Difference between revisions of "OSBYTE &72"

From BeebWiki
Jump to: navigation, search
m (1 revision)
(See Also)
 
(3 intermediate revisions by the same user not shown)
Line 1: Line 1:
 
[[Category:OSBYTE]]
 
[[Category:OSBYTE]]
OSBYTE &72 (114) - Specify video memory to use on next MODE change
+
{{PageTitle|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
+
* [[OSBYTE &49]] - Check for Integra-B shadow memory
* [[OSBYTE &6F]] - Select BBC B shadow memory
+
* [[OSBYTE &6C]] - Select Master/Integra-B shadow memory
 +
* [[OSBYTE &6F]] - Select Aries/Watford shadow memory
 
* [[OSBYTE &70]] - Select memory for Master VDU access
 
* [[OSBYTE &70]] - Select memory for Master VDU access
 
* [[OSBYTE &71]] - Select memory for Master video display
 
* [[OSBYTE &71]] - Select memory for Master video display
Line 20: Line 24:
 
* 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)
+
----
 +
[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 01:13, 4 April 2015 (UTC)

Latest revision as of 19:28, 22 January 2021

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)