OSBYTE &72

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OSBYTE &72 (114) - Specify video memory to use on next MODE change

   On entry:
       X=0 force use of shadow memory on future MODE changes
       X=1 only use shadow memory if MODE number is > 127
   Solidisk ROM/RAM Extension:
       X=255 never use shadow memory even if MODE > 127
   On exit:
       X=previous setting

This OSBYTE is called by the *SHADOW command.

See also

Jgharston (talk) 01:13, 4 April 2015 (UTC)