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OS_ReadSysInfo 1 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_ReadSysInfo 15 – SWI Calls
» OS_ReadSysInfo 1OS
» OS_ReadSysInfo
» OS_ReadSysInfo 1
OS_ReadSysInfo 1
(SWI &58)
| Entry | |
|---|---|
| R0 | 1 |
| Exit | |
|---|---|
| R0 | Screen mode (mode number or Mode Selector Block) |
| R1 | Monitor type |
| R2 | Sync: |
| 0 = Vertical | |
| 1 = Composite |
Use
The purpose of this call is to read the configured Mode/WimpMode, MonitorType, and Sync settings.
Notes
If any of the settings have been configured to ‘Auto’, then the appropriate value for the attached monitor is returned.
Automatic selection of settings is a three-stage process:
- First, Service_MonitorLeadTranslation is issued. If the service call is claimed then the settings returned by that call will be used.
- If the service call failed, the kernel will use its builtin translation table to select the settings.
- Additionally, from RISC OS 5.21 onwards, if the service call fails then the mode number selected from the kernel’s builtin table may also be overridden by the current GraphicsV driver via the Select startup mode call.
In all cases, only the settings which were set to ‘Auto’ in CMOS will be overridden by the automatic selection logic.
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