JPS6277641A - Picture switching control system for local system - Google Patents

Abstract

PURPOSE:To switch pictures only by switching a picture buffer connected to a physical display to the other without data saving nor restoration in operation mode switching by providing picture buffers stored with respective data on a system image and a terminal emulator picture at logical level respectively. CONSTITUTION:The contents of a terminal emulator picture buffer 112 are outputted and displayed on a display device 116 in terminal emulator mode. When a system mode is entered by operating an interruption key 119, the picture buffers are switched by a system program. Consequently, the contents of the system picture buffer 114 are displayed on the display device 116. Further, when the terminal emulator mode is entered by operating a continuation key 120, the picture buffer in use is switched from the system picture buffer 114 to the original terminal emulator picture buffer 112.

Description

[Detailed Description of the Invention] [Summary] When the local system has a terminal emulator mode in which it operates as a terminal of the host system and a system mode in which it operates as a local system, it is possible to To enable an instruction to display a mode screen using a switching key.

[Industrial application field]

The present invention relates to a local system screen control method in a data processing system in which a plurality of host seven local systems are combined.

[Conventional technology]

FIG. 3 shows an example of a data processing system to which the present invention is applied.

In the figure, 30 is a host system, 31.32 is a local system, 301.311.321 is a processor, 302.312.322 is a display, 303
．． 313.323 is a file device, 304.314.
324 indicates a printer.

Each local system 31.32 has a host system 30
As a terminal, it can perform processing using programs and data in the host system 30, and it can also be separated from the host system 30 and perform processing using programs and data in the local system. Each local system can perform the former process using data. In each local system, the operating state in which the former process is performed is called terminal emulator mode, whereas the operating state in which the latter process is performed is called system mode.

These terminal emulator modes and system modes are 1. Normally 9. Specific keys (e.g. break and continue keys)
It can be switched using .

The screen on the display can also be switched at the same time.

Screen switching is controlled by the system program of the local system, but it is necessary to save and restore screen data in the mode before switching.

FIG. 4 shows an example of conventional screen switching processing associated with mode switching.

In the figure, 41 represents a display screen of the local system, and 42 represents a memory save area.

(2) is a state in which IPL is executed by turning on the system power, and the system mode is initially displayed, and the system screen is displayed on the display.

- Terminal emulator mode is activated to transfer some information from the host system to the local system, for example. Therefore, the data on the system screen is saved to the save area, and then the terminal emulator screen transferred from the host system is displayed on the display.

■The interrupt key is pressed and a switch to system mode is instructed. Therefore, the data on the terminal emulator screen is saved to the save area, and instead of 9, the data on the system screen is recovered and displayed on the display.

In this system mode, processing such as detailed format specification when outputting information transferred from the host system to a printer is executed.

■When processing on the system screen is completed, the continue key is pressed to instruct switching to terminal emulator mode. Here, the data on the system screen is saved to the save area, and instead of 9, the data on the terminal emulator screen saved in ■ is restored, and the terminal emulator screen is displayed on the display.

In this way, when switching between the system screen and the terminal emulator screen, one screen data is saved and restored.

In this process, when the system program of the local system detects that the interrupt key or continue key has been operated, it identifies the operating mode at that time, specifies the address of the corresponding save area, and executes the READ, WRIT
This is done by issuing the E command.

[Problem that the invention seeks to solve]

In conventional local systems, nine screen data are saved and restored when switching operation modes, so the system program must manage the information necessary for this, especially knowing the status in terminal emulator mode. Because it is necessary.

There is a problem in that the burden becomes large, and if the screen data to be saved is image data, a large save area is required.

[Means for solving problems]

The present invention provides separate screen buffers that hold each data of the system screen and terminal emulator screen at a logical level, and does not perform save or restore processing when switching operation modes, but simply connects the screen to the physical display. It simply switches the buffer from one side to the other.

FIG. 1 shows the basic configuration of the present invention.

In the figure, 10 is a host system, 11 is a local system, 111 is a terminal emulator section, 112 is a terminal emulator screen buffer, 113 is a business program processing section, and 114 is a system screen buffer.

115 is a selector, 116 is a display device, 117
118 is a mode flag, 119 is an interrupt key, and 120 is a continuation key.

In the local system 11, the terminal emulator section 1
11 performs terminal function control for transmitting and receiving data to and from the host system 10.

Terminal emulator screen buffer 112 holds, at a logical level, screen data created or transferred from host system 10 while local system 11 is operating in terminal emulator mode.

The business program processing unit 113 is the local system 11
when running in system mode.

Executes the processing of the business program (or application) instructed by the user.

The system screen buffer 114 is the local system 11
It maintains, at a logical level, the data of screens created when the is running in system mode.

In accordance with instructions from the system control unit 117, the selector 115 causes the display device 116 to select the terminal emulator screen buffer 11 when in the terminal emulator mode.
2 is connected, and in system mode, a system screen buffer 114 is connected.

The display device 116 converts the logical screen data of one of the connected screen buffers 112 and 114 into physical image level screen data and displays it on the CRT.

The system control unit 117 executes processing of the system program of the local system 11. Here, IPL
When there is a mode instruction from the host system 10, when an operation of the interrupt key 119 or the continue key 120 is detected, the corresponding operation mode display is set in the mode flag 118, and at the same time control is performed to switch the selector 115. conduct.

[Effect]

According to the configuration of the present invention shown in FIG. 1, the terminal emulator screen buffer 112 and the system screen buffer 114 are dedicated to the terminal emulator mode and the system mode, respectively, and are therefore independent of switching between operating modes. The screen data is retained, so there is no need to save or restore it.

Therefore, the system control unit 117 only needs to switch the screen buffers 112 and 114 using the selector 115 according to the operation mode, and the management burden is significantly reduced.

[Embodiment] FIG. 2 shows the operating procedure of one embodiment of the present invention based on the configuration of FIG. 1.

In the figure, 112 is a terminal emulator screen buffer;
114 represents a system screen buffer, and arrows represent screen switching on the display device 116.

3 is a state in the terminal emulator mode, and the contents of the terminal emulator screen buffer 112 are outputted to the display device 116 and displayed in one.

■The interrupt key 119 is operated to enter the system mode.

Screen buffer switching is performed by the system program, and as a result, the contents of the system screen buffer 114 are output to the display device 116 and displayed once.

■Continue key 120 is operated to enter terminal emulator mode. The system program switches the screen buffer used from the system screen buffer 114 back to the terminal emulator screen buffer 112. The display device 116 immediately displays the terminal emulator screen before the switching at ■.

〔Effect of the invention〕

According to the present invention, the system program of the local system only needs to switch screen buffers when switching operation modes, and control can be significantly simplified. In addition, since the logical screen held in the screen buffer has a fixed format, the size of the two-screen buffer can be fixed, for example, 10 Kbytes, regardless of the mode.Compared to the conventional method of providing a save area, The amount of memory required can be reduced.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the basic configuration of the present invention, Fig. 2 is a diagram showing the operating procedure of one embodiment of the present invention, and Fig. 3 is a diagram showing the configuration of a general data processing system to which the present invention is applied. The figure shown in FIG. 4 is a diagram showing an example of the operation procedure of screen switching processing according to the conventional method. In Figure 1. 10: Host system 11: Local system 111: Terminal emulator unit 112: Terminal emulator screen buffer 114 System screen buffer 115: Selector 116: Display device 117: System control unit 119: Interrupt key 120: Continue key Patent applicant: User Tsuku Electronics Industry Co., Ltd. Company representative patent attorney Fumihiro Hase (2 others) book, to the 4 rational spirits of August. $ 1 圀、NE5月日月r）l Actually 庨已INJのすOGγ手I 連 2 fig. 4艮艮≦稍 ゛nu 1゛Elephant and genius rtl JL system th4 Chile 3rd C Li

Claims (1)

[Claims] Consisting of a host system and a local system,
In a data processing system that has two operating modes: a terminal emulator mode in which the local system operates as a terminal of the host system and a system mode in which local system processing is performed, the local system (11) outputs output while operating in terminal emulator mode. A terminal emulator screen buffer (112) that holds logical screen data and a system screen buffer (114) that holds logical screen data output during operation in system mode are provided, and when the switching of the operation mode is instructed, A screen switching control method for a local system, characterized in that one of a terminal emulator screen buffer (112) and a system screen buffer (114) corresponding to an operation mode to be switched next is selected and its contents are output and displayed.