JPH04165440A - Device for operation mode changing by bank switching - Google Patents

Abstract

PURPOSE:To make a change between different mode speedily while storing the current state by storing the environment of the current operation mode in a storage area and switching banks to target operation modes. CONSTITUTION:This device has a central processor which has a bank switching function, program data areas 1 and 2 for plural banks corresponding to plural modes respectively, the common data area 3 wherein current operation environment of each register of the central processor is stored prior to the switching between the operation modes, and a common program area 4 where a program for switching the operation modes is assigned. Namely, data required to store environment before the operation mode change is assigned to the common data area 3 and the program which changes the operation modes is assigned to the common program area 4. Consequently, the operation modes are changed and a speedy return from each operation mode to the previous operation mode is made.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a word processor with multiple operating modes;
The present invention relates to an information processing apparatus such as a personal computer, and more particularly, to an information processing apparatus whose operating mode is changed by switching banks.

BACKGROUND OF THE INVENTION Examples of changes in the operation mode of conventional information processing apparatuses include the following.

(1) Change the operating mode by ending the current operating mode and starting a new operating mode.

(2) Change the operating mode by setting the environment for another operating mode on top of the main operating mode.

In this method, when returning to the main operating mode, the other operating mode is terminated and the main operating mode is returned to its initial state.

Problems to be Solved by the Invention However, in the conventional operation mode change, in (1) of the previous section, it takes time to end the current operation mode and start a new operation mode, Therefore, no matter which operating mode is restarted, it is not possible to return to the previous state.

However, in (2) of the previous section, it takes time to set up the environment for another operation mode on top of the current operation mode, and it takes time to complete the termination process when returning to the main operation mode. There is a problem in that when returning to the operating mode of the main operating mode, it is not possible to return to the previous state of the operating mode other than the main operating mode.

SUMMARY OF THE INVENTION An object of the present invention is to solve these conventional problems and provide an operation mode changing device by bank switching that can quickly change between different modes while preserving the current state.

Means for Solving the Problems In order to achieve the above object, an operating mode changing device by bank switching according to the present invention includes a central processing unit having a bank switching function, and a plurality of banks corresponding to each of a plurality of modes. A program data area, a common delta area that stores the current operating environment in each register of the central processing unit prior to switching between multiple operating modes, and a common program area that allocates programs for switching between multiple operating modes. The configuration has the following.

According to the above configuration, the present invention stores the environment of the current operation mode in the conservator 9A when switching the operation mode, and after switching the bank to the desired operation mode, saves the environment of the current operation mode in the conservator 9a. This can be achieved by restoring the environment from the storage area.

Embodiment Below, based on the drawings, an operating mode changing device by bank switching according to an embodiment of the present invention has WP (word processor operating system, hereinafter referred to as WP) as a first mode and a second mode. D.O.
3 (Disk Operating System, hereinafter DO)
It is written as 8. ), it has two operating modes, ``screen switching''
A device that changes the operating mode of WP and DO8 using the key will be explained.

FIG. 1 is a memory map of an operation mode changing device by bank switching according to an embodiment of the present invention. 1dWP program and WP in WP program/data area 1
data has been allocated. Program for DO5
A DO8 program and DO8 data are allocated to data area 2. Bank switching is possible between the WP program/data area 1 and the DO8 program/data area 2 (switching of memory allocation by outputting to the I10 boat). In the common data area 3 for wp and pos, data necessary for preserving the environment before the change is also allocated in order to change the operation mode. W.P.

A program for changing the operating mode is assigned to the common program area 4 of DO3.

It has such a memory map and is controlled by a central processing unit (hereinafter abbreviated as CPU, not shown) having a bank switching function.

The operation of the operation mode changing device by bank switching configured as described above will be described below with reference to the flowchart of FIG. 2. This routine
, DO3 is assigned to the common program area 4, and when a key manual routine of WP or Dos makes a key capture request, it operates on area 4.

Step 5 is a step for determining whether the key code is present or not, and it is checked whether the key code is contained in the key buffer. If it is, it is determined that there is a key, and if not, it is determined that there is no key. If there is no key, in step 6, the key manual routine of the WP or DO8 that made the key capture request is notified of the absence of the key, and the process ends. If there is a key, go to step 7. In step 7, the key code is taken out from the keypad sofa and it is determined whether it is the "1 screen change" key. If it is not the "screen change" key, in step 8 the key code is returned to the WP or DOS key manual routine that requested the key capture. In the case of the "screen change" key, processing for changing the operation mode is performed in steps 9, 10 and 11.

In step 9, the current operating mode environment, i.e., W
When there is a request to retrieve the key from P, the wp environment,
When a key import request is received from DOS, the DOS environment is saved in the common data area 3. At this time, the environment to be saved refers to each register of the CPU. Other environments are stored in WP area 1 or DOS area 2, so there is no need to save them.

In step 10, bank switching is performed. If the current operation mode is WP, from bank Iwp program/data area 1 to DO8 program/data area 2,
If the current operating mode is DOS, the DO8 program/data area 2 is switched to the WP program/data area 1. In step 11, a return process to the previous environment is performed. When switching to DOS, the previous DOS
When switching to WP, the previous W
The environment is restored to P by restoring the registers from the common data area 3.

The above explanation was based on switching between two modes, but
Even in the case of three or more modes, it is sufficient to prepare a program/data area for the added mode.

Effects of the Invention As described above, since the present invention switches the operating mode by switching the bank of the program/data area, the only other processing required is saving and restoring registers, and the operating mode can be changed quickly. In addition, it is an object of the present invention to provide an operation mode changing device using excellent bank switching, which can quickly return from each operation mode to the previously operated mode.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a memory map of an operation mode changing device by bank switching according to an embodiment of the present invention, and FIG. 2 is a flowchart of a program for changing the operation mode. 1...Program data area for WP (word processor operating system), 2...
...Program data area for DOS (disk operating system), 3...WP,
DOS common data area, 4...WP. DoS common program area. Name of agent: Patent attorney Akira Okaji and two others Figure 1/Z

Claims (1)

[Scope of Claims] A central processing unit having a bank switching function, a plurality of program/data areas of a plurality of banks corresponding to each of a plurality of modes, and a central processing unit having a bank switching function, a program/data area of a plurality of banks corresponding to each of a plurality of modes, and a central processing unit having a bank switching function. It has a common data area that stores the current operating environment in the register, and a common program area that allocates programs for switching between multiple operating modes.When switching from the first mode to the second mode, Based on the program for switching the operating mode of the common program area, the central processing unit first stores the current first mode operating environment in each register in the common data area, and then switches the plurality of programs.・Bank switching is performed from the area of the data area that accommodates the program and data of the first mode to the area that accommodates the program and data of the second mode, and An operating mode changing device by bank switching configured to take out an operating environment and restore it to each register of a central processing unit.