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Register parameters

Code Block

language	none
title	RST 20H, DEFW DEFB $90

IN:
  BHL = extended pointer to string to be written (not crossing segments)
  B = 0, then local address space pointer in caller bank binding

OUT:
   Fc = 0 always (error handler is never provoked)
   HL points at byte after null-terminator

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

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