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Comment: Adjust output register API (one char)

...

Code Block
titleRST 20H, DEFB $93
IN:
   -

OUT:
   Fc = 0 always (error handler is never provoked)

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

Notes

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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_Out, write character to standard output