Electronic device system, electronic device, and storage medium

An electronic device system comprising:

• a storage medium storing a program and outputting the program from a first pin;
• and
• an electronic device to which the storage medium is detachably connected so as to read the program from the storage medium and execute processing by the program, wherein
• the storage medium is provided with:
• a response unit that outputs a response signal in response to a connection check signal outputted from the electronic device;
• and
• a second pin to which the connection check signal is inputted and outputting the response signal outputted by the response unit, and
• the electronic device is provided with:
• an input-output unit that outputs the connection check signal to the second pin and obtains the response signal from the second pin;
• a determination unit that determines whether the storage medium is connected or not based on the response signal obtained by the input-output unit;
• and
• a processing unit that executes processing by the program when the determination unit determines that the storage medium is connected.