Difference between revisions of "OSBYTE &72"

From BeebWiki
Jump to: navigation, search
m (moved OSBYTE 72 to OSBYTE &72)
 
Line 1: Line 1:
 
[[Category:OSBYTE]]
 
[[Category:OSBYTE]]
OSBYTE &72 (114) - Write to Shadow/Main toggle
+
OSBYTE &72 (114) - Specify video memory to use on next MODE change
  
         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
 +
 +
This OSBYTE is called by the '''*SHADOW''' command on the BBC B+ and Master.
  
 
==See Also==
 
==See Also==
 +
* [[OSBYTE &6C]] - Select Master shadow memory
 +
* [[OSBYTE &6F]] - Select BBC B shadow memory
 +
* [[OSBYTE &70]] - Select memory for Master VDU access
 +
* [[OSBYTE &71]] - Select memory for Master video display
 +
* [[OSBYTE &72]] - Select future use of shadow memory
 +
* [[OSBYTE &73]] - Select shadow bank
 +
* [[OSBYTE &74]] - Check for Solidisk shadow memory
 +
* [[Paging in video memory]]
 
* http://mdfs.net/Docs/Comp/BBC/Osbyte00
 
* http://mdfs.net/Docs/Comp/BBC/Osbyte00
  
[[User:Jgharston|Jgharston]] 21:51, 26 May 2009 (UTC)
+
[[User:WikiSysop|WikiSysop]] 00:24, 29 August 2013 (BST)

Revision as of 00:24, 29 August 2013

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

       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

This OSBYTE is called by the *SHADOW command on the BBC B+ and Master.

See Also

WikiSysop 00:24, 29 August 2013 (BST)