(57) An improved display control system is disclosed which is capable of reducing the
time necessary for executing its display operation. In this display control system,
when a display memory (4) is to be accessed, its software supplies values of the X,
Y coordinates of a display screen and these values are then converted into the physical
addresses of the memory (4). For this purpose, a limit check function (33) is provided.
Also, an X register (30) for setting up values on the X coordinate in a display unit
(3A) may be formed by a counter, thereby eliminating the need for setting the values
on the X coordinate each time.
The display control system may also be capable of dealing with the change of a plurality
of screen configurations in the above-mentioned X, Y coordinate system.
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