Difference between revisions of "OSBYTE &EF"
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[[Category:OSBYTE]] | [[Category:OSBYTE]] | ||
| − | OSBYTE &EF (239) - Read/Write shadow state | + | ===OSBYTE &EF (239) - Read/Write shadow screen state=== |
| − | + | This location is used by various shadow screen memory systems to hold the shadow MODE selection state. | |
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| + | BBC B: | ||
| + | Working value for [[OSBYTE &6F|OSBYTE 111]]. | ||
| + | BBC B+/Master: | ||
| + | *SHADOW/[[OSBYTE &72|OSBYTE 114]] value | ||
| + | 0: shadow screen will be selected on next MODE change | ||
| + | <>0: non-shadow screen will be selected on next MODE change | ||
| + | Electron: | ||
| + | b0=Electron Master RAM Turbo mode (2MHz selected) | ||
| + | b7=Electron Master RAM 64K mode (shadow screen enabled) | ||
==See Also== | ==See Also== | ||
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[[User:Jgharston|Jgharston]] 23:12, 26 May 2009 (UTC) | [[User:Jgharston|Jgharston]] 23:12, 26 May 2009 (UTC) | ||
| + | [[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 22:50, 14 February 2016 (UTC) | ||
Revision as of 23:50, 14 February 2016
OSBYTE &EF (239) - Read/Write shadow screen state
This location is used by various shadow screen memory systems to hold the shadow MODE selection state.
BBC B: Working value for OSBYTE 111. BBC B+/Master: *SHADOW/OSBYTE 114 value 0: shadow screen will be selected on next MODE change <>0: non-shadow screen will be selected on next MODE change Electron: b0=Electron Master RAM Turbo mode (2MHz selected) b7=Electron Master RAM 64K mode (shadow screen enabled)
See Also
Jgharston 23:12, 26 May 2009 (UTC) Jgharston (talk) 22:50, 14 February 2016 (UTC)
