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09860: THE 'SCANNING ALPHANUMERIC' ROUTINE
Used by the routine at SCANNING.
Input
A Code of the current character
S_ALPHNUM 09860 CALL ALPHANUM Is the character alphanumeric?
09863 JR NC,S_NEGATE Jump if not a letter or a digit.
09865 CP "A" Now jump if it is a letter; otherwise continue on into S_DECIMAL.
09867 JR NC,S_LETTER
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