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A display character box size is enlarged and ROS costs are reduced through the use of combinational logic.
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Selectively Increasing Character Box Size
A display character box size is enlarged and ROS costs are reduced through
the use of combinational logic.
A read-only store (ROS) module used as a character generator can
accommodate a binary multiple of characters, each consisting of a binary
multiple of scan lines. For example, an 8K X 8 ROS module is capable of
handling 512 characters for 8 x 16-bit or - dot character boxes. When slightly
larger character boxes are required, such as 8 x 18 or 8 x 19, using additional
ROS modules is not always an acceptable solution. This is because the
difference in cost between 1K X 8, 2K X 8, 4K X 8, and 8K X 8 ROS modules is
A ROS module is used to transform a set of inputs into outputs. Stored inside
the module is the output information for all possible combinations of inputs. If the
outputs are identical for the majority of the input combinations, then a more cost-
effective solution for increasing character box sizes is to use combinational logic
to transform only those sets of inputs which produce unique outputs.
Consider an 8 x 18-dot box. A determination is first made as to the number
of scan lines in the character box that exceeds the ROS capacity. In this case
there are two. If the bottom two scan lines are chosen, it can be seen that except
for characters with diacritics, underscores, descenders, etc., the information
contained in these two lines is zero for most characters. Thereafter, the address
of the chara...