Register parameters
RST 20H, DEFW $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.