Kenneth D. Merry 4464fee503 Don't allow immediate values of 0 for operations that can take either an
immediate value or the accumulator.  0 is the chip's internal
representation for the accumulator, and so 0 is an invalid immediate value
when the accumulator can also be specified as an argument.

Submitted by:	gibbs
2001-04-04 22:50:57 +00:00
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