VDU 31,x,y
This VDU moves the text cursor to (x,y). (0,0) is top left of current text window. If (x,y) is outside text window, nothing happens, unless scroll protection is enabled and x = maxx+1 => cursor is moved to (x-1,y), and a pending newline is generated.
In VDU 5 mode the graphics cursor is moved to (x char spacing * x, y char spacing * y), which can result in the cursor being moved outside the graphics window.
As there are 8 pixels per character in the system font the limitation of 1 byte text coordinates means that the highest graphics resolution that can be fully supported by RISC OS is 2048 by 2048.
Current text cursor position can be read with OS_Byte 134
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