JPH02267794A - Memory card - Google Patents

Abstract

PURPOSE:To make a system light-weight and to execute a correspondence to many kinds of operating systems by including a read-only memory built in the operating system and a connector attachable and removable to an external device. CONSTITUTION:A memory card 1 main body can be attached and removed to and from a computer system by inserting and pulling a connector 3 to the computer system not to be indicated in a figure. To ROMs 4 and 5 on a multilayer substrate 2, the programs of the operating systems are stored, and to RAMs 6-9, the programs of users are stored. A control part 10 controls the selection of the ROMs 4 and 5 and RAMs 6-9 by addresses from the external part. A power source control part 11 receives the supply of the power from the computer system through the connector 3, and when the supply of the power is not executed through the connector 3, the power is supplied from a battery 12 for conserving contents to the RAMs 6-9. Outer covers 14 and 15 protect a memory cell, etc., on the multilayer substrate 2 from the influences of a magnetism, an electric field and a pressure.

Description

TECHNICAL FIELD The present invention relates to memory cards, and more particularly to a method for storing operating systems used in small personal computer systems.

BACKGROUND OF THE INVENTION Conventionally, operating systems of this type have been built into computer systems, either stored on a magnetic storage medium such as a floppy disk, or stored in read-only memory.

In such conventional computer systems, when an operating system is stored on a magnetic storage medium, a magnetic storage device with a rotation mechanism and a precision mechanism for head movement is required, especially in small personal computer systems. In this case, the weight of these mechanical parts becomes a problem.

Additionally, if the operating system is stored in read-only memory and built into the computer system,
There is a problem that it cannot support many types of operating systems, and if the wrong operating system is selected, the computer system will have low versatility.

Additionally, when an operating system is built into a computer system, a magnetic storage device is required to store the user's programs.

OBJECTS OF THE INVENTION The present invention has been made to eliminate the above-mentioned problems of the conventional system, and it is possible to reduce the weight of the system.
The purpose is to provide a memory card that can be compatible with many types of operating systems.

Structure of the Invention A memory card according to the present invention is characterized in that it includes a read-only memory containing an operating system and a connector that can be attached to and detached from an external device.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In the figure, a memory card main body 1 has a connector 3 on a multilayer board 2, a read-only memory (hereinafter referred to as ROM) 4.5, and random access memories (hereinafter referred to as RAM) 6 to 9.
, an address decoding and control section (hereinafter referred to as the control section) 10, a power supply control section 11, and a content storage battery 12. screw hole 13
It is screwed in place.

The memory card main body 1 can be attached to and removed from a computer system (not shown) by inserting and removing the connector 3 into the computer system.

The multilayer board 2 connects the mounted circuits and also maintains the structure of the memory card body 1.

That is, a flexible insulator (not shown) is provided between the multilayer substrate 2 and the memory cells to prevent damage to the memory cells due to bending of the multilayer substrate 2 or the like.

Here, the memory cells of RAM6 to 9 are mounted on the multilayer substrate 2 and bonded directly to the multilayer substrate 2,
The top is sealed with plastic.

The ROM 4.5 on the multilayer board 2 stores an operating system program, and the RAMs 6 to 9 store user programs.

Further, in these RAMs 6 to 9, even if the memory card body 1 is removed from the computer system, the content can be saved by the content storage battery 12.

The control unit 10 controls which memory cell (ROM 4.5 and RAM 6 to 9) is selected based on an external address.

The power control unit 11 checks whether power for reading or writing is normally supplied from the computer system via the connector 3, and detects abnormalities in the power supply or connector 3.
If there is no power supply via
The contents of the RAMs 6 to 9 are saved by controlling the power source 2 to be supplied to the RAMs 6 to 9 together. Further, static electricity generated in the memory card body 1 is also absorbed here.

The outer covers 14 and 15 are made of metal that has a shielding effect against external magnetic and electric fields, and protect the memory cells and chips mounted on the multilayer substrate 2 from the effects of magnetic fields, electric fields, and pressure. are doing.

FIG. 2 is a diagram showing how the RAM 6 shown in FIG. 1 is attached to the multilayer board 2. In the figure, a memory cell 6a constituting a RAM 6 is connected to ground bases 21a, 21c on a multilayer substrate 2 by bonding wires 17a, 17b, and there is no space between the memory cell 6a and a ground base 21b on the multilayer substrate 2. A flexible insulator 18 is included.

In addition, board inner layer patterns 22 to 25 are provided in the multilayer board 2, and among these, the board inner layer pattern 23 and a ground base 21a connected to the RAM 6 are electrically connected via a through hole 26. There is.

Furthermore, the memory cell 6a is covered with an insulator 19, one of which is covered with a plastic cover 16.

Here, the ground bases 21a to 21c on the multilayer substrate 2
has a heat dissipation effect and a shielding effect, and the insulator 18
．． 19 is made of a material with high insulation, thermal conductivity, and flexibility.

FIG. 3 is a diagram showing a memory map according to one embodiment of the present invention. In the figure, the capacity of ROM4.5 is 51
The memory map is shown when the memory capacity is 2 kilobytes and the capacity of RAMs 6 to 9 is 1 megabyte each.

In Figure 3(a), the start address of ROM4.5 is '000'.
000' (7) In the case shown in FIG. 3(b), ROM4
．． FIG. 3(c) shows the case where ROM 4.5 and RAMs 6 to 9 are in a bank configuration.

When ROM 4.5 and RAM 6 to 9 are in a bank configuration, the start address of ROM 4.5 can be banked with RAM 6 to 9 by setting the address to the nth power of 2, which is compatible with many computer systems. connection is possible.

FIG. 4 is a diagram showing connections of the main circuits of FIG. 1. In the figure, when the start address of the ROM 4 is input from the outside via the connector 3 and the signal line 100, the control unit 10 holds the start address, and from then on, the area of the ROM 4 starts from the address specified by the start address. .

The control section 10 also includes a connector 3 and a signal line 1.
ROM4 or RAM6 from outside via 01, 102
When the address and data for access are input, it is determined whether the access is to ROM4 or RAM6.

That is, when the control unit 10 determines that the ROM 4 is to be accessed based on the input address and data, the ROM address bus 10B and the internal data bus 1 are
The address and data inputted to the ROM 4 are outputted via the RAM 07, and when it is determined that the RAM 6 is to be accessed based on the inputted address and data, the inputted address and data are outputted via the RAM address bus 108 and the internal data bus 107. and outputs it to RAM6.

Furthermore, the control unit 10 performs banking within the same address for the ROM 4 and RAM 6 when the external bank-on signal input via the connector 3 and the signal line 104 is on, and when it is off, is ROM4 and R
Banking within the same address is not performed for AM6. However, the start address of ROM4 is 104g57B'
In this case, the ROM4 and RAM6 are not banked.

When the bank-on signal to the control section 10 is on, that is, when performing banking between the ROM 4 and the RAM 6, when the external page signal input via the connector 3 and the signal line 1o3 becomes true, the control section 10 is turned on. 1
0 performs page switching of read data.

The power control unit 11 connects the connector 3 and the signal line 10
5, and if the power is being supplied normally, the ROM4 and RAM6 are connected via signal lines 109 and 110.
Power is supplied to the control unit 10 and the control unit 10, respectively.

In addition, when the power supply control unit 11 detects an abnormality in the power supply or when it detects that the power is not supplied, the content storage battery 1 is inputted via the signal line 111.
The power supply from 2 is connected to ROM4 via signal lines 109 and 110.
and is supplied to the RAM 6 and the control section 10, respectively.

In this way, a plurality of memory card bodies 1 can be prepared by mounting the ROM 4.5 in which the operating system program is stored and the connector 3 which can be attached and detached to a computer system in the memory card body 1. ROM4.5 of those memory card body 1
By storing different types of operating systems for each computer, it is possible to support many types of operating systems by simply inserting the memory card body 1 with the corresponding operating system stored into the computer system. can.

Further, since the start address of the ROM 4.5 in which the operating system program is stored can be set at any location on the memory, connection to many computer systems is possible.

In addition to the ROM 4.5, the memory card body 1 is equipped with RAMs 6 to 9 whose contents can be stored using a storage battery 12, so that user programs can be stored in the RAMs 6 to 9. Since the system does not require a magnetic recording device, it is possible to achieve a significant weight reduction, and there is no need to take measures to prevent the influence of external magnetism.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the weight of the system can be reduced by mounting a read-only memory with a built-in operating system and a connector that can be attached to and detached from an external device on a memory card. It has the advantage of being able to support many types of operating systems.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing the attachment of the RAM shown in FIG. 1 to a multilayer board, and FIG. 3 is a diagram showing a memory map according to an embodiment of the invention. , FIG. 4 is a diagram showing connections of the main circuits of FIG. 1. Explanation of symbols for main parts 1...Memory card body 2...Multilayer board 3...Connector 4.5...Read-only memory 6-9... ...Random access memory 10...
... Address decoding and control section 11 ... Power supply control section 12 ... Content storage battery 14.15 ... Outer cover

Claims (1)

[Claims] (1) A memory card characterized by including a read-only memory with a built-in operating system and a connector that can be attached to and detached from an external device.