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This article is related to the preceding article and describes the control of the display in the latter to provide variable size, together with variable function.
English (United States)
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Variable Size Character Display
This article is related to the preceding article and describes the control of the
display in the latter to provide variable size, together with variable function.
The figure is a block diagram of the control logic. The Character Counter is
used to address the Character Buffer when characters and attributes are loaded
into the Line Buffers. The address range over which this counter runs is set by
fixed decoder values which reset the counter to fixed reset values. The
appropriate decoder is selected by the value stored in the Display Size Register
and also the Data Type Register. The outputs of the decoders control the frame
sync pulse to the display. The Data Type Register also controls the
incrementing of the Character Counter to allow for when the display is run in
basic or extended function mode.
Therefore, the Display Size Register and Data Type Register control the
screen size (i.e., the number of lines displayed) and the function of the display,
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