JPH0497396A - Crt display system - Google Patents

Abstract

PURPOSE:To extend a character generator dynamically by providing a selecting circuit which selects one of three kinds of character generator and a display circuit which displays the selected character with the best pattern. CONSTITUTION:The CRT display system is equipped with the selecting circuit 5 which selects one character generator among three kinds of character generator which are a positive character generator 2 for generating a positive character, a negative character generator 3 for generating a negative character, and a RAM character generator 4 capable of generating either a stroke character or a dot character. Further, the system is provided with the display circuit 6 which displays the selected character generator with the best pattern corresponding to the purpose of use by a user. Consequently, the character generator can be extended according to the purpose of use by the user.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a CRT display system, and in particular to a CRT display system that uses a plurality of character generators to select a display pattern.
Regarding RT display method.

[Conventional technology]

In conventional CRT display devices, when displaying characters, a character generator ROM for positive display is usually used.
The content of ``G'' was displayed as is, and when a negative display was made, it was displayed by reversing the on/off status of ``Do'' and ``G''.

[Problem to be solved by the invention]

The above-described conventional CRT display method reads and displays the contents of one type of character generator ROM, and therefore has a problem in that when the display is reversed, the thin lines are crushed, making it difficult to see.

In addition, since a character generator ROM is used, only the character generator written in the ROM can be displayed, and like a stroke character generator, the character generator cannot be dynamically expanded according to the user's purpose. The problem was that it couldn't be done.

The purpose of the present invention is to prevent thin lines from being crushed and difficult to see even when the display is reversed, and to dynamically expand the character generator according to the user's purpose, like a stroke character generator. The object of the present invention is to provide a CRT display method that can display images.

[Means to solve the problem]

The CRT display system of the present invention includes (A) a positive character generator that generates positive characters, (B) a negative character generator that generates negative characters, and (C) a RAM character that can generate either stroke characters or dot characters. a cloud generator; (D) a selection circuit that selects one of the three character generators; (E) a selection circuit that selects one of the character generators from the three types of character generators; The display circuit is equipped with a display circuit that performs display in an optimal pattern.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The CRT display method shown in FIG.
Generator 2, negative character generator 3 that generates negative characters, RA that can generate both stroke characters and dot characters
M character generator 4.Character generator selection circuit 5 for selecting one character generator from three types of character generators
, a CR7 display circuit 6 that displays the character generator selected by the selection circuit in an optimal pattern according to the purpose of use by the user, a code generation circuit 7 that specifies the address of the character generator, and a CRT unit 10. has been done.

Next, the operation will be explained.

In FIG. 1, a data processing device 1 supplies data corresponding to a user's purpose to a RAM character generator 4 via an address bus 104. Write using data bus 103. The content to be written may be a stroke character or a dot character.

Then, by operating the character generator selection circuit 5 using the control signal 11, the positive character generator 2. Negative character generator 3. One of the RAM character generators 4 is selected using control signals 12-14.

On the other hand, when the code generation circuit 7 is controlled by the control signal 15, the code generation circuit 7 generates the positive character generator 2. Negative character generator 3
．． The characters stored in the selected character generator of the RAM character generators 4 are
Addresses are specified using the address bus 102, and data is sent to the display circuit 6 via the data bus 101. And C.R.
7 is displayed on the CRT unit 10 by the display circuit 6.

〔Effect of the invention〕

As explained above, the present invention has three types of characters.
By having a generator and selecting it, thin lines will not be crushed and difficult to see even when the display is reversed, and like a stroke character generator, it can be dynamically adjusted according to the user's purpose. This has the effect that the character generator can be expanded.

[Brief explanation of the drawing]

FIG. 1 is a diagram of one embodiment of the present invention. 1...Data processing device, 2...Positive character fist generator, 3...Negative character generator, 4...RAM
Character generator, 5...Character generator selection circuit, 6...Display circuit, 7
...Code generation circuit, 10...CRT
Units, 11-16... Control signal, 101.
...Data bus, 102...Address bus, 103...Data bus, 104...
・Address bus. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] (A) Positive character generator that generates positive characters, (B) Negative character generator that generates negative characters, (C) RAM character generator that can generate both stroke characters and dot characters. (D) a selection circuit for selecting one of the three character generators; (E) for the character generator selected by the selection circuit, depending on the user's purpose of use; A CRT display system characterized by comprising: a display circuit that displays in an optimal pattern.