PAL16L8

The CPC6128 second 64K is controlled by a PAL 16L8 chip.

The following equations were worked out by:

A15OUT = (!X2 & !X1 & A14

    # !X3 & !X2 & A14
    # A15);

!X1 = (!A15 & D7ANDD6 & RESET & !IOWR & D0

    # !X1 & RESET & IOWR
    # !X1 & !D7ANDD6 & RESET
    # !X1 & A15 & RESET);

!X2 = (!A15 & D7ANDD6 & RESET & !IOWR & D1

    # !X2 & RESET & IOWR
    # !X2 & !D7ANDD6 & RESET
    # !X2 & A15 & RESET);

!X3 = (!A15 & D7ANDD6 & RESET & !IOWR & D2

    # !X3 & RESET & IOWR
    # !X3 & !D7ANDD6 & RESET
    # !X3 & A15 & RESET);

!CAS1 = (X3 & !X1 & A15 & A14 & !NCAS & !RAMDIS & !CPU & CAS0

    # !X3 & !A15 & A14 & !NCAS & !RAMDIS & !CPU & CAS0
    # X3 & !X2 & X1 & !NCAS & !RAMDIS & !CPU & CAS0
    # !NCAS & CAS0 & !CAS1);

!CAS0 = (X3 & X2 & X1 & !NCAS & !RAMDIS & CAS1

    # X3 & !X1 & !A15 & !NCAS & !RAMDIS & CAS1
    # !X3 & A15 & !NCAS & !RAMDIS & CAS1
    # !X1 & !A14 & !NCAS & !RAMDIS & CAS1
    # !X3 & !A14 & !NCAS & !RAMDIS & CAS1
    # !NCAS & !RAMDIS & CPU & CAS1
    # !NCAS & !CAS0 & CAS1);

A14OUT = (A15 & A14

    # !X1 & A14
    # X3 & A14);