Routines
Prev: 2C02 Up: Map Next: 2C8D
2C88: 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 2C88 CALL NUMERIC Test for a digit; carry will be reset for a digit.
2C8B CCF Complement the carry flag.
2C8C RET C Return if a digit; otherwise continue on into ALPHA.
Prev: 2C02 Up: Map Next: 2C8D