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Write (put) a byte



 6502   Z80   6809   PDP11   80x86   32016   ARM  On entry: On exit:
A A A R0 AL R1 R0 = byte to write   preserved
Y H Y R1 BX R2 R1 = handle preserved

An error is generated is the object is a directory or doesn't have write access. The EOF-error-flag is cleared.

Calling from BBC BASIC

  • BPUT#ch%,b% calls OSBPUT.

Special handles

Some systems allow BPUT#0 to write to the character output stream via OSWRCH.

Entry points

  • BBC BASIC Entry Address: &FFD4
  • 6502 Entry Address: &FFD4, vectors via &0218
  • Z80 Entry Address: &FFD4, vectors via &FFD5
  • 6809 Entry Address: &FFD4, vectors via &FFD5
  • 80x86 Entry Address: INT &42, vectors via 0000:0108
  • 32000 Entry Address: SVC &0E
  • PDP-11 Entry Address: EMT 10, vector &0A
  • ARM Entry Address: SWI &0B "OS_BPut", vector &0B


OSBPUT is implemented by all filing systems that allow writing.

Jgharston 16:57, 6 November 2009 (UTC)