Difference between revisions of "OSBYTE &72"
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[[Category:OSBYTE]] | [[Category:OSBYTE]] | ||
| − | OSBYTE &72 (114) - | + | OSBYTE &72 (114) - Specify video memory to use on next MODE change |
| − | X=0 force use of shadow memory on future | + | On entry: |
| − | X=1 only use shadow memory if | + | X=0 force use of shadow memory on future MODE changes |
| − | + | X=1 only use shadow memory if MODE number is > 127 | |
| − | X=255 never use shadow memory | + | Solidisk ROM/RAM Extension: |
| + | X=255 never use shadow memory even if MODE > 127 | ||
| + | On exit: | ||
| + | X=previous setting | ||
| − | ==See | + | 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 | * http://mdfs.net/Docs/Comp/BBC/Osbyte00 | ||
| − | [[User:Jgharston|Jgharston]] | + | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 01:13, 4 April 2015 (UTC) |
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
- 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
