Routines
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11400: THE 'ALPHANUM' SUBROUTINE
Used by the routines at S_ALPHNUM, LOOK_VARS and LET.
This subroutine returns with the carry flag set if the present value of the A register denotes a valid digit or letter.
Input
A Character code
Output
F Carry flag set if the character is alphanumeric
ALPHANUM 11400 CALL NUMERIC Test for a digit; carry will be reset for a digit.
11403 CCF Complement the carry flag.
11404 RET C Return if a digit; otherwise continue on into ALPHA.
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