Abstract: A voltage-controlled current source includes an FET mirror connection circuit in which a gate and a drain of a first FET are connected to each other and a gate of a second FET is commonly connected to a connection point between the gate and the drain of the first FET; a third FET which has a source load and which is source-follower connected; a fourth FET of which a gate and a source are directly connected to each other and a connection point between the gate and the drain is connected to a source of the third FET to become the source load; and a fifth FET for inverting a voltage of which a gate is connected to a source of the third FET and a drain is connected to the common connection point of the FET mirror connection circuit. In the voltage-controlled current source, a control voltage is applied to the gate of the third FET, and an output current corresponding to the control voltage is derived from the drain of the second FET.

Abstract: A variable gain amplifier contains first and second amplifying elements for signal amplification, which are differentially connected to a first constant current source. Third and fourth amplifying elements for gain control are differentially connected to a signal input terminal connected to a second constant current source. Fifth and sixth amplifying elements for gain control are differentially connected to a signal input terminal connected to a third constant current source. In addition, an output terminal of the first amplifying element is connected to the second constant current source and an output terminal of the second amplifying element is connected to the third constant current source. The first constant current source is connected to a high potential terminal of a power source and the second and third constant current sources are connected to a low potential terminal of the power source.

Abstract: An information processing device such as a game machine is selectively connectable to different peripheral devices such as memory devices. The peripheral devices may be provided with characteristics for distinguishing one from another. The information processing device carries out operations based on the peripheral device connected thereto The information processing device may also access memories which store data having different data widths.

Abstract: A linear array of red LEDs 10R is provided so as to extend in a direction substantially perpendicular to a direction in which a swing-type display device is swung, and a linear array of green LEDs 10G is further provided, the red LEDs 10R and green LEDs 10G being arranged in pairs of two. A CPU activates each of the red LEDs 10R and green LEDs 10G for a predetermined period to emit light in a luminance level in accordance with image data. As a result, an image corresponding to the image data is displayed in the trajectory of the swing due to persistence of vision. Thus, an image can be displayed in various colors.

Abstract: An information processing device such as a game machine is selectively connectable to different peripheral devices such as memory devices. These peripheral devices may be provided with characteristics for distinguishing one from another. The information processing device carries out operations based on the peripheral device connected thereto.

Abstract: A game cartridge is provided for use with a portable game machine having a processing system to execute a video game program and player controls operable by a player to generate video game control signals. The game cartridge includes a housing, a game memory for storing a video game program executable by the processing system, and electrical contacts that, in use, electrically connect the game cartridge to the processing system. The game cartridge also includes a vibration source for vibrating the housing and a driving circuit responsive to instructions from the processing system for controlling the vibration source.

Abstract: In an information processing device 30 having engaged in a detachable manner with, for processing, via an external bus 37, 47 in a second data width, a first game cartridge 20 housing first memory 22 in a first data width, or a second game cartridge 40 being partially different in shape from the first game cartridge 20 and housing second memory 42 in the second data width, a shape discriminator 35 discriminates between the first and second game cartridges 20, 40, and a central processing unit accesses the second memory 42 in a multiplex bus mode and the first memory 22 in a normal mode.

Abstract: In a portable game machine 10, formed on the upper portion of a body portion 20 is a camera portion 30. An image display device 22 is arranged on one main surpace of the body portion 20, and operating switches 23, 24, etc., are arranged on other areas. The camera portion 30 is rotatably supported to the body portion 20, and a user can shoot images in both forward and backward directions when viewed from the user. Preferably, the camera portion 30 is supported having a prescribed angle to the body portion 20 so that its focal axis tilts with respect to main surfaces of the body portion 20.

Abstract: A connector includes a housing, and a flange portion which is formed by extending one main surface of the housing in a direction that a first circuit board is inserted. An adapter includes a casing having an insertion port into which a cartridge for first game machine can be inserted, and having a shape capable of being inserted into an insertion port of a second game machine. An adapter circuit board is contained in the casing, and includes a data conversion circuit which converts first game machine data stored in the cartridge for first game machine into data capable of being utilized in the second game machine.

Abstract: Scratches on the recording disk caused by sliding of a disk cartridge shutter is prevented by slidably inserting first and second shutters between a tray and a case on the opposite side to a recording disk accommodating portion of the tray. The first shutter simultaneously opens and closes a case side driving shaft insert hole, a case side head insert hole, a tray side driving shaft insert hole, and a tray side head insert hole. The second shutter opens and closes a terminal hole. The second shutter is opened independently of the first shutter and is held in a position so that the case side driving shaft insert hole, the case side head insert hole, the tray side driving shaft insert hole, and the tray side head insert hole are not closed. Closing the first shutter, however, causes the second shutter to also close.