OSWORD &5F

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OSWORD &5F (95) - Read/write I/O memory across Tube (BBC Soft/ISMEC Monitor)

   On entry:
       XY?0  =command: 0=read, 1=write
       XY!1  =I/O memory address, b16-b31 ignored
       XY?5  =byte to write when writing
       XY?6  =ROM number or 128 for shadow screen
   On exit:
       XY?5  =byte read when reading

See Also

http://mdfs.net/Docs/Comp/BBC/Oswords

Jgharston 13:12, 26 May 2009 (UTC)

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OSWORD