Register parameters
RST 20H, DEFW $27
IN:
A = character to be written
OUT:
Fc = 0 always (error handler is never provoked)
Registers changed after return:
A.BCDEHL/IXIY same
.F....../.... different
Notes
OS_Out may also be used to write screen driver codes by writing them in a series of OS_Out sequences, eg. 1, '2', '+', 'B' to switch on bold typeface.