OS_ScreenMode (changes)
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OS SWI Calls
» 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 marked with ¶ are used by RISC OS Select’s video driver interface and are unimplemented in RISC OS 5.
Reason Codes
| # | Hex # | Action |
|---|---|---|
| 0 | &00 | Select screen mode |
| 1 | &01 | Return current screen mode |
| 2 | &02 | Enumerate screen modes |
| 3 | &03 | Change monitor type (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 |
| 12 | &0C | Read details about |
| 13 | &0D | Convert mode string to mode selector block |
| 14 | &0E | Convert mode selector block to mode string |
| 15 | &0F | Select screen mode by string |
| 64 | &40 | Register GraphicsV Device driver |
| 65 | &41 | Start GraphicsV Device driver |
| 66 | &42 | Stop GraphicsV Device driver |
| 67 | &43 | Deregister GraphicsV Device driver |
| 68 | &44 | Enumerate GraphicsV Device drivers |
| 253 | &FD | Read maximum |
| 254 | &FE | Deregister |
| 255 | &FF | Register |
See also
Other languages documentation
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