type:  Address decoder PAL
code:  A75507 (AMPRO part no.)
date:  
style: 10L8 PAL
use:   Ampro Z80 Little Board Plus (model 1B)

notes: this is truth table for the PAL that performs address decoding
       on the Ampro Z80 Little Board Plus (model 1B - onboard SCSI).
       The data needs to be converted into a suitable PAL/GAL listing.
       Any volunteers?

*********************************************************************
 WARNING!
 The following truth table was obtained by manually setting the PAL
 inputs and measuring the outputs.  While the data is believed to be
 correct, it has NOT yet been tested in practice.  Use at your own
 risk.
*********************************************************************

Address Decoder PAL (part no. A75507) for AMPRO Z80 Little Board Plus

 1. Truth Table for 10L8 PAL


        OUTPUT                          INPUTS

                      IORQ*  RD*  WR*  A7   A6   A5   A4   A3   A0

        G1*             0    -    0    0    0    0    0    0    -

        G2*             0    *    *    -    -    -    -    -    -

        IDRD*           0    0    -    0    0    1    0    1    1

        NCRCS*          0    *    *    0    0    1    0    0    -

        NCRDACK*        0    *    *    0    0    1    0    1    0

        IORD*           0    0    -    -    -    -    -    -    -

        IOWR*           0    -    0    -    -    -    -    -    -


        1       logic level high or one (+5v).
        0       logic level low or zero (0v).
        -       may assume either logic state.
        *       either RD* or WR* (or both) must be at logic
                zero for the indicated output to go low.

 2. Pinouts for 10L8 PAL

                1       gnd             11      A6
                2       IORQ*           12      G1*
                3       RD*             13      G2*
                4       WR*             14      not connected
                5       A0              15      IORD*
                6       A3              16      NCRCS*
                7       A4              17      IDRD*
                8       A5              18      IOWR*
                9       A7              19      NCRDACK*
                10      gnd             20      +5v


Note: designators ending with '*' indicate they are active-low.

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