Difference between revisions of "OSBYTE &72"
m (Added Integra-B info.) |
m (Added return value.) |
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| Line 7: | Line 7: | ||
Solidisk ROM/RAM Extension: | 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: | ||
| + | X=previous setting | ||
This OSBYTE is called by the '''*SHADOW''' command. | This OSBYTE is called by the '''*SHADOW''' command. | ||
| − | ==See | + | ==See also== |
* [[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 | ||
| Line 22: | Line 24: | ||
* http://mdfs.net/Docs/Comp/BBC/Osbyte00 | * http://mdfs.net/Docs/Comp/BBC/Osbyte00 | ||
| − | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) | + | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 01:13, 4 April 2015 (UTC) |
Revision as of 02:13, 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
