=> R0 = 9
R1 = pointer to five byte block:
0 Two byte x coord.
2 Two byte y coord.
<= R1+4 contains logical colour of specified pixel.
This SWI returns the logical colour at the specified pixel. A value of &FF denotes that the pixel is off the screen or the current mode is text only.
Additionally, from RISC OS 3.50 value &FF is returned for screen modes with 256+ colours.
Don't use this SWI, use OS_ReadPoint
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