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OSBYTE &70 (112) - Select Main/Shadow for VDU access

   Y=0 X=0 Use whatever the default for the current mode is
       X=1 Use main memory
       X=2 Use shadow memory
   (Risc OS 1.00)
   The value of X can be greater than 2 as well, and instructs the VDU
   drivers to use the bank at screenbase+(X*modesize)

See Also

Jgharston 21:45, 26 May 2009 (UTC)