GN_Cls, classify character

RST 20H, DEFW $3009

IN:

     A = character to classify

     F = flags indicate classification, as follows:
          Fc = 0, Fz = 0: Neither alphabetic or numeric
          Fc = 0, Fz = 1: Numeric ('0' ... '9')
          Fc = 1, Fz = 0: Upper case letter ('A' ... 'Z')
          Fc = 1, Fz = 1: Lower case letter ('a' ... 'z')

     A.BCDEHL/IXIY same
     .F....../.... different

Bugs:
 

Related calls:

GN_Skc, skip character
GN_Skd, skip delimiters
GN_Skt, skip to value