Difference between revisions of "OSBYTE &72"
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m (Added Integra-B info.) |
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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: | |
| − | X=255 never use shadow memory | + | X=255 never use shadow memory even if MODE > 127 |
| − | This OSBYTE is called by the '''*SHADOW''' command | + | 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 &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 | ||
| Line 20: | Line 22: | ||
* http://mdfs.net/Docs/Comp/BBC/Osbyte00 | * http://mdfs.net/Docs/Comp/BBC/Osbyte00 | ||
| − | [[User: | + | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 20:31, 3 April 2015 (UTC) |
Revision as of 22:31, 3 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
This OSBYTE is called by the *SHADOW command.
See Also
- OSBYTE &49 - Check for Integra-B shadow memory
- OSBYTE &6C - Select Master/Integra-B 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
