JPH01303692A - Option ROM carrier mounting method - Google Patents

Abstract

PURPOSE:To prevent the generating of damage when a ROM carrier is pulled out erroneously by providing a detecting means to detect that the optional ROM carrier is removed from a installing part at the main body side of electronic equipment and acting a protecting means connected to the detecting means. CONSTITUTION:At the side face of an installing part 2, a spring member 23 is provided with its one side engaged to a micro-switch 24 as a detecting means. Then, when an IC card 1 is pulled out while a processor 31 is traveling the program of a ROM 12, the micro-switch 24 is made off by the detecting means 23, an interrupting requiring signal is inputted to the processor 31, the processor 31 stops the processing in practicing immediately, and control is moved to the interrupting processing program of a resident ROM 32. Besides, the processor 31 can be made in a reset condition with connecting to the RESET terminal of the processor 31. Thus, when the ROM carrier 1 is pulled out erroneously, the generating of damage can be prevented without falling into control impossible with the microprocessor 31.

Description

[Detailed Description of the Invention] [Summary] Regarding the installation method of an option ROM carrier storing an interface program for various hosts of an electronic device connected to a plurality of types of hosts, an internal download ROM carrier is disclosed.
R without necessarily being equipped with AM or resident ROM.
The purpose of this is to prevent the microprocessor from going out of control and to prevent damage if the OM carrier is pulled out by mistake.
The present invention is configured to include a detection means for detecting a disconnection of the connection between the ROM and the electronic device, and a protection means for protecting the electronic device from abnormality caused by the disconnection.

[Industrial application field]

The present invention relates to a method for installing an option ROM carrier in an electronic device, and more particularly to a method for installing 78 option ROMs storing interface programs for various hosts in an electronic device connected to a plurality of types of hosts.

[Conventional technology]

In recent years, option ROMs using IC cards and slot materials have become extremely popular.This is because ICs have become larger in capacity, smaller and lighter, and do not require read/write heads or drive units. This is because the convenience of only having to make an electrical connection is useful.

Option ROMs such as IC cards are sometimes used in electronic devices controlled by microprocessors, such as serial printers and page printers, and especially in the case of printers that are connected to multiple types of hosts, two or more ROMs may be used. Another method has been used in which ROM cards can be installed, one of which stores interface programs for various hosts.

[Problem to be solved by the invention]

When a program for a microprocessor of an electronic device is stored in an option ROM and used, the following two cases are possible.

(1) After transferring the ROM data to the RAM in the electronic device and downloading it, the program is run on the RAM.

(2) Connect the ROM and the main unit via a bus and run the program in the ROM directly.

However, with the former, it is necessary to prepare a RAM memory with the same capacity as the ROM or more, and with the latter, if a card, etc. is accidentally removed while the program is running, the processor of the main unit cannot be controlled. There is a risk that this may lead to inconveniences such as overheating.

The present invention was created in view of these problems, and
The purpose of the present invention is to provide a mounting method for an option ROM carrier that does not cause the microprocessor to lose control or cause damage if the ROM carrier is accidentally pulled out, even if there is no download RAM or resident ROM inside. There is.

[Means to solve the problem]

In the present invention, means for solving the above problems are as follows:
Option R of an electronic device, in which a part of the main body or unit of an electronic device connected to multiple types of hosts includes a mounting section, and an option ROM carrier storing an interface program with various hosts is removably mounted on the mounting section.
In the OM carrier mounting method, option R to the mounting part
The present invention is characterized by comprising a detection means that detects a disconnection of the connection between the ROM and the electronic device in conjunction with the attachment and detachment of the OM carrier, and a protection means that protects the electronic device from abnormalities caused by the disconnection. This is a system in which one option ROMJE is installed.

[Function] In the present invention, a detection means is provided on the main body side of the electronic device to detect that the option ROM carrier has been removed from the mounting part, and the protection means connected to the detection means is activated to prevent the occurrence of any occurrence in the electronic device. This is to prevent abnormalities that may occur.

The detection means of the present invention is designed to mechanically (not circuit-wise) detect the attachment/detachment operation of the option ROM carrier, and physically detects when the ROM carrier is detached from the mounting portion. The detection signal is converted into an electrical signal or is physically transmitted as is to the protection means, and the protection means maintains the control function of the processor using software or a circuit.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention.

In the figure, 1 is an IC as an option ROM carrier.
The card 2 is an IC card mounting part of an electronic device. IC
The card 1 has a built-in ICROM, and a contact 11, which is a lead terminal thereof, is arranged at one edge of the card.

The mounting part 2 is formed in a part of the electronic device main body, and has an insertion opening 2.
1 is opened, and the IC card 1 is inserted therein.

The contacts 11 of the IC card 1 are located in the hollow interior of the mounting portion 2.
A plurality of connection pins 22 protrude at positions corresponding to the contact points 11, and when the IC card 1 is inserted, they come into contact with each of the contacts 11. A spring member 23 is disposed on the side surface of the mounting portion 2 as a detection means of the present invention, with one end of the spring member 23 engaged with a microswitch 24 . Hanging member 2
3 is introduced into the interior through an opening on the side of the mounting section 2, and is normally biased to rotate in the direction of the insertion opening 21 of the mounting section 2, and when the IC card 1 is inserted, Part I
The C card is configured to push the spring member 23 in the insertion direction against the bias, thereby turning on the microswitch 24. When the IC card 1 is pulled out, the spring member 23 is biased back toward the insertion slot 21, turning the microswitch 24 off. In addition, micro switch 2
4 is fixed to a part (not shown) of the main body of the electronic device.

FIG. 2 is a circuit configuration diagram of an embodiment of the present invention. Second
In the figure, 1 is an IC card, and 3 is the main body of the electronic device. The IC card 1 has a built-in option ROM 12, and the main body 1 has a built-in ROM 32 that stores a processor (CPU) 31 of the electronic device and an interrupt processing program.

One end of the microswitch 24 is connected to the frame ground, and the other end is connected to the interrupt terminal of the processor 31, and also to the power supply 5 through a resistor. Therefore, when the microswitch 24 is in the on state, the interrupt signal is "L", and when it is in the off state, it becomes 'H' and an interrupt is generated in the processor 31.

When the IC card 1 is attached to the main body 1 at the attachment section, the ROM 12 and the processor 31 are connected by an address bus and a data bus through the contacts 11 and the contact pins 22, and the processor 31 runs the program in the ROM 12. Various processes will be executed.

FIG. 3 is a flowchart of the processing of the above embodiment.

When the IC card 1 is pulled out while the processor 31 is running the program in the ROM 12 of the IC card 1, the detection means turns off the microswitch 24 and an interrupt request signal (IRQ) is input to the processor 31. Ru. The processor 31 immediately stops the process being executed and transfers control to the interrupt processing program in the resident ROM 32. The interrupt processing ends when the same IC card 1 as before is reinserted.

FIGS. 4 and 5 are a perspective view and a circuit configuration diagram of another embodiment of the present invention. In this embodiment, in addition to the connection pin 22, a current-carrying pin 25 is added to the mounting portion 2 as a detection means, and a contact 11 on the IC card 1 side is also added accordingly to serve as a switch for attaching and detaching the IC card 1. . As shown in FIG. 5, in the IC card 1, the added contacts are connected to the frame ground, and the energizing pin 25 is connected to the RESET terminal of the processor 31 in the main body 3. As a result, when the IC card 1 is removed, the pro sensor 31 is in a reset state, and when the IC card 1 is inserted,
Once connected, the reset is canceled and the R of IC card 1 is
The program in OM12 is executed. The advantage of this method is that the resident 1-ROM is not required, and even if the same IC card 1 as before is reinserted instead, the continuation of the process cannot be resumed, but damage to the main body 3 can be prevented. can definitely be done.

For convenience of explanation, the first embodiment shows the interrupt terminal input, and the second embodiment shows the RESET terminal input. However, it is of course possible to input a signal from a microswitch to the RESET terminal, A signal from the pin may be input to the interrupt terminal.

〔Effect of the invention〕

As described above, according to the present invention, even if there is no internal download RAM or resident ROM, R
It is possible to provide a mounting method for the option ROM 1B body in which the microprocessor does not go out of control and is not damaged when the OM carrier is pulled out by mistake.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a circuit configuration diagram of an embodiment of the invention, Fig. 3 is a flowchart of processing in the embodiment, and Figs. 4 and 5 are in accordance with the invention. FIG. 2 is a perspective view of another embodiment of the present invention and a circuit configuration diagram thereof. 1; IC card, 2; Mounting part, 3; Main body, 11; Contact, 12; Option ROM. 21; insertion port, 22; connection pin, 23; spring member, 24; microswitch, 25; energizing pin, 31; processor (CPU), 32; resident ROM. 24 Micro switch Fig. 1 Fig. 2 Flowchart of the flowchart of the Qμ procedure Fig. 3

Claims (1)

[Claims] An option ROM that includes an attachment part (2) in a part of the main body or unit of an electronic device that is connected to multiple types of hosts, and stores interface programs with various types of hosts.
In a mounting method for an option ROM carrier of an electronic device in which a carrier (1) is removably mounted on the mounting portion (2), the option ROM carrier (1) is attached to and removed from the mounting portion (2), and the ROM and Installation of an option ROM carrier characterized by comprising a detection means (24) for detecting a disconnection of the connection with an electronic device, and a protection means (32) for protecting the electronic device from abnormalities caused by the disconnection. method.