JPH01214955A - System for controlling crt of plural oss - Google Patents

Abstract

PURPOSE:To control plural OSs (Operating Systems) having different architecture by means of one and the same hardware by trapping instructions from each guest OS to a CRT at a BIOS (Basic Indexed Operating System) and IN/OUT instruction level. CONSTITUTION:In an information processing system where plural OSs are simultaneously operated, screen information tables 9a-9c which manage the screens of guest OSs 4a-4c, means 6a-6c which trap input/output instructions to a CRT 10 from the guest OSs 4a-4c at a BIOS and IN/OUT instruction levels, and a means 8 which controls the CRT 10 in accordance with a trapped instruction and the screen information tables 9a-9c are provided. Then, by switching the screens of the guest OSs 4a-4c at every OS by depressing a screen switching key, interruption is supriously generated at the guest OSs 4a-4c. Therefore, even plural guest OSs having different architecture can be controlled by means of the same hardware.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to CRT (Cathode Ray Tube).
), especially when using multiple OSs (Operator).
ing system).

[Conventional technology]

Conventionally, this type of CRT control method is r BIOS (Bas
icIndexed Operating System
m) is trapped at the instruction level and command processing is performed.

This makes it possible to control a plurality of guest OSs with the same architecture.

[Problem that the invention attempts to solve]

The conventional CRT control method described above is a method that controls multiple guest OSs of the same architecture in order to trap commands sent to BIO3 and process them, so it is impossible to control OSs that do not pass through the BIOSi. (This is not possible, and the same architecture is required.) It has the disadvantage that it cannot be controlled without an OS.

[Means to solve the problem]

Screen information table that manages the OS screen and the above-mentioned gas)
Means for trapping input/output commands from the OS to the CRT at the BIOS level and the IN/OUT command level.

means for controlling the CRT''f based on the trapped command and the screen information table; and means for switching screens for each OS by pressing a single screen switching key; The present invention is characterized in that it has means for generating a pseudo interrupt.

〔Example〕

Next, one embodiment of the present invention will be explained with reference to the drawings.

First, in order to facilitate comparison with the present invention, a conventional CRT
The control software configuration will be explained using an example shown in FIG. In this figure, an application program (AP) l is connected to a CRT (CathodeRay T
issue a command to the BIOS2 of the ube).

The CRT BIOS 2 analyzes the command issued from the application program 1 and issues an IN/OUT command to the CRT hardware 3 as a command. Also, from application program 1, CRT BI
There are cases where an I N/OUT command is issued directly to the CRT hardware 3 without going through the OSZ.

The CRT hardware 3 uses interrupts to notify the CRT timing. The interrupt is notified from the CRT hardware 3 to the CRT's BIOS 2 or the application program 1. The above control is 1
This is usually done for CRTs that have a display function.

FIG. 1 is a system configuration diagram of an embodiment according to the present invention. In this figure, when the guest OS 4a issues a BIOS level command from the application program 5a, it transfers control to the IN/OUT command level trap mechanism 7 after analyzing the BIOS command.

Also, the I
The application program 5a issuing an instruction for the N/OUT instruction level traps the IN/OUT instruction directly by the IN/OUT instruction level trap mechanism 7. From the IN/OUT instruction trap mechanism 7,
The trapped command is passed to the CRT control unit 8.

The CRT control unit 8 performs control such as issuing commands to the CRT hardware IO based on the commands trapped by the IN/OUT command trapping mechanism 7 and the contents of the OS screen information table 9a. Furthermore.

The CRT control unit 8 notifies the application program 5a of CRT timing.

A pseudo interrupt is generated to the application program 5a via the IN/OUT instruction level trap mechanism 7't. By performing such control, a virtual CRT display environment can be obtained.

Note that although the above explanation takes the case of control by OS 4a as an example, the same applies to the dust particles 084b and 4e.

FIG. 2 shows an example of screen switching in the above embodiment.

In the figure, the only physical screen (screen visible to the human eye) of the CRT is the screen 11a of OS 4a. In this state, screen 11b of Guess) OS4b
The screen 11c of OS 4c is not displayed as a physical screen. Guess) OS 4
b screen 11b and guess) OS 4 e screen lie
To change the screen to display the key date device (1
2a, 12b, 12c) by pressing the screen switching key (Guess) from screen 11a of OS 4a)
This can be done by sequentially switching to the OS 4b screen 11b. Such screen switching can be performed by the CRT control section 8 shown in FIG.

〔Effect of the invention〕

As is clear from the above description, one aspect of the present invention is as follows.

Each game) Instructions from the OS to the CRT'ii BIO
By trapping at S level and IN/OUT instruction level.

This has the advantage that multiple OSs with different architectures can be controlled by the same hardware.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a system configuration of an embodiment according to the present invention, Fig. 2 is a diagram showing an example of screen switching in the embodiment of Fig. 1, and Fig. 3 is an example of a software configuration in conventional CRT control. FIG. In the figure, l is an application program. 2 is CRT C) BIOS, 3 is CRT hardware, 4a. 4b, 4c are guest OS + 5a + 5b + 5c are application programs + 6a*6b, 5C is BIOS instruction level 2 horizontal 1 push mechanism, 8 is CRT control unit r 9a l 9b,
9c is a guest OS screen information table, 10 is CRT hardware, and 12a, 12b, and 12c are key card devices. Figure 1

Claims (1)

[Claims] 1. In an information processing system where multiple OSs operate simultaneously,
a screen information table for managing the screen of the guest OS; means for trapping input/output commands from the guest OS to the CRT at the BIOS level and the IN/OUT command level; A system for operating multiple OSs, comprising means for controlling a CRT, means for switching screens for each of the guest OSs by pressing a screen switching key, and means for generating a pseudo interrupt for the guest OSs. CRT control method.