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This article is related to the one published on pages 1200-1201 of this issue which describes the blocks in the figure. Here a single linear address is used to simplify the refresh hardware.
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Page 1 of 2
Refresh Logic Control
This article is related to the one published on pages 1200-1201 of this issue
which describes the blocks in the figure. Here a single linear address is used to
simplify the refresh hardware.
Normally, character displays have a row counter and an X counter. These
then have to be converted into a 'one-dimensional address' to address the
Character Buffer. Alternatively, if the Row and X counters are used to directly
address the Character Buffer, then the Character Buffer will not be efficiently
used unless the X counter is of the form 2/n/, where n is a whole number.
This is because there will be gaps in the storage, as this is addressed in a
pure binary manner.
To reduce the hardware required and use the Character Buffer efficiently, the
address used by the refresh logic to read the character codes out of the
Character Buffer is a one-dimensional linear address. This address is
incremented every time that a character is read out into the Line Buffer. The
counter is reset at the end of each frame.
This same counter is used by control logic to decode the end of the frame.
Page 2 of 2
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