The invention provides a method of operation of a stable memory circuit having two stable memory banks (bank 0, bank 1). Each bank may comprise one or more VRAMs (1). A stable memory operation involves writing from a source location (6) in a VRAM to a temporary location (5) in the same VRAM and subsequently writing the data from the temporary location (5) to a destination location (10) in the same VRAM. This allows stable memory operations to be carried out very quickly because communication between memory devices is not required.
