Difference between revisions of "OSBYTE &72"

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[[Category:OSBYTE]]
 
[[Category:OSBYTE]]
OSBYTE &72 (114) - Write to Shadow/Main toggle
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{{PageTitle|OSBYTE &72 (114) - Specify video memory to use on next MODE change}}
  
         X=0 force use of shadow memory on future mode changes
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    On entry:
         X=1 only use shadow memory if mode number is > 127
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         X=0 force use of shadow memory on future MODE changes
    (Solidisk ROM/RAM Extension)
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         X=1 only use shadow memory if MODE number is > 127
         X=255 never use shadow memory
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      Solidisk ROM/RAM Extension:
 +
         X=255 never use shadow memory even if MODE > 127
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    On exit:
 +
        X=previous setting
  
==See Also==
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This OSBYTE is called by the '''*SHADOW''' command.
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==See also==
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* [[OSBYTE &49]] - Check for Integra-B shadow memory
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* [[OSBYTE &6C]] - Select Master/Integra-B shadow memory
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* [[OSBYTE &6F]] - Select Aries/Watford 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
  
[[User:Jgharston|Jgharston]] 21:51, 26 May 2009 (UTC)
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[[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)