Difference between revisions of "OSBYTE &72"

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[[Category:OSBYTE]]
 
[[Category:OSBYTE]]
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OSBYTE &72 (114) - Specify video memory to use on next MODE change
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OSBYTE &72 (114) - Write to Shadow/Main toggle
  
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         X=0 force use of shadow memory on future MODE changes
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         X=0 force use of shadow memory on future mode changes
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         X=1 only use shadow memory if MODE number is > 127
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         X=1 only use shadow memory if mode number is > 127
 
     (Solidisk ROM/RAM Extension)
 
     (Solidisk ROM/RAM Extension)
 
         X=255 never use shadow memory
 
         X=255 never use shadow memory
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This OSBYTE is called by the '''*SHADOW''' command on the BBC B+ and Master.
 
  
 
==See Also==
 
==See Also==
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* [[OSBYTE &6C]] - Select Master shadow memory
 
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* [[OSBYTE &6F]] - Select BBC B shadow memory
 
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* [[OSBYTE &70]] - Select memory for Master VDU access
 
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* [[OSBYTE &71]] - Select memory for Master video display
 
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* [[OSBYTE &72]] - Select future use of shadow memory
 
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* [[OSBYTE &73]] - Select shadow bank
 
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* [[OSBYTE &74]] - Check for Solidisk shadow memory
 
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* [[Paging in video memory]]
 
 
* http://mdfs.net/Docs/Comp/BBC/Osbyte00
 
* http://mdfs.net/Docs/Comp/BBC/Osbyte00
  
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[[User:WikiSysop|WikiSysop]] 00:24, 29 August 2013 (BST)
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[[User:Jgharston|Jgharston]] 21:51, 26 May 2009 (UTC)

Revision as of 01:13, 8 March 2015

OSBYTE &72 (114) - Write to Shadow/Main toggle 

       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

See Also

Jgharston 21:51, 26 May 2009 (UTC)

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