OS_Byte 250 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_Byte 15 – SWI Calls
» OS_Byte 250OS
» OS_Byte
» OS_Byte 250
OS_Byte 250
(SWI &06)
| Entry | |
|---|---|
| R0 | 250 (&FA) |
| R1 | 0 |
| R2 | 255 |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | VDU driver screen bank |
| R2 | Display screen bank (see OS_Byte 251) |
Use
The purpose of this call is to read the screen bank used by the display, as set by OS_Byte 112
Notes
This call should not be used to write the value – doing so would only change the value in memory, without affecting the hardware.
See also
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