Difference between revisions of "OSBYTE &72"
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[[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: | 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 even if MODE > 127 | X=255 never use shadow memory even if MODE > 127 | ||
On exit: | On exit: | ||
| Line 15: | Line 15: | ||
* [[OSBYTE &49]] - Check for Integra-B shadow memory | * [[OSBYTE &49]] - Check for Integra-B shadow memory | ||
* [[OSBYTE &6C]] - Select Master/Integra-B shadow memory | * [[OSBYTE &6C]] - Select Master/Integra-B shadow memory | ||
| − | * [[OSBYTE &6F]] - Select | + | * [[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 24: | Line 24: | ||
* http://mdfs.net/Docs/Comp/BBC/Osbyte00 | * http://mdfs.net/Docs/Comp/BBC/Osbyte00 | ||
| + | ---- | ||
[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 01:13, 4 April 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
- OSBYTE &49 - Check for Integra-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 &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
