JPS61221921A - Rising system for operating system - Google Patents

Abstract

PURPOSE:To enable a personal computer operator to select an operating system OS which is actuated by a personal computer with no complicated operation, by using a system file storing plural systems OS to attain the rise of a personal computer system. CONSTITUTION:A system file FD14 stores plural operating systems OS, and a slide switch 1 is set to send the selection signal to a CPU circuit 3 of a personal computer for selection of an OS. The power supply of the personal computer is applied after the switch 1 is set. Then a floppy disk FD is loaded to an FD device. A program address for rise of a personal computer system corresponding to an OS type set previously by the switch 1 is selected by an address switching circuit 5. Then the designated OS is read out of a BIOS storing circuit 6 by said program address. The circuit 3 rises the system with the designated OS and executes a program.

Description

DETAILED DESCRIPTION OF THE INVENTION 11.1 The present invention relates to a system start-up method using an O8 (operating system) of a personal computer, and particularly to a system start-up method from a system file storing a plurality of O8s.

Traditionally, personal computers of this type have floppy disk media as system files corresponding to various O8s, and a personal computer operator selects an O8 according to individual requirements and then installs the system. After exchanging the floppy disk medium as a file, the personal computer system is started up.

In the conventional personal computer described above, each time the O8 operated on the personal computer changes, after the floppy disk medium as the system file is replaced,
Since it is necessary to perform a system start-up operation of the personal computer, various complications arise when selecting a floppy disk medium compatible with the operating target O8.

11. The object of the present invention is to provide an O8 startup method that allows easy selection of an O8 to be operated on a personal computer with only simple operations.

The O8 start-up method according to the present invention is an operating system start-up method for a personal computer having system files storing multiple operating systems, and its feature is that the O8 start-up method according to the present invention is compatible with each of the operating systems. a storage means for storing a start-up program, a designation means for externally selectively designating an operating system to be operated, and a corresponding startup program in the storage means is derived in accordance with designation information from the designation means. A startup program deriving means is provided, and a corresponding operating system is started up using the derived startup program.

Song Dynasty 1 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system block diagram of an embodiment of the present invention,
1 is a slide switch, which is an external switch for selecting and specifying O8 to be operated on the microcomputer. 2 is a CPU control circuit that controls the CPU circuit 3, and 4 is a DMA (direct memory access) control circuit.

5 is an address switching circuit, and 8108 (Basic
Input Output System) Selects an address for the storage circuit 6 and inputs the address to the circuit 6.

The 8108 storage circuit 6 stores O8 startup programs corresponding to the O8s respectively stored in a plurality of FD (floppy disk) devices 14.

7 is the main memory circuit, 8 is the system status circuit, 9 is C
RT (cathode ray tube) display control circuit, 10 is FDD (floppy disk drive) II control circuit, 11 is peripheral device control circuit, 12 is system bus, 13 is CRT device,
Reference numeral 14 indicates an FDli device, and reference numeral 15 indicates various peripheral devices.

In this configuration, a floppy disk (FD) medium is prepared as a system file storing a plurality of O8s, and an O8 is sent to the CPU circuit 3 of the personal computer 1-'.
In this embodiment, an information signal that can set two types is created as an S type setting means.) After setting the slide switch 1, the computer system's lN1m
Execute input.

After that, convert the FD medium as the system file mentioned above to FD.
By installing the device [14], the personal computer system start-up program corresponding to the OS type preset by the slide switch 1 is switched to 8108 according to the operation address selected by the address switching circuit 5.
By being read from the storage circuit 6, the read O8 start-up program is executed by the CPU circuit 3.

The outline of the start-up process of a multi-OS personal computer system has been described above, and now it will be explained in detail based on FIG. 2, which is a detailed circuit diagram of a portion related to the constituent elements of the present invention.

The figure shows the details of the mutual relationship among the slide switch 1, address switching circuit 5, BIO8 storage circuit 6, and system bus 12 in FIG. 1. Slide switch 1 has two positions, O81 and 082, depending on the switch setting state.
This circuit has two types of O8'. O
The S type setting information signal 101 can express two level states: an "O" signal when the slide switch 1 is in the O81 state, and a "1" signal when the slide switch 1 is in the O82 state.

The address switching circuit 5 selectively specifies two input signal groups according to the OS type setting information signal 101, thereby selecting one of the two input signal groups as an output signal group.

Here, for the two input signal groups, of the address signal lines 219 to 20 of the address data 219 to 20 of the address bus 107 of the system bus 12, the input signal lines from 213 to 2° are common inputs, and only the signal @ line corresponding to 214 is a different input. It is said that To be more specific, the OS type setting information signal 101 is “0”.
” signal, that is, if it is the 081 type, 214 is the “0°” signal input, and the O8 rib setting information signal 101 is “1”.
In other words, if it is an O82 type, by setting 214 as a “1” signal input, the OS type setting information signal 101 is set to B.
By switching the address signal of the IO8 storage circuit 105, the memory space of the BIO8 storage circuit 105 is changed. As a result, for the 081 type, the memory space is from 00000 (HEX) to 03FFF (HEX) in hexadecimal representation of the address, and for the 082 type, the hexadecimal representation of the address is 00000 (HEX) to 03FFF (HEX).
It has 8108 storage areas of memory space from 4000 (HEX) to 07FFF (IIEX).

Note that HEX indicates hexadecimal representation.

Here, as a multi-OS personal computer, 20 degrees at 2 degrees from the address signal @219 of the address bus 107
Depending on the signal, it has a memory space of 1 megaword (1 word = 1 byte) and the address is displayed in hexadecimal rooooo (HE
X) is expressed as FFFFF (IIEX).

The BIO8 storage circuit 6 in FIG. 1 is composed of the BIO8 storage circuit 105 and address decode circuit 109 shown in FIG.
00000 (IIEX) to 07 F F F of the memory space of the 8108 memory circuit 105
Address decoding circuit 1 to specify (HEX)
09, and address bus signals 219 to 215 are all “0” signals, so the address decode circuit 109
The output permission signal 108 of the BIO8 storage circuit 105 is output from the BI08 memory circuit 105. As a result, BIOS program information 103 including a system startup program and a system monitor program is output to data bus 106, and the BIOS program is executed by CPU circuit 3.

1. Reconstruction 11. As explained above, according to the present invention, by making it possible to start up a personal computer system from a file medium as a system file storing a plurality of O8s, a personal computer operator can start up a personal computer system without complicated operations. This has the advantage that it is possible to easily select an O8 to operate on a personal computer.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a system according to an embodiment of the present invention, and FIG. 2 is a block diagram of a specific example of a portion of the blocks shown in FIG. Explanation of symbols of main parts 1...Slide switch 3...CPU circuit 5...Address switching circuit 6...-8108 storage circuit 12...System bus 14...FD device 105...BIO8 memory circuit

Claims (1)

[Claims] An operating system startup method for a personal computer having system files storing a plurality of operating systems, the method comprising: a storage means storing startup programs corresponding to each of the operating systems; and an operating system to be operated externally selected. a start-up program deriving means for deriving a corresponding start-up program in the storage means according to the specified information from the specifying means; An operating system startup method characterized in that an operating system is started up.