JPS61208158A - Personal computer - Google Patents

Abstract

PURPOSE:To reduce a mechanically movable part, to prolong its life and improve its reliability, and to attain high-speed access by permitting a ROM to serve as a floppy disk drive. CONSTITUTION:When a personal computer 1 is started up, a CPU 2 sends out a command for reading a program out of a floppy disk and transferring the program to the main storage 3 of the computer 1 to a ROM 10 corresponding to a floppy disk interface through a bus 4. The control circuit 11 in the ROM device 10 corresponding to the floppy disk interface decodes the received command to read a program stored previously in a ROM 12 instead of the program stored on the floppy disk and transfer the program to the main storage 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an external storage device for a personal computer, and particularly to a ROM device compatible with a floppy disk interface.

(Prior Art) Conventionally, in order to automatically start a program prepared in advance on a personal computer without human intervention, K has used a 70-tube disk device as shown in Fig. 3. An external storage device with a typical mechanical write/read function was used.

In Figure 3, 1 is a personal computer, 2 is a C
PU, 3 is a main memory, 4 is a CPU bus, 5 is a floppy disk control unit, and 6 is a floppy disk device. FIG. 4 is a block diagram showing details of the floppy disk controller 5 of FIG. 3.

In FIG. 4, 7 is a CPU bus interface circuit, 8 is a floppy disk control circuit, and 9 is a floppy disk device interface circuit.

In FIG. 3, the CPU of the personal computer 1
2. Sends a command to the floppy disk controller 5.
A method was adopted in which a program was transferred from the floppy disk device 6 to the main memory 3 of the personal computer 1 through the computer, and the program was started.

(Problems to be Solved by the Invention) Therefore, since a floppy disk device with mechanically movable parts is used, it is unreliable and unsuitable for continuous use over a long period of time. The drawback was that it required space other than the main body.

An object of the present invention is to replace a floppy disk device and a portion of a floppy disk device interface circuit with a ROM that has a long life, is highly reliable, has fast access speeds, and does not require space outside the main body of a personal computer. The object of the present invention is to provide a personal computer configured to eliminate the above-mentioned drawbacks and automatically start a program stored in a ROM in advance without human intervention.

(Means for solving the problem) A personal computer according to the present invention includes a CPU, a main memory, a ROM device, and a CPU bus, and the ROM built in the ROM device functions as a floppy disk device. It is configured so that it can be done.

In the above, the CPU is for executing arithmetic processing, and the main memory is for storing information necessary for the CPU's arithmetic operations.

A ROM device includes a large capacity ROM and a control circuit. The ROM is for storing programs used when the CPU executes arithmetic processing, and the control circuit transfers the programs stored in the ROM to the main memory in response to floppy control commands sent from the CPU. It is for transfer.

The CPU bus is for transferring information between the CPU, main memory, and ROM devices.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a personal computer according to the present invention. In FIG. 1, 1 is a personal computer, 2 is a CPU, 3 is a main memory, 4 is a CPU bus, and 10 is a ROM device compatible with a floppy disk interface. Figure 2 shows R corresponding to the floppy disk interface in Figure 1.
FIG. 2 is a block diagram showing details of the OM device 10. FIG. In FIG. 2, T is a CPU bus/turbine circuit, 8 is a control circuit, and 9 is a ROM.

Referring to FIG. 1 and FIG. 2, when the personal computer 1 is started up, the CP of the personal computer 1 is
U2 reads a program stored in a floppy disk to a ROM device 10 compatible with a floppy disk interface via the CPU path 4,
The program is stored in the main memory 3 of the personal computer 1.
Sends a command to transfer to.

ROM compatible with floppy disk interface
The control circuit 11 inside the device 10 decodes the received command, reads a program previously stored in the ROM 12 instead of the program stored on the floppy disk, and stores this program in the main memory 3 of the personal computer 1. Transfer to.

In this way, a pre-prepared program can be started automatically without manual intervention.

(Effects of the invention) As explained above, by using the ROM when automatically starting a program, the device has fewer mechanically moving parts, has a longer lifespan, and is highly reliable. This also has the effect of increasing access speed, and also eliminates the need for space other than the personal computer.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a personal computer using a ROM according to the present invention. FIG. 2 is a block diagram showing in detail an embodiment of a ROM device compatible with the floppy disk interface 7A 7 shown in FIG. FIG. 3 is a block diagram showing an example of a personal computer using a floppy disk device according to the prior art. FIG. 4 is a block diagram showing an example of the floppy disk control section shown in FIG. 3. 1... Burnal computer 2... CPU 3... Main memory 4... CPU bus 5... 70 disk controller 6... Floppy disk device 7... CPU path interface circuit 8...・Floppy disk control circuit 9...Interface circuit 10...ROM device 11...Control circuit 12 ・ ・ ・ROM

Claims (1)

[Claims] a CPU for executing arithmetic processing; a main memory for storing information necessary for the arithmetic operations of the CPU;
A large-capacity ROM that stores a program used when U executes the arithmetic processing, and a ROM that stores a floppy control command sent from the CPU.
a ROM device including a control circuit for transferring a program stored in the main memory to the main memory; a CPU bus for transferring information between the CPU, the main memory, and the ROM device; A personal computer characterized in that a ROM is configured so that it can function as a floppy disk device.