JPS6352187A - Character generator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a character generator that prevents mismatching with an external tlRK of a host computer or the like.

[Conventional technology]

As a conventional character generator, for example, a character code (for example, J
This system generates character patterns based on ISC6226) and stores them in an image memory to drive a printer or display them on a display.

According to this character generating device, a predetermined image can be recorded or displayed by accessing the font ROM storing character patterns according to the character code.

(Problem to be solved by the invention) However, according to character generators, there are, for example, the old JIS, which was established in 1978 as a standard for character codes for kanji (JISC6226), and the new JIS, which was established in 1983. However, since the old JIS is currently mainly used,
When a character code based on the new JIS is received from a host computer, there is an inconvenience that a character pattern other than the predetermined characters is generated.

[Means for solving problems]

The present invention has been made in view of the above, and in order to prevent mismatching with the host computer as described above even if a character code based on the new JtS is received from the host computer, address conversion is performed according to the old and new JIS standards. The present invention provides a character generating device which accesses a font ROM by accessing a font ROM.

Hereinafter, a character generating device according to the present invention will be explained in detail.

〔Example〕

FIG. 1 shows an embodiment of the present invention, an image signal generating device 1 that inputs a character code from an external device such as a personal combinator and outputs an image signal (a network node may be configured by a LAN). and image signal generator 1
A recording section 2 which receives an image (& signal, print command, etc.) and prints it on a recording paper 5, and also supplies a clock signal, a line peer signal, a status signal, etc. to an image signal generator l, an image signal generator 1, a recorder. It has a power supply circuit 3 for supplying power to the section 2 and the like, and a display panel 4 for operating the printer.

FIG. 2 shows the image signal generating device 1, which receives a character code 1: from an external personal computer, for example, R323.
2C full view (interface part 11 which is accepted in old times, control part 12 which performs system control, character pattern ROM 31 which records character patterns and pixel patterns for kanji of old and new JIS), and character patterns and pixel patterns. An image handler 14 that performs predetermined processing on pixel patterns, and a bitmap memory 1 that records character patterns and pixel patterns processed by the image handler 14 in units of pages.
5, a memory controller 16 that controls the access timing to the bitmap memory 15, an interface section 17 that outputs image No. 13 to the recording section 2, and an output interface section 18 that outputs a signal to the display panel. have The control unit 12 includes a CPU 12a that controls various operations, a RAM 12b that temporarily stores data and calculation results in various operations, and a ROM 12 that stores various programs and an address conversion table (CROM) to be described later.
c, a parallel input/output circuit 12d that inputs operation key signals in parallel to the display section (outputs iM)], and a DMA controller 12c that controls access 1ffl in data transfer between the two has.

Figure 3 shows examples of characters in which level 1 and level 2 kanji are swapped in the new and old JIS standards for character codes for kanji mentioned above, where CG226 (1978) represents the old JIS and C6226 (1983) represents the new JIS. It represents. As is clear from this diagram, each kanji character is designated by a 2-byte character code consisting of a ward and a dot.

In the above configuration, the operation will be explained as follows. First, when the interface section 11 receives a character code and a control code from a personal computer, C
The PU 12a reads the control code and determines whether it is the new JIS or the old JIS. That is, system 1
111 code is ESC (SIB) 4・$ ($2・1)
-) B ($42), the new JIS is specified, and ESC (SI B) → $ ($24) + @
($40), it means that old JIS is specified. At the same time, the CPU 12a uses the added value obtained by adding the content of the character code and the base address of the CROM as the fourth address.
Access the CROM shown in figure (a) and use D0 to Dlt there.
Read the contents stored in the old and new table pointers as the new and old table pointers. Here, in the above-mentioned control code interpretation, when it is determined that the new JIS is specified, the added value of the new JIS base address is added to the table pointer read out. CI' in Figure 4 (b) as an address? Access OM. On the other hand, when the old JIS is specified, the CROM is accessed using the added value obtained by adding the old JIS base address to the table pointer described above as an address. The content read in this access is the font address, that is, the address of the character pattern generation ROM 13, and based on this address, the character pattern generation ROM 13
access. The character pattern generated by this access is processed by the image handler 14 (
For example, the image is enlarged, reduced, rotated, reversed, emphasized, etc.) and then stored in the bitmap memory 15. In this way, when an image for one page is formed in the bitmap memory 15, the interface unit 17
The image signal is outputted to the recording section 2 or a display (not shown) via the recording section 2 or a display (not shown). FIG. 4(c) is a flowchart showing the operations described above.

In the above embodiment, the CRO is stored in the ROM 12c of the control unit 12.
Although M is stored, the following operation can be used instead. That is, when the new and old JIS specifications are entered from the keyboard by key operation, an address conversion IQ table is created in the RAM 12b by the program in the ROM 12c, and the address conversion table in the RAM 12b is accessed based on the input character code and the HAS address mentioned above. It is also possible to apply the following operations, but the subsequent operations will overlap with those of the above-mentioned embodiment.

FIG. 4 shows the recording unit 2, 20 is a laser light source that emits a laser beam 22, 21 and 25 are polarizers, 23
2 is a modulator having an image signal input terminal 24, 26 is a rotating polygon mirror, 27 is an fθ lens, 28 is a photosensitive drum, 29 is a developing device, and 30 is a transfer device.

In the recording section 2 having the above configuration, when an image signal is input from the interface section 17 to the input terminal 24 of the modulator 230, a laser beam 2 is emitted from the laser light source 20.
2 is modulated according to the image signal. This laser beam 22 is scan-controlled by a rotating polygon mirror 26 and exposes a photosensitive drum 28 through an fθ lens 27. The photoreceptor drum 28 is charged before exposure, and by this exposure an electrostatic latent image corresponding to the image in the bitmap memory 15 is formed on the photoreceptor drum 28. This quietness? H? ! The image is developed with toner by the developer [129] and transferred onto the recording paper 5 by the transfer device 30. The image on the recording paper 5 is fixed by a fixing device (not shown), and recording of the image is completed.

〔Effect of the invention〕

As explained above, according to the character generator of the present invention, since the font ROM is accessed by performing address conversion according to the old and new JIS standards, character codes that are convex in the new JIS are received from the host computer. It is also possible to generate a predetermined character pattern, thereby preventing mismatching with the host computer.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention. FIG. 2 shows 1iTii1q1. in FIG. FIG. 3 is an explanatory diagram showing the new and old JIS character code table. FIG. 4 (A) and (1:J) are explanatory diagrams showing CROM. FIG. FIG. 5 is an explanatory diagram showing a laser recording section. Explanation of symbols 1...--Image signal generator 2--...
...-Recording section 11...--Interface section 12...-
control part

Claims (1)

[Scope of Claims] In a character generation device that generates character patterns corresponding to character codes from a font ROM and stores them in an image memory, a correspondence relationship between mutually related character patterns and the character code is defined as a relationship between the character patterns. a storage means for storing the correspondence defined by a plurality of types of standards according to the number of standards; and a control means for accessing a predetermined address of the font ROM based on the correspondence according to the type of the standard. A character generator characterized by: