OSBYTE &73

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OSBYTE &73 (115) - Select shadow RAM bank used

       X=0 Shadow bank 8
       X=1 Shadow bank 9
   (Electron OS only)
   Blank/restore palette
   X=0  restores the palette
   X<>0 sets the whole palette to black if is high resolution mode
   Software using NMIs in high res modes can prevent snow appearing on the
   screen during NMIs (due to ULA reuse) by blanking the palette

See Also

http://mdfs.net/Docs/Comp/BBC/Osbyte00

Jgharston 21:52, 26 May 2009 (UTC)

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OSBYTE