OS_Prt, Send character directly to printer filter
Register parameters
RST 20H, DEFB $24
IN: 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
Notes
It is generally preferred to open a channel to the printer filter and use the usual routines.