System for controlling printers having differing dot densities

Details System for controlling printers having differing dot densities System for controlling printers having differing dot densities

1988-02-19

1992-03-03

Harkcom, Gary V.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

395110, 395139, 395151, 340735, G06F 1562

Patent

active

050939033

ABSTRACT:
A font converting device converts (dot density conversion) a down-line load font received through an interface device into a font represented by a dot matrix of the same size as that of a resident font stored in first memory and stores the converted down-line load font in a second memory. A control circuit selectively reads the fonts of the first memory (resident font) or the fonts of the second memory (converted down-line load font) in conformity to a font code included in print data, edits dot image data, and then provides the same to a printing unit to be controlled, namely, a printer in a narrow sense. Only the rarely used down-line load font is subjected to dot density conversion so that the print dot density of the converted down-line load font coincides with that of the print dot density of the printer to be controlled, while a frequently used font of a print dot density coinciding with that of the printer is stored as resident font. Thus, a plurality of printers differing from each other in print dot density can be connected to the host unit of a system in the same interface conditions without entailing the variation of character pattern and the size of print area.

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Nigel Davies, "Basic Printers", vol. 28, No. 1, Jan./Feb. 86, pp. 24-25.
Hewlett Packard, "Technical Reference Manual", Laserjet 2000 Printer, First Edition, May 1987, Copyright 1987, Hewlett-Packard Co.

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