usage : grc128 [ on ]  [ off ] [ // ] [ ? ]

grc128 is a resident grafic extension to the C128 under CPM and/or
Z3Plus.It resided into high memory and takes about 6k of RAM.

     1)  grc128
                       loads grafic extension

     2)  grc128 on
                       same as 1)

     3)  grc128 off
                       removes grafic extension and frees memory

     4)  grc128 //
                       dispays this help screen

     5)  grc128 ?
                       same as 4)

See include files to study usage of grafic routines from TURBO-PASCAL,
PASCAL MT+, SMALL C, FTL MODULA II, and ASSEMBLER.
