Difference between revisions of "OSBYTE &72"

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OSBYTE &72 (114) - Specify video memory to use on next MODE change
 
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=0 force use of shadow memory on future MODE changes
 
         X=1 only use shadow memory if MODE number is > 127
 
         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 even if MODE > 127
 +
    On exit:
 +
        X=previous setting
  
This OSBYTE is called by the '''*SHADOW''' command on the BBC B+ and Master.
+
This OSBYTE is called by the '''*SHADOW''' command.
  
==See Also==
+
==See also==
* [[OSBYTE &6C]] - Select Master shadow memory
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* [[OSBYTE &49]] - Check for Integra-B shadow memory
 +
* [[OSBYTE &6C]] - Select Master/Integra-B shadow memory
 
* [[OSBYTE &6F]] - Select BBC B shadow memory
 
* [[OSBYTE &6F]] - Select BBC B shadow memory
 
* [[OSBYTE &70]] - Select memory for Master VDU access
 
* [[OSBYTE &70]] - Select memory for Master VDU access
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* http://mdfs.net/Docs/Comp/BBC/Osbyte00
 
* http://mdfs.net/Docs/Comp/BBC/Osbyte00
  
[[User:WikiSysop|WikiSysop]] ([[User talk:WikiSysop|talk]]) 13:34, 8 March 2015 (UTC)
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[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 01:13, 4 April 2015 (UTC)

Latest revision as of 03:13, 4 April 2015

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)