OS_Out, write character to standard output

RST 20H, DEFB $27

IN:

     A = character to be written

     Fc = 0 always (error handler is never provoked)

     A.BCDEHL/IXIY same
     .F....../.... different

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.

Related calls:

GN_Nln, send newline (CR/LF) to standard output
GN_Soe, write string at extended address to standard output
GN_Sop, write string to standard output, local memory