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Output display apparatus
| Details |
Inventors: Ishii, Hiroshi;
Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)
Primary Examiner: Yusko; Donald J.
Assistant Examiner: Brier; Jeffery A.
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett & Dunner
An apparatus stores one set of dots which represents a graphic pattern and a second set of dots which represents an alphanumeric pattern. According to a distinction code, the patterns are either combined in an OR-WRITE mode, in which the two patterns are logically added in a common portion, or in an OVER-WRITE mode, in which the second pattern replaces the first pattern in the common portion. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An output apparatus according to an embodiment of the invention will now be described with reference to the accompanying drawings.
FIG.
3 is a block diagram of the preferred embodiment of this invention.
In FIG.
3, Central Processing Unit 1 (hereinafter referred to simply as "CPU") for controlling the entire output operation is provided.
To this CPU 1 is connected an output section 2 including a printer, a display, or the like, whose output section has a page memory 8 capable of storing dot patterns corresponding to one page.
When address signals for designating the row and column addresses (hereinafter, the row and column addresses of the page memory 8 are collectively referred to simply as "addresses") of the page memory 8, as well as a read signal, are supplied from CPU 1 to the output section 2, dot data indicating the state of a dot corresponding to the addresses designated in the output section 2 is read and transferred to CPU 1.
A dot to be output is conventionally a "1" and a dot which is not output (i.
e.
, displayed or printed) is conventionally a "0" when the address signals of the page memory 8, the dot data and a write signal are supplied from CPU 1 to the output section 2, the dot data is written into the location corresponding to the addresses designated in the output section 2, so that the state of the dot in said location is refreshed.
Further, when an output command signal is supplied from CPU 1 to the output section 2, the dot data in the page memory 8 is output and the corresponding printing or display is effected.
Also connected to CPU 1 is a document buffer 3 in which there are stored character data of the whole document, the character data consisting of code data of characters and graphics and OR/OVER distinction codes used to designate "OR-WRITE" or "OVER-WRITE".
When a page number signal is supplied from CPU 1 to the document buffer 3, the character data in the corresponding page is transferred to CPU 1.
A page buffer 4 storing character data corresponding to one page, and an OR/OVER register 5 storing OR/OVER distinction codes separated from the character data, are also connected to CPU 1
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