| Entry | |
|---|---|
| R1 | 137 (&89) |
| R2 | Mode number |
| R3 | Monitor type |
| Exit | |
|---|---|
| R1 | Preserved to pass on (do not claim) |
| R2 | Preserved (do not claim) |
| R3 | Preserved (do not claim) |
This service is issued when a mode change about to take place (or after Service_PreReset).
This service must not be claimed.
It is intended to be used by modules that claim PaletteV for particular combinations of mode and monitor.