OS_Byte 114 (changes)
Showing changes from revision #2 to #3:
Added | Removed | Changed
OS SWI Calls
» OS_Byte
» OS_Byte 114
OS_Byte 114
(SWI &06)
| Entry | |
|---|---|
| R0 | 114 (&72) |
| R1 | 0 = modes will be shadow |
| 1 = modes will be non-shadow |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Previous shadow state |
| R2 | Corrupted |
Use
The purpose of this call is to write the shadow/non-shadow state to memory.
Notes
This call determines whether future changes to numbered screen modes will be forced to use shadow state. OS_Byte 112 and OS_Byte 113 control the use of shadow banks.
Shadow state requires twice the amount of RAM than the equivalent non-shadow mode since two copies of the screen are stored in memory.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.