OS_Sout, Write local string to standard output

Register parameters

IN:
  HL = pointer to local null-terminated string

OUT:
   Fc = 0, always (error handler is never provoked)
   HL = points to the null-terminator

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

Notes

• This call replace GN_Sop. This call is shorter (2 bytes) and performs a significantly faster rendering.
• String can cross bank boundary. When string crosses a bank boundary, the bank number of the next segment is used. This feature fixes weird output in BBC Basic when the string crosses a bank boundary.

Related calls

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