JP3122304B2 - Portable computer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable computer having a common connection port for a mouse and a joystick.

[0002]

2. Description of the Related Art In recent years, various types of application software have been developed for small personal computers such as a laptop type and a book type which are easy to carry, as the processing speed is increased and the storage capacity is increased. Was.

[0003] Under such an environment, an external interface mechanism that enables connection of various IO devices is required on computer hardware in order to meet the demands of various applications.

Conventionally, as a means for meeting these demands, a method of connecting a desired IO device to an expansion slot via an adapter has been adopted. However, such an expansion means has a problem that a dedicated adapter must be prepared as an optional device, and the functionality is impaired because the expansion slot cannot be used for another expansion.

For example, when trying to execute an application using a joystick and a sound source board, the application using the joystick and the sound source board cannot be executed because the expansion slot is occupied by the adapter of the joystick.

A conventional personal computer of this type has an external device connection mechanism such as a PS2 keyboard and a PS2 mouse, but does not have a connection mechanism for other external input devices including a joystick.

At this time, in order for the system to handle the operation information of the joystick, an interface mechanism specific to the joystick for extracting a change in resistance according to the operation amount as a change in pulse cycle is required.

Therefore, it is conceivable to provide a dedicated connection mechanism for the joystick in the main body of the device.
A dedicated connection mechanism for the joystick and its mounting space must be secured, and the device becomes larger and more complicated.Also, from the viewpoint of system management, the joystick is added to various input devices such as a mouse and keyboard. There is a problem that device management including levels becomes complicated, and firmware control becomes complicated.

[0009]

As described above, conventionally, it is impossible to execute an application using both a joystick and an optional device such as a sound source board, and there is a problem that application functions are restricted. When a dedicated connection mechanism is provided for the joystick, a dedicated connection mechanism for the joystick and its mounting space must be ensured, which increases the size and complexity of the device itself and interrupt levels from the viewpoint of system management. The device management including the above becomes complicated, and the firmware control becomes complicated.

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a portable computer in which a joystick can be connected with a simple and easy configuration and control by effectively using an existing mouse connection port without causing complicated device configuration and device management.

[0011]

Means and operation for solving the problems] The present invention, Ma
Mouse or joystick is selectively connected, first
External device connection port having a first group of pins and a second group of pins
Among the plurality of pins of the external device connection port,
First input that performs mouse input processing using one pin group
The processing circuit and a plurality of pins of the external device connection port.
That is, using the first pin group and the second pin group
Input processing to perform the input processing of the joystick
Out of the pins of the circuit and the external device connection port.
The second pin used for joystick input processing
Joystick connection by monitoring group voltage
Joystick connection recognition circuit to recognize the presence or absence
The joystick connection recognition circuit
When the connection of the first pin is recognized,
The input destination of the predetermined signal input from the first input processing circuit
A switch circuit for switching to the second input processing circuit.
A joystick using the second group of pins
Receiving scanning signals in the x direction and the y direction
And In the present invention, the first pin group and the second pin group
Use an external device connection port with
Mouse using the second group of pins
Signal from a joystick with a different signal format
In addition, the voltage of the second pin group is monitored.
The joystick connection automatically
And commonly used by mouse and joystick
The input destination of the signal from the first pin group
Input processing circuit for processing a signal input of a different format
Is adopted. This allows
The signal from the joystick itself must be improved
You can use an existing joystick with a normal mouse
Just connect to the joystick and use the joystick.
Can be used.

[0012]

[0013]

In these configurations, a connection port common to a mouse and a joystick that enables connection of a joystick can be easily realized by using a connection port of a PS2 mouse, for example. That is, a part of the signal of the joystick, for example, the operation amount signal, is assigned to an unused pin of the DIN 6 pin jack for the plug of the PS2 mouse which is not used in the PS2 mouse. This allows PS2
One port can be commonly used by a mouse and a joystick by simple switch control by effectively using unused pins in a mouse connection mechanism.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a portable computer according to an embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a system bus used for data transfer between a CPU 11, various memories including a main memory 12, and various input / output devices including a joystick. ISA-BUS).

The CPU 11 controls the entire system, and has a function of displaying various operation menus on the screen and a function of executing various processes specified by the user on the operation menu screen. . Here, in the setup process according to the control program stored in the system ROM 25, various setting processes on the setup screen shown in FIG. 4 are executed, and the external device recognition process as shown in FIG. Execute.

The main memory 12 stores programs and data to be processed. The main memory 12 has a storage capacity of 4 Mbytes and 640 Kbytes of the first 1 Mbytes.
The bytes are used as system memory and the remaining 384
K bytes are used as a work area. A part of the 4 MB of the main memory 12 except for the system memory area described above can be set as a hard RAM or an EMS memory.

The additional memory 13 is a 2 Mbyte / 4 Mbyte / 8 Mbyte / 16 Mbyte memory card,
Attached as needed for memory expansion. It is also possible to set the above-mentioned hard RAM or EMS memory in the memory area extended by the additional memory 13.

The system bus 10 includes a DMA controller 14, an interrupt controller 15, a timer 16,
And a real-time clock (RTC) 17 and the like, and a backup RAM 18 can be optionally connected.

The real time clock (RTC) 17 is
This is a clock module having a unique operation battery, and has a CMOS static RAM that is always supplied with power from the battery. This static RAM (CM
The OS memory) is used for storing setup information indicating the system configuration. Here, in the external device recognition process shown in FIG.
Among the setting information stored in the MOS memory, the setting information of the sound function and the setting information of the mouse / joystick port are referred to.

The backup RAM 18 is a battery that is backed up by a battery and has a storage capacity of 32 Kbytes. This backup RAM 18 has system environment setting information (CON) set by the user.
FIG, SYS).

The system bus 10 further includes a kanji ROM 1
9, dictionary ROM 20, DOS ROM 21, application ROM 22, PC card controller 23, menu ROM 24, system ROM 25, etc. are connected.

The kanji ROM 19 has a storage capacity of 1 Mbyte (64 Kbytes × 16 pages), in which various kanji fonts are stored. Dictionary ROM 20
Has a storage capacity of 512 Kbytes (64 Kbytes × 8 pages) and is used as a Kanner-Kanji conversion table.

The DOSROM 21 has 512 Kbytes (6
It has a storage capacity of 4K bytes x 8 pages), in which an operating system such as DOS (Disk Operating System) is stored in advance. Also, this DO
The SROM 21 stores a menu display program as an automatic execution batch file executed when the operating system is started.

The application ROM 22 has 512K
It has a storage capacity of bytes (64 Kbytes × 32 pages), and has a memory area for storing a spreadsheet program and a memory area for storing a word processor program.

The PC card controller 23 is a JEID
It has a slot for a PCMCIA card conforming to the A standard and has an input / output interface processing function for a card inserted into the slot.

The menu ROM 24 stores 1 Mbytes (16
It has a storage capacity of (K bytes x 64 pages), in which icons displayed on the menu screen and PIM programs for managing personal information such as schedules and address books are stored.

The system ROM 25 is a flash ROM
And has a storage capacity of 128 Kbytes. Here, a bootstrap program and various basic input / output programs (BIOS; Basic I / O System) are stored. Here, an initialization program having an external device recognition processing routine as shown in FIG. 3 is stored.

In the system bus 10, as input / output controllers, an FDD controller 31, a printer controller 32, a joystick controller 33, a sound controller 34, a keyboard controller 3
5. Display controller 36, RS-232C controller 38, TV controller (T-CNT) 39
Etc. are connected.

The FDD controller 31 controls a floppy disk drive (FDD) 41 for driving a 3.5-inch floppy disk. The floppy disk drive (FDD) 41 is 720K bytes / 1.2M
This is a three-mode drive that supports three types of recording formats of byte / 1.44 Mbytes. The FDD controller 31 also controls a 5-inch floppy disk drive, which is optionally connected via an FDD / printer connector. Printer controller 32
Controls an external printer that is optionally connected via the FDD / printer connector.

A joystick controller (J-CN)
T) 33 performs input processing according to the operation amount of the joystick 70 connected to the mouse / joystick connection port 60 using the connection port (DIN 6-pin jack) of the PS2 mouse.

The sound controller 34 generates an analog audio signal and outputs it to an audio output terminal TC of the AV terminals. The analog sound signal generation function of the sound controller 34 is a “sound function” shown in FIG.
Becomes valid when is set to "valid".

Keyboard controller (KBC) 35
Controls the 85-key built-in keyboard 42 and mouse (80). The display controller 36 controls read / write of an image memory (VRAM) 37 and
The display control of a monochrome liquid crystal display (LCD) 43 having a resolution of 40 × 400 dots is performed.

The RS-232C controller 38 controls the RS
-232C equipment is controlled. TV controller (T
-CNT) 39 converts display data (TFT color display data) output from the display controller 36 into T
The data is converted into V (color television) display data and output to a TV video output terminal (S terminal TA and video terminal TB).

Reference numeral 44 denotes a power supply controller for supplying operating power and backup power to each unit in the portable computer. Reference numeral 51 denotes a joystick connection detection unit (JD) that detects whether or not the joystick 70 is connected to the mouse / joystick connection port 60 using the connection port (DIN, 6-pin jack) of the PS2 mouse. The configuration of the joystick connection detection unit (JD) 51 is shown in FIG.

Reference numeral 52 denotes a switching circuit (SW) for switching the circuit connection of the mouse / joystick connection port 60 according to a detection signal of the joystick connection detection unit 51.
Here, when the detection signal of the joystick connection detection unit 51 is “1” indicating the connection state of the joystick 70, the joystick controller (J-CNT) 33 is connected to the mouse / joystick connection port 60 by circuit. The circuit configuration of the switching circuit (SW) 52 is shown in FIG.

Reference numeral 53 denotes a TV video output terminal (S terminal TA,
And a TV connection detection unit for detecting whether or not a TV (television) is connected to any of the video terminals TB).
FIG. 2 shows the joystick connection detection unit (JD) 51,
FIG. 2 is a block diagram showing a configuration of a switching circuit (SW) 52 and a circuit configuration of a mouse / joystick connection port 60 using a connection port (DIN, 6-pin jack) of a PS2 mouse.

Mouse / joystick connection port 60
Indicates that 4 pins (P3 to P6) of the 6 pins (P1 to P6) are PS
2 Used to connect mouse 80, remaining 2 pins (P1, P2)
Are unused pins. In this embodiment, this PS
2 Pins (P1, P2) not used by the mouse 80 are assigned to xy operation signals of the joystick 70.

Each signal of the two pins (P1, P2) assigned to the x / y operation signal of the joystick 70 is supplied to the joystick controller (J-CNT) 33 as an operation input signal, and a joystick connection detection unit ( JD) 51.

Joystick connection detector (JD) 51
Includes two comparators 51a and 51b, an OR circuit (OR) 51c, and an IO register (IO-Reg) 51d.
Are provided.

The comparator 51a compares the voltage on the pin (P1) of the mouse / joystick connection port 60 to which the x operation signal of the joystick 70 is supplied with the reference voltage (Re).
f), when the voltage on the x operation signal path is higher than the reference voltage (Ref), a "1" level detection signal (Dx) indicating that the joystick 70 is connected to the mouse / joystick connection port 60 ) Is output.

The comparator 51b compares the voltage on the pin (P2) of the mouse / joystick connection port 60 to which the y operation signal of the joystick 70 is supplied with a reference voltage (Re).
Compared with f), when the voltage on the y operation signal path is higher than the reference voltage (Ref), a detection signal (Dy) of "1" level indicating that the joystick 70 is connected to the mouse / joystick connection port 60 ) Is output.

The OR circuit 51c connects the joystick 70 to the mouse / joystick connection port 60 when at least one of the output signals of the comparators 51a and 51b is "1". Is output as a "1" level detection signal.

The IO register (IO-Reg) 51d is
CPU 1 via system bus (ISA-BUS) 10
In this case, the detection signal output from the OR circuit (OR) 51c is stored in a bit b5, and the switching control signal sent from the CPU 11 is stored in a bit b3.

The switching circuit (SW) 52 includes an IO register (IO-R) provided in the joystick connection detecting section 51.
eg) In accordance with the switching control signal stored in bit b3 of 51d, a part of the signal path of mouse / joystick connection port 60 (here, on pins P4 and P5 for passing the mouse clock signal (CLK) and data (DATA)). Are switched between the joystick side (the signal input end of the joystick controller (J-CNT) 33) and the mouse side (the signal input end of the keyboard controller (KBC) 35). Here, the IO register (IO-
When the switching control signal of the bit b3 of the (Reg) 51d is “1”, the signal lines of the pins P4 and P5 are connected to the signal input terminal of the joystick controller (J-CNT) 33.

The joystick 70 has operation amount detectors in the x and y directions and two operation buttons (switches).
Is provided. Further, the PS2 mouse 80 is provided with a control processor (MP) that outputs data (DATA) according to the operation amount and operation direction in accordance with the input clock (CLK).

FIG. 3 is a flowchart showing an external device recognition processing procedure executed in the initialization processing routine in the above embodiment. FIG. 4 shows a setup (system setup) screen in the above embodiment. Here, the cursor is moved to the "mouse / joystick port" item of block 8 and the horizontal cursor key "→" is operated. With "Automatic recognition" as the default, the selection changes in the order of "Automatic recognition" → "Joystick fixed" → "Mouse fixed", and "Enter"
By operating the key, the selected content is determined (set). The selection of the "sound function" item is determined (set) by the same operation. The contents set on this setup screen are stored in the CMOS memory (static RAC) of the real-time clock (RTC) 17.
M) and is referred to in the external device recognition processing shown in FIG. 3 in the initialization processing routine.

FIG. 5 shows "automatic recognition" in the above embodiment.
This indicates the contents of the switching control signal of the bit b3 of the IO register (IO-Reg) 51d in each of the modes "fixed joystick" and "fixed mouse". In external device recognition processing,
When recognizing that the joystick 70 is connected to the mouse / joystick connection port 60,
The switching control signal of "1" is set.

Here, the operation of the embodiment of the present invention will be described with reference to the above drawings. The usage mode of the mouse / joystick connection port 60 is set on the setup screen shown in FIG. That is, on the setup (system setup) screen shown in FIG. 4, the cursor is moved to the “mouse / joystick port” item of the block 8 and the horizontal cursor key “→” is operated to “automatic recognition”.
Is selected as a default, the selection is switched in the order of “automatic recognition” → “fixed joystick” → “fixed mouse”, and by operating the “Enter” key, the selection is confirmed (set). The selection of the "sound function" item is determined (set) by the same operation.
The contents set on this setup screen are stored in the CMOS memory (static RAM) of the real-time clock (RTC) 17 and are referred to in the external device recognition processing shown in FIG. 3 during the initialization processing routine.

In the initialization processing at the time of system startup, an external device recognition processing shown in FIG. 3 is executed. That is,
The CPU 11 executes the external device recognition processing shown in FIG. 3 according to the control program in the system ROM 25.

In this process, first, the CMOS memory of the real-time clock (RTC) 17 is accessed, and it is determined whether or not the “sound function” is set to “valid” from the set contents of the setup (FIG. 3). Steps S1 and S2).

When the "sound function" is set to "invalid", the bit b3 of the IO register (IO-Reg) 51d provided in the joystick connection detection unit 51 is switched to the "0" level. The control signal is set (step S8 in FIG. 3).

When the "sound function" is set to "valid", the setting contents of the "mouse / joystick port" are set to "automatic recognition" mode or "fixed joystick" from the contents of the CMOS memory. It is determined whether the mode is the mode or the "mouse fixed" (steps S3 and S6 in FIG. 3).

Here, when the setting contents of the "mouse / joystick port" are in the "automatic recognition" mode,
The detection signal content of the bit b5 of the IO register (IO-Reg) 51d provided in the joystick connection detection unit 51 is checked three times at predetermined time intervals, and when two or more times are "1", the IO register (IO-Reg) is checked. IO-Reg)
The bit b3 of 51d is set to "1" (steps S4, S5, S7 in FIG. 3).

At this time, the joystick connection detecting section 51
The comparator 51a of the joystick 70 compares the voltage on the pin (P1) of the mouse / joystick connection port 60 to which the x operation signal of the joystick 70 is supplied with the reference voltage (Ref), and determines the voltage on the x operation signal path as the reference voltage (Ref). If the value is higher than the above value, a detection signal (Dx) of "1" level indicating that the joystick 70 is connected to the mouse / joystick connection port 60 is output. Also, the comparator 5
1b is a pin (P) of the mouse / joystick connection port 60 to which the y operation signal of the joystick 70 is supplied.
2) Compare the above voltage with the reference voltage (Ref), and when the voltage on the y operation signal path is higher than the reference voltage (Ref),
Joystick 7 to joystick connection port 60
A detection signal (Dy) of "1" level indicating that 0 is connected is output. Each of these detection signals is connected to an OR circuit (O
R) 51c.

The OR circuit (OR) 51c connects the joystick 70 to the mouse / joystick connection port 60 when at least one of the output signals of the comparators 51a and 51b is "1". Is output as a "1" level detection signal. This detection signal is an IO register (IO-Reg)
Set to bit b5 of 51d. The content of this bit b5 is read three times in the above automatic recognition processing.

In the above automatic recognition processing, if the value is not "1" two or more times, the IO register (IO-Reg) 51
A "0" level switching control signal is set in bit b3 of d (step S8 in FIG. 3).

The IO register (IO-Reg) 51d
The content of the bit b3 of the switching circuit (S
W) 52. According to the switching control signal stored in the bit b3 of the IO register (IO-Reg) 51d, the switching circuit (SW) 52 provides a partial signal path of the mouse / joystick connection port 60 (here, the mouse clock signal (CLK ) And data (DATA) on the pins P4 and P5) are connected to the joystick (signal input terminal of the joystick controller (J-CNT) 33) and the mouse (keyboard controller (KB)).
C) 35 signal input terminals). Here, I
When the switching control signal of the bit b3 of the O register (IO-Reg) 51d is "1", the signal lines of the pins P4 and P5 are connected to the signal input terminal of the joystick controller (J-CNT) 33, and the joystick 70 Enable operation input. When the switching control signal of the bit b3 of the IO register (IO-Reg) 51d is "0",
4 、 P5 signal line to keyboard controller (KBC) 3
5 to enable operation input of the PS2 mouse 80.

As described above, by effectively using the unused pins of the mouse of the mouse / joystick connection port 60 which are not used, and assigning a part of the signal of the joystick to the unused pins, simple switch control enables One port can be commonly used for mouse and joystick.

Also, a single IO that was originally dedicated to a mouse
The joystick can be selectively used for the port under specific setting conditions such as setting of a sound function and setting of a specific application function. For example, when the "automatic recognition" mode is set from three modes of "automatic recognition", "fixed joystick", and "fixed mouse" by the setup, an external device connected to the mouse / joystick connection port 60 is automatically recognized and the mouse / joystick is set. The device connected to the connection port 60 can be input, and when the "joystick fixed" mode is set, various joysticks can be used without automatically recognizing the mouse / joystick connection port 60 as a dedicated joystick port.

In the processing procedure shown in FIG. 3, the setting contents of the "sound function" are determined, but this determination processing is not necessarily required. Alternatively, other function setting contents other than the “sound function” may be used.

Next, other embodiments of the present invention will be described with reference to FIGS. FIG. 6 is a logic circuit diagram showing an embodiment in which the automatic recognition processing in the above embodiment is realized by hardware. The same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

Here, the joystick connection detecting section 5
1, the output of the OR circuit (OR) 51c to which the detection signals (Dx, Dy) of the comparators 51a and 51b are supplied, and the setting contents of "automatic recognition" stored in the CMOS memory (Auto = "1") Is input to the AND circuit (A1).

The AND circuit (A1) is an OR circuit (OR) 5
The output of 1c is “1” indicating the connection state of the joystick 70 and “mouse / joystick port”
"1" is output when the setting content of "." Is the "automatic recognition" mode.

When the setting contents of "automatic recognition" (Auto) are inverted, the setting contents of "fixed joystick" (J /
When M = 1, the joystick fixed mode is input to the AND circuit (A2).

Thus, the AND circuit (A 2) outputs “1” when the setting content of “mouse / joystick port” is “joystick fixed” mode. The output of each of the AND circuits (A1, A2) passes through an OR circuit (O1) and is used as a switching control signal as a switching circuit (SW).
52.

By interposing such hardware in the joystick connection detection unit 51, the speed of the automatic recognition process can be increased. Further, the automatic recognition processing by the firmware shown in FIG. 3 can be avoided, the processing load on the CPU 11 can be reduced, and the control program can be simplified.

FIG. 7 shows the joystick connection detecting section 51 of the above embodiment, in which the connection presence / absence detecting means of the joystick 70 is replaced by a mouse / joystick connection port 60.
An example is shown in which this is realized by mechanically forming a specific circuit at the time of plug connection of a DIN 6-pin jack. Here, the shield ring C of the jack is electrically insulated and divided into two parts, one of which is grounded (GND) as in the conventional case, and the other is connected to the V by a pull-up resistor.
Pull up to cc level and use this as a joystick detection piece. On the other hand, a plug of the PS2 mouse 80 is provided with a shield ring D for short-circuiting the pieces C1 and C2, and a plug of the joystick 70 is provided with a shield ring E for short-circuiting the pieces C1 and C2. With this configuration, the presence or absence of the connection of the joystick 70 can be mechanically detected without using a circuit element such as a comparator.

[0070]

As described above in detail, according to the present invention, an IO port which was originally a connection port of a mouse (PS2 mouse) is used in combination as a joystick port, and an IO port common to the joystick and the mouse is used. Means for recognizing that a joystick is connected to a common connection port for a mouse and a joystick,
Means for enabling operation input of the joystick when recognizing that the joystick is connected by this means, recognizing an external device connected to the connection port in the initialization processing, Is configured to selectively receive the input unique to the device connected to the device.
A mouse or joystick can be selectively connected.

According to the present invention, a means for recognizing that a joystick is connected to a connection port common to a mouse and a joystick, and a specific means for recognizing that a joystick is connected by this means. Means for enabling the joystick operation input under the setting conditions, for example, when the sound function is set to "enabled" in the setup, the joystick operation input is enabled and set to "disabled". In some cases, a configuration that has a function that enables mouse operation input allows specific IO settings, such as sound function settings and specific application function settings, to be provided to a single IO port originally dedicated to the mouse. The joystick can be used selectively under certain conditions.

According to the present invention, a connection port common to a mouse and a joystick, means for setting a mode for automatically recognizing an external device connected to the connection port, and an automatic recognition mode are set by this means. Judge whether the external device connected to the connection port is a joystick or a mouse when connected, and when the joystick is connected, connect the input processing circuit of the joystick to the connection port and connect the mouse. Means for connecting the input processing circuit of the mouse to the connection port when the connection is made, for example, the "automatic recognition" mode is set from three modes of "automatic recognition", "fixed joystick", and "fixed mouse" by setup. Automatically recognizes an external device connected to the connection port and enables input of the device connected to the connection port. By the, when the "joystick fixed" mode is set, it is possible to enable various joystick regardless of automatic recognition of the connection port as a joystick-only port.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 shows a configuration of a joystick connection detection unit (JD) and a switching circuit (SW) in the embodiment, and a mouse / joystick connection port using a PS2 mouse connection port (DIN, 6-pin jack). FIG. 2 is a block diagram illustrating a circuit configuration.

FIG. 3 is an exemplary flowchart showing an external device recognition processing procedure executed in an initialization processing routine in the embodiment.

FIG. 4 is a view showing a setup (system setup) screen in the embodiment.

FIG. 5 is a diagram showing the contents of a switching control signal of a bit b3 of an IO register (IO-Reg) 51d in each mode of "automatic recognition", "fixed joystick", and "fixed mouse" in the embodiment.

FIG. 6 is a logic circuit diagram when an automatic recognition process is realized by hardware according to another embodiment of the present invention.

FIG. 7 is a diagram illustrating a joystick connection presence / absence detecting means in a joystick connection detection unit according to another embodiment of the present invention.
-The figure which shows an example at the time of realizing by the mechanical specific circuit formation at the time of plug connection of a 6-pin jack.

[Explanation of symbols]

10 system bus, 11 CPU, 12 main memory,
13: additional memory, 14: DMA controller, 15 ...
Interrupt controller, 16 timer, 17 real-time clock (RTC), 18 backup RAM,
19: Kanji ROM, 20: Dictionary ROM, 21: DOSR
OM, 22 application ROM, 23 PC card controller, 24 menu ROM, 25 system ROM, 31 FDD controller, 32 printer controller, 33 joystick controller (J-CNT), 34 sound controller, 35
Keyboard controller (KBC), 36 ... Display controller, 37 ... Image memory (VRAM), 38
... RS-232C controller, 39 ... TV controller (T-CNT), 41 ... Floppy disk drive (FDD), 42 ... Built-in keyboard, 43 ... Monochrome liquid crystal display (LCD), 44 ... Power supply controller, 51
... Joystick connection detector (JD), 51a, 51
b: comparator, 51c: OR circuit (OR), 51d
... IO register (IO-Reg), 52... Switching circuit (S
W), 53: TV connection detection unit, 60: mouse / joystick connection port, 70: joystick, 80 ...
PS2 mouse, A1, A2 ... AND circuit, O1 ... OR circuit, C, D ... Shield ring.

Continuation of the front page (56) References JP-A-5-233108 (JP, A) JP-A-5-94402 (JP, A) JP-A-2-304662 (JP, A) JP-A-61-229146 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 3/00 G06F 3/033 G06F 13/14

Claims (2)

(57) [Claims] 1. A mouse or a joystick is selectively provided.
Outside having a first pin group and a second pin group to be connected
A Department device connection port, among the plurality pins of the external device connection port, the first
First input processing that performs mouse input processing using pin groups
Circuit, and among the plurality of pins of the external device connection port, the first
Using the pin group and the second pin group,
A second input processing circuit for performing input processing of the input device, and a joystick among a plurality of pins of the external device connection port.
Voltage of the second group of pins used for input processing
Monitor the presence or absence of a joystick connection.
Joystick connection recognition circuit identified by the joystick connection recognition circuit, Joystick
If the connection of the
Input destination of the predetermined signal input to the first input processing circuit
Switch circuit for switching from the above to the second input processing circuit
And the joystick in the x direction using the second pin group.
And a scanning signal in the y direction.
Portable computer. 2. The joystick connection recognition circuit according to claim 2 ,
Of the second pin group, the joystick in the x direction
A first pin used for inputting a scanning signal and a scanning signal in the y-direction;
Monitors the voltage of the second pin used for signal input
The voltage of one of the first and second pins is a predetermined reference.
Recognizes joystick connection when voltage is higher
The port tab according to claim 1, wherein
Computer.