQ;

!RTXCA    = !PA3      & !RTXNABLW & !OUTA 
          #  PA3      & !RTXNABLW & !OUTA 
          # !PA3      &  RTXNABLW & !OUTA 
          #  PA3      & !RTXNABLW &  OUTA;

Credits[edit]

  • IC donated by Kai Robinson for reversing