Difference between revisions of "OSWORD &5F"

From BeebWiki
Jump to: navigation, search
m (1 revision)
(update)
Line 1: Line 1:
 
[[Category:OSWORD]]
 
[[Category:OSWORD]]
OSWORD &5F (95 ) - "Monitor reads across tube" BBC Soft
+
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)