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This technique solves the problem of knowing when the current scan line of a character has been completed in a scanned display for characters of different widths, such as proportionally spaced characters.
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Character Width Indicator For Scanned Displays
This technique solves the problem of knowing when the current scan line of
a character has been completed in a scanned display for characters of different
widths, such as proportionally spaced characters.
On display systems which convert characters to a dot matrix and then
present this information serially to the display device, it is necessary to know
when the bits representing the dots have been totally shifted out of the parallel in
serial out (PISO) register. For a horizontally scanned screen, the last column in
the character dot matrix is blank to provide intercharacter spacing. Similarly,
the last row of the character dot matrix is blank in the case of a vertically scanned
screen to provide interline spacing. This technique utilizes the blank column or
row in each character in conjunction with a decoding technique to indicate to the
display system that the last bit to be shifted out to the display device has been
As shown in the figure, the bits are loaded out of the character generator
memory to the PISO register, and are then shifted out via the shift clock to the
display device. As each bit is shifted out to the display device, a one is shifted
into the PISO following the last bit of the byte that was originally loaded into the
PISO from the character generator memory. A decoder is connected to the
PISO to become active when the PISO contains the value "111...10", a unique
decode. This decode signal...