=> R0 = screen mode, or -1 for current
R1 = variable number
<= R2 = value of variable
C is set if variable or mode were invalid
This SWI allows you to read information about a particular mode without having to change into that mode. See also OS_ReadVduVariables.
From RISC OS 3.50 onwards, the mode number in R0 can also be a pointer to mode selector or a sprite's mode word.
See PRM 1, page 709.
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