GN_Sop, write string to standard output, local memory

RST 20H, DEFW $3A09

IN:

     HL = pointer to local null-terminated string

     Fc = 0
     HL points to the null

     A.BCDE../IXIY same
     .F....HL/.... different

Strings should not cross bank/segment boundaries or rubbish will be printed from the position of the boundary crossing and onwards.

Related calls:

GN_Nln, send newline (CR/LF) to standard output
GN_Soe, write string at extended address to standard output
OS_Out, write character to standard output