Difference between revisions of "OSWORD &5F"
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| − | OSWORD &5F (95 ) - | + | 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 | ||
Revision as of 14:37, 8 March 2015
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
Jgharston 13:12, 26 May 2009 (UTC)
