OS_Prt, Send character directly to printer filter

Register parameters

RST 20H, DEFB $24
     A = character to be written to printer filter

OUT, if call successful:
     Fc = 0
OUT, if call failed:
     Fc = 1
     A = error code:
          RC_ESC ($01), escape detected
          RC_WP, write protected

Registers changed after return:
     ..BCDEHL/IXIY same
     AF....../.... different


It is generally preferred to open a channel to the printer filter and use the usual routines.

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