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SYNTAX      [<LABEL>] ZAC

OPERANDS    None

EXECUTION   (PC) + 12 . PC
            0 . ACC

DESCRIPTION The contents of the accumulator are replaced with zero. The
            ZAC instruction has been implemented as a special case of LACK
            (ZAC assembles as LACK 0).

WORDS       1

ENCODING    15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
            +-----------------------------------------------+
            |1  1  0  0  1  0  1  0  0  0  0  0  0  0  0  0 |
            +-----------------------------------------------+

CYCLES

            +------------------------------------------------+
            |    Cycle Timings for a Single Instruction      |
            |------------------------------------------------|
            | PI/DI | PI/DE | PE/DI | PE/DE  | PR/DI | PR/DE |
            |-------+-------+-------+--------+-------+-------|
      '20   |   1   |   1   |  1+p  |  1+p   |   -   |   -   |
            |-------+-------+-------+--------+-------+-------|
     'C25   |   1   |   1   |  1+p  |  1+p   |   1   |   1   |
            |------------------------------------------------|
            |    Cycle Timings for a Repeat Instruction      |
            |------------------------------------------------|
      '20   |          not repeatable        |   -   |   -   |
            |------------------------------------------------|
     'C25   |                 not repeatable                 |
            +------------------------------------------------+



EXAMPLE     ZAC

                       BEFORE          AFTER

              ACC X >A5A5A5A5       ACC X >0
                  C                     C
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