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OS_Out, write character to standard output
OS_Sout, write local string to standard output
OS_Bout,write string at (B)HL to standard output
OS_Pout, write embedded null-terminated string at caller (PC) to standard output
OS_Hout, write hexadecimal byte to standard output
OS_Nln, send newline (CR/LF) to standard output
GN_Sop, write local string to standard output
GN_Soe, write string at extended address to standard output
GN_Nln, send newline (CR/LF) to standard output