SS.AScrn Set Status
From NitrOS-9
Allocates and maps a high-resolution screen into an application address space.
| Entry Conditions | |
| A | path number |
| B | SS.AScrn ($8B) |
| X | screen type |
| 0 = 640 x 192 x 2 colors (16K) | |
| 1 = 320 x 192 x 4 colors (16K) | |
| 2 = 160 x 192 x 16 colors (16K) | |
| 3 = 640 x 192 x 4 colors (32K) | |
| 4 = 320 x 192 x 16 colors (32K) | |
| Exit Conditions | |
| X | application address space of screen |
| Y | screen number (1-3) |
| Error Output | |
| CC | carry set on error |
| B | error code |
Additional Information
- SS.AScrn is particularly useful in systems with mininal memory when you want to allocate a high resolution graphics screen with all screen updating handled by a process.
- All screens are allocated in multiples of 8K blocks. You can allocate a maximum of three buffers at one time. To select between buffers, use the SS.DScrn SetStat call.
- Screen memory is allocated but not cleared. The application using the screen must do this.
- Screens must be allocated from a VDG-type device—a standard 32-column text screen must be available for the device.
- This call uses VDGInt (GrfInt is not required).
- The support module for this call is VDGInt.
