JPS5917585A - Reading system for character generator - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a system for successively displaying a character/2° generator in a character display device.゛Displaying a character pattern in the prior art raster φ scan method involves giving a character code and a raster address (scan number) to a character generator, where the raster address is a raster address.

Each time the counter counts sequentially, that.

The character pattern corresponding to the address is read out.

It is done by this. In other words, when displaying a character pattern in a 1° line on the display screen, the display position of the 1 character pattern [is the position corresponding to the 2° star address of the character generator] and reads the p character pattern. displayed by. In this way, a 2-star address counter has multiple outputs.

address and a rast of the character pattern that is the input for reading the character generator.

There was a one-to-one correspondence between tar and addresses.

The prior art has the configuration described above.

Example of displaying by changing the number of rasters in one line.

For example, when increasing the line spacing to make the characters easier to read, .

Display of lines, underlines, etc. and character patterns.

To arrange the positional relationship in a well-balanced manner,
It becomes necessary to rewrite and shift the character patterns arranged in the raster address order in the generator every time the number of rask lines in one line is changed.

Also, the number of displayed lines on the screen can be changed dynamically.

For devices that display multiple rasters, cut off the number of rasters per line.

It is desirable to display the text with variable line spacing.

When realizing such a device, it is possible to increase the number of display lines.

Rewrite the character generator according to the change.

or require special hardware.

Become.

OBJECT OF THE INVENTION The object of the present invention is to eliminate the above-mentioned 15 conventional problems.

To read a character generator capable of displaying a character pattern at an arbitrary position on a rask constituting one line without rewriting the character pattern of the character generator according to the number of stars.

The purpose is to provide a method for extracting.　　　　.

The features of this invention are raster address,
By separating the correspondence between the counter address and the 5 addresses of the character patterns arranged in the character generator and setting a raster address converter between them, it is not directly influenced by the raster address. charactor·.

The purpose is to read and display the character pattern of the generator. lf1 Embodiments of the Invention Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a display 1 for explaining a reading method of a character generator which is an embodiment of the present invention.

FIG. 2 is a block diagram showing part of the device. CRI’・Co.

The controller 21 synchronizes with the CRT 9 and refreshes the memory address signal 9. Lascou address signal 3
It is a controller that generates.

CRT controller 1 was created by Freno.

2.Memory address signal 9 is refreshed.

Memory 6 address and name, refresh tool/me.

Character code signal 7 appears as the output of memory 6.

Ru. Same (The raster address signal 3 obtained from the CRT controller 1 is the output of the raster designation register 2, which indicates the number of 2 stars and 5 stars in one row.

10 along with 40 raster address converters.

number. CG obtained by raster address converter 4
- Raster address signal 5 is a character.

The character code is used as a 10 raster address to read out the star generator 80 character pattern.

Character generator 80 is input along with code signal 7.

It becomes a force signal.

FIG. 2 is a diagram showing the configuration of the raster address converter 4, which is a feature of the present invention. 15 In this embodiment, the raster address converter 4 is connected to a ROM (read
(only memory). Output 10 of 2/star specification register 2 that indicates the number of 2 stars in one line
-1 and 10-0 are connected to the most significant bit of the ROM chip selector 20 of the address converter 4). In this embodiment, there are two types of rasters in one row.

If the change is made, the contents of 2 star designation register 2 will be changed to turtle O.
When Il is indicated, raster address converter 4
The conversion table '・0 written in is selected and %1
When it indicates 1, conversion table 1 is selected.

The raster address signal 3 is directly input to the ROM addresses A+ and AO of the raster address converter 4 and R
The CG@') star address signal 5 selected by the raster designation register 2 is obtained as the output of the OM.

FIG. 3 is a diagram for explaining the present invention in detail.

be. Figure 5 (α) shows the character generator 8° (
(See Figure 1).

9 out of 11 rasters are used as 15 character patterns. Figure 3 (h) is one line.

The display screen is composed of 14 rasters, and FIG. 3(C) shows an image composed of 20 rasters per line.

It is a surface.

Now, the raster 9 designation register n0 in FIG. . If the color indicates l, it means that the number of rasters in one row is 14, and the contents of conversion table 0 are.

selected. An actual raster number 1, such as the raster address signal 5Fi, ψ in FIG. 3, which indicates a raster address for one row, is converted to a CG raster 5 address. In other words, when 2-star address signal 3 indicates raster address vAo#J2N, CG/raster/
Address signal 5 is converted to raster address ol,
%5#-, Ki B〃 is Ki 1# +++.

Corresponding to %9N, %(:I, %OI is converted to KiteA〃10. In this way, the character pattern stored in the character generator 8 can be displayed at any raster position. become.

FIG. 3(C) shows the case when %1N is specified in the raster designation register 2, and the conversion operation is performed using the conversion tape 151 in the same manner as described above.

With this kind of configuration, it is a raster specified register.

The number of rasters in one row can be adjusted just by setting Star 2.

and display the character pattern at any position.

I can do that. 2. In the embodiment described above, the raster address converter 4 is a ROM.
It is constructed by RΔ(2n.

Dumb fist access memory) may also be used. However, in the case of
Instead of selecting a conversion triple using a raster specification register, a method of directly rewriting the contents of Lα may be used. Also, although the number of raster conversion tables is two, it is not limited to two.

Effects of the Invention Since the structure is as described above, the following effects can be obtained with the present invention.

Since the address of the character generator is referenced by the raster address converter independently of the two-star address counter, the character pattern of the character generator can be displayed on any raster header.

It is necessary to have multiple conversion tables stored in the address converter according to the number of rasters in one row.

You can freely change the raster composition of one row.

・Especially with devices that change the number of lines displayed on one screen.
・is an effective method.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the Yomita method of a character generator showing an embodiment of the present invention, Fig. 2 is a detailed diagram of the raster address converter, and Fig. 5 shows the operation of the raster address converter. FIG. DESCRIPTION OF SYMBOLS 1... CRT controller, 2... Raster specification register, 4... Raster address converter, 10
6...Refresh memory, 8...Character generator. 1 + 2 figure

Claims (1)

[Claims] 1. Character 5 code output from the refresh memory and raster e-address output from the raster address generator. Read the character pattern stored in the generator. The raster address output from the raster address generator is arbitrary. When taking a number raster, the raster address. The part other than the part corresponding to the character pattern of the text. The character pattern of the character generator. An address that indicates a part other than the part it represents. Convert this to the character generator. A key characterized by being a raster address. Yarakuta Generator readout method.