(57) An image display system comprises a screen (10) on which, in use, an image (I) is
displayed in the form of a plurality of lines (11,12) of information, a plurality
of memory means (14,15) each of which contains information to be displayed on the
screen (10), processing means (16,17) to process an input signal from a CPU (21) and
to write into the memory means (14,15) the information to be displayed, characterised
in that the image (I) is displayed as a plurality of groups of information of N lines
where N is the number of memory means (14,15), each memory means (14,15) storing information
relating to one line (11,12) only of each group of lines.
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