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Register parameters

Code Block
titleRST 20H, DEFW DEFB $27
     A = character to be written
     Fc = 0 always (error handler is never provoked)

Registers changed after return:
     A.BCDEHL/IXIY same
     .F....../.... different


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
OS_Bout, write null-terminated string block at (B)HL to standard output
OS_Pout, write embedded null-terminated string at caller (PC) to standard output