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OS_ScreenMode (Rev #2)
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_ScreenMode
OS_ScreenMode
(SWI &65)
| Entry | |
|---|---|
| R0 | Reason code |
| All other registers dependent on reason code | |
| Exit | |
|---|---|
| R0 | Preserved |
| All other registers dependent on reason code | |
Use
The purpose of this call is to perform miscellaneous operations for screen mode handling.
Notes
The action performed depends on the reason code value in R0.
Reason Codes
| # | Hex # | Action |
|---|---|---|
| 0 | &00 | Select screen mode |
| 1 | &01 | Return current screen mode |
| 2 | &02 | Enumerate screen modes |
| 3 | &03 | Internal use only |
| 4 | &04 | Configure acceleration |
| 5 | &05 | Flush screen memory from cache |
| 6 | &06 | Force flush screen memory from cache |
| 7 | &07 | Return number of screen banks |
| 8 | &08 | Select display bank |
| 9 | &09 | Select VDU bank |
| 10 | &0A | Copy screen bank |
| 11 | &0B | Select display device |
| 12 | &0C | Read details about display device? |
| 13 | &0D | Convert mode string to mode specifier |
| 14 | &0E | Convert mode specifier to mode string |
| 15 | &0F | Select screen mode by string |
The following codes are used by RISC OS Select’s video driver interface and are unimplemented in RISC OS 5:
| # | Hex # | Action |
|---|---|---|
| 253 | &FD | Read maximum display driver |
| 254 | &FE | Deregister display driver |
| 255 | &FF | Register display driver |
See also
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