Routines
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11547: THE 'NUMERIC' SUBROUTINE
Used by the routines at OUT_SP_2, ALPHANUM, DEC_TO_FP and STK_DIGIT.
This subroutine returns with the carry flag reset if the present value of the A register denotes a valid digit.
Input
A Character code
Output
F Carry flag reset if the character is a digit (0-9)
NUMERIC 11547 CP "0" Test against 48, the code for '0'.
11549 RET C Return if not a valid character code.
11550 CP 58 Test against the upper limit.
11552 CCF Complement the carry flag.
11553 RET Finished.
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