JPS5885483A - Display controller - 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 The present invention particularly relates to a display control device with improved save and restore control of screen information.

Conventional saving and restoring control of screen information including kanji patterns will be explained with reference to FIG. Generally, while a job is being executed, a new job with a higher priority occurs, and in order to switch to execution of the new job, the contents of the CRT screen of the job that was being executed so far are saved to an external storage device and given priority. After completing a high-level job, it is necessary to return to the screen contents before saving. As shown in FIG. 1, a CRT display device that can display kanji characters in addition to alphanumeric characters displays input alphanumeric codes or kanji codes in a patterning section 1 using RO)J (read-only memory). By reading out the contents stored in the alphanumeric pattern memory 2 and the kanji pattern memory 3, which consist of alphanumeric characters, etc., the pattern data is set in the pixel register 4. The CRT controller 5 reads out the contents set in the pixel register 4 in synchronization with the scanning of the scanning line, and displays it on the display screen of the CRT display unit 6. Note that the pixel register 4 stores alphanumeric patterns and kanji patterns without distinction. That is, the pattern image itself displayed on the CRT display section 6 was stored in the register 4.

Then, exit the content displayed on the cRT display section 6]
1, the contents stored in the pixel register 4 are taken out to the main storage device 7 of the computer without changing their order, and saved to an external storage device 8 such as a magnetic disk device via the main storage device 7. The screen information that should be displayed was now stored. In addition, when restoring the saved information, it is restored by following a route opposite to the above-mentioned route.

However, according to Hiko, in this advanced control method, since the contents stored in the pixel register 4 are the pattern images themselves displayed on the CRT display section 6, it is necessary to transfer and store screen information during evacuation or return control. The disadvantage is that the storage area required for each process becomes large and the processing time is too long.

This invention was made in view of the above circumstances,
When saving or restoring screen information, instead of handling it as a pattern image, it handles down to 1 code information, reducing the screen information storage area and the processing time for saving or restoring screen information. The purpose is to provide a control device.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram of an embodiment of the present invention. In the figure, 11 is a memory, and this memory 11 includes a code register nzza in which an alphanumeric or kanji code is stored, and whether the code information * stored in each register of the code register group 11th is alphanumeric or kanji. It is composed of an attribute register group 11b in which information (attribute information) that distinguishes between the two is stored. 12 is a pixel register 3-star which stores pattern information for one section (one character area on the screen) or, in terms of efficiency, the number of sections for one line on the screen. . 13 is an alphanumeric pattern memory in which alphanumeric patterns corresponding to each alphanumeric code are stored. A kanji pattern memory 14 stores kanji patterns corresponding to each kanji code. 1
5 is a CRT controller that sequentially reads a pair of character codes and attribute information stored in the memo 911, determines whether the code is an alphanumeric code or a kanji code according to this attribute information, and determines whether the code is an alphanumeric code. In this case, the pattern corresponding to the alphanumeric code is read from the alphanumeric pattern memory 13, its contents are set in the pixel register 12 in synchronization with the scanning line, and a predetermined pattern on the display screen of the CRT display unit 16 is read out. Control the display in the position. Similarly,
If it is a kanji code, the pattern corresponding to the kanji code is read from the kanji pattern memory 14, its contents are set in the pixel register 12, and the pattern is displayed at a predetermined position on the display screen of the C'RT4- display section 16. Control as follows.

Further, the memory 11 is a memory corresponding to the display screen of the CRT display section J6, and as shown in FIG. is 1
It consists of an attribute register group 11b consisting of byte attribute registers. If the food register is an alphanumeric code, it is stored in the first byte, and if it is a kanji code, it is stored in the second byte.

Furthermore, it is possible to distinguish whether the contents of the code registers input in pairs are alphanumeric codes or Kanji codes by arbitrary bits on the attribute registers. In other words, this pair of code register and attribute register allows one section (one character area) on the screen.
is now displayed, and memory 1 is CR.
It is composed of a number of pairs of code registers and attribute registers corresponding to the total number of display screens in the T display section 16. Further, in FIG. 2, 17 is a main storage device, and the screen code information stored in the memory 11 is transferred to the external storage device 1 through this main storage device 17.
I'm looking forward to being evacuated at 8.

Next, the operation of the above embodiment 0 will be explained. First, data output from a control section (not shown) is written into the memory 11. At this time, whether the character code is an alphanumeric code or a kanji code (this can be distinguished by a command or by a subcommand on the data) is determined by the CRTfi display section 1.
6 is omitted in the attribute register corresponding to the corresponding section of the display screen. On the other hand, the character code is written into the code register paired with the attribute register as shown in FIG. When displaying one section on the screen in synchronization with tansashi lines, the CRT controller 15 reads the code from the code register and the attribute information that distinguishes whether it is alphanumeric or kanji from the attribute register, and displays the code. According to the information, an alphanumeric pattern or a kanji pattern corresponding to the code is read from the alphanumeric pattern memory 13 or kanji pattern memory 14, and its contents are stored in the pixel register 1.
Set it to 2 and display it on the screen. Therefore, the pixel register 12 has an extremely small capacity capable of storing pattern information for displaying one section of the screen. In this case, as is clear from the above description, the basic information for the entire screen is stored in the memory 11 instead of in the pixel register 12.

When saving and restoring screen information, memory 1
1 is stored in the external storage device 18 via the main storage device 17. Therefore, the amount of information to be saved is small compared to the conventional method. Furthermore, when saving and restoring screen information, there is no need to distinguish between which sections on the screen display are alphanumeric characters and which sections are kanji. 11b
All you have to do is read and write the memory contents of 7-.

Therefore, such a display control device has the following effects.

[11 Since the amount of information required to save the screen is small, it is possible to reduce the storage area of the screen save area in the main storage device 17 and the external storage device 18.

(2) Screen evacuation and return control is possible without distinguishing between "alphanumeric characters" and "kanji" even if the screen is a mixture of kanji.
This can be dealt with by reading the entire screen that is stored in the memory 11.

(3) The capacity of the pixel registration 12 can be reduced compared to the conventional one.

As described above, according to the present invention, when saving or returning screen information, it is handled as code information rather than as a pattern image, and the screen information storage area is reduced and the screen information is saved or restored. 8- It is possible to provide a display control device that can shorten processing time.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a conventional example, FIG. 2 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 3 is a diagram for explaining the configuration of a memory of the same embodiment. 11...Memory, 11a...Code register group, J
ob...attribute register group, 12...pixel register,
13... Alphanumeric pattern memory, 14... Kanji pattern memory, 15... CRT controller, 16...
- CRT display unit, 17...main storage device, 18...external storage device.

Claims (1)

[Claims] A display unit and a memory in which a character code and attribute information indicating whether the character code is an alphanumeric code or a kanji code are stored in pairs corresponding to each section of the display screen of the display unit. , an alphanumeric pattern memory in which alphanumeric patterns are stored, a kanji pattern memory in which kanji patterns are stored, and a pair of character codes and attribute information stored in the memories are sequentially read, and the attributes of the character code are read out. a controller that reads pattern information corresponding to the character code from the alphanumeric pattern memory or kanji pattern memory in response to screen scanning based on the information; and a pixel in which the read pattern information is stored in response to screen scanning. A display control device characterized in that a register and a main storage device and an external storage device in which the contents of the memory are stored are coaxial.