=> R0 = 22
R1 = pointer to five-byte buffer:
0 Type
1 Un-aligned word containing new screen offset.
This SWI sets up a new screen base address. It is given as the offset from the base of the screen. Offset must be divisible by 16.
Note: This does not appear to work on RISC OS 3.60.
Screen base address types
Bit Meaning if set
0 Set screen base used by VDU
1 Set screen base used by hardware
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