Difference between revisions of "OSBYTE &75"
m (Added See Also.) |
m (Bit 4 is also used on the BBC B+.) |
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| Line 12: | Line 12: | ||
b7 Screen disabled with VDU21 | b7 Screen disabled with VDU21 | ||
| − | Note, bit 4 is only set by shadow screen modes on the Master series. With | + | Note, bit 4 is only set by shadow screen modes on the Master series and the |
| − | + | BBC B+. With shadow screen systems on the BBC B and Electron a different flag | |
| + | is used. | ||
==See also== | ==See also== | ||
Latest revision as of 08:46, 28 December 2016
OSBYTE &75 (117) - Read VDU Status Byte
On exit:
X=b0 Print output enabled by VDU2
b1 Scrolling disabled
b2 Paged scrolling selected by VDU14
b3 Text window in force, ie software scrolling
b4 In a shadow mode on Master
b5 In VDU5 mode
b6 Cursor editing in progress
b7 Screen disabled with VDU21
Note, bit 4 is only set by shadow screen modes on the Master series and the BBC B+. With shadow screen systems on the BBC B and Electron a different flag is used.
See also
- OSWRCH
- 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
Jgharston 21:53, 26 May 2009 (UTC) Jgharston (talk) 20:33, 3 April 2015 (UTC)
