VDU 30 moves the cursor to its home position.
The home position is usually the top left of the window, but this may be altered with VDU 23,16.
In VDU 4 mode the text cursor is homed, in VDU 5 mode the graphics cursor. The actual location of the graphics mode home position may be up to (char size - 1) pixels out from the corner in one or both axes depending on the direction of character printing.
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