Abstract: The camera system comprises a camera and an external device. The camera includes a microcomputer, a write control circuit for receiving replacement data from the external device and writing the replacement data into a replacement program memory of the microcomputer, and an interface circuit for controlling a camera element in accordance with the decoded value output from an instruction decoder (ID) of the microcomputer. The external device includes a memory for storing address data to be changed in the microcomputer in the camera and replacement program data, and a transmission circuit for reading out the replacement data from the memory and transmitting the read-out data to the camera.

Abstract: A one-chip microcomputer system includes a one-chip microcomputer, a nonvolatile memory which can electrically rewritably store changing data of a program stored in a mask ROM of the one-chip microcomputer, an input unit (connection unit) for receiving data to be written in the nonvolatile memory from an external device, and an object to be controlled by the one-chip microcomputer. In one aspect, the nonvolatile memory has first and second correction data areas, and first and second memories for respectively designating these areas. Upon reception of an initialization signal from the external device connected to the input unit, only the second memory for designating the second correction data area is initialized. In another aspect, the mask ROM stores ROM version data, and the nonvolatile memory stores board version data.

Abstract: A cavity insert device comprising an insert section capable of being inserted into tracts and cavities, a detection circuit for detecting conditions of components making up the device, such as an observation device formed at the distal end side of the insert section, and a fuzzy inference section for synthetically determining a plurality of information signals outputted from the detection circuit and producing control signals to control the components. The fuzzy inference section employs inference rules which are empirically considered to be desirable, and control is made by the control signals obtained with the fuzzy inference. The device is thus operated in a nearly optimum state.