Electronic typographic apparatus

Details Electronic typographic apparatus Electronic typographic apparatus

G - Physics

06

F

375/32

G06F 3/14 (2006.01) G09F 9/00 (2006.01)

Patent

CA 1072693

ELECTRONIC TYPOGRAPHIC APPARATUS ABSTRACT OF THE DISCLOSURE An electronic typographic apparatus includes a multiline display, the top of the display being justified and the lower line constituting a data entry line. Coded typographic data is stored in a character memory, the dot format for the display of charac- ters in different scan lines being produced upon application of stored character data to character generating read only memories. The data entry position of the data entry line of the display is stored and new data is entered into the character memory with counting circuits being employed to keep track of the data entry line and position. The display is "rolled up" one line upon receipt of a carriage return signal, and in the backspacing function, stored data is deleted. Backspacing may proceed into a line previously rolled up, in which case all of the lines are rolled down. The characters are displayed with proportional widths, as a function of a Character Clock signal generated from a read only memory instantaneously responsive to coded signals of the character memory just prior to the display of elements of a character. Word spaces of the top line of the display are counted to develop justification data for justifying the top display line, the justification data being stored in a separate memory and "stretching" the word spaces of the top display line by inhibiting the character clock, while the display scan continues, for the determined periods. Once justification is complete, the afore- mentioned determined periods are digitized and directed to the hard copy printing device to define the amount of "stretching" required. Tab stops are stored in a separate memory, and a cir- cuit responsive to a tab signal stored in the character memory also inhibits continuation of the character clock signal until a tab stop signal is received from the tab stop memory. -1a-

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