Difference between revisions of "OSBYTE &6C"

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Revision as of 19:12, 8 March 2015

OSBYTE &6C (108) - Main/Shadow RAM access

   Y=0 X=0 Main memory appears from &3000 to &7FFF
       X=1 Shadow memory appears from &3000 to &7FFF

This has immediate effect and allows the user to access the Master's 20K shadow RAM, for instance, to load or save it or manipulate it directly. The memory that is accessed by the VDU drives and displayed can set with OSBYTE &70 and OSBYTE &71.

On the BBC B+ the displayed memory is always the bank selected with MODE or OSBYTE &72, and the user can only access the shadow memory by calling OSRDSC.

See Also

WikiSysop (talk) 13:30, 8 March 2015 (UTC)