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The device number connected on a Commodore 64 system relates to the number of controls connected. This determines how many players can interact with games simultaneously.
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On a typical setup, only one device can be connected to the ports. However, if you have a special USB port, or a device that will split a USB port, you can connect 2 or more devices.
Yes, most computer networks consist of many computers that are usually connected by a networking device such as a hub, switch or access point. This type of a network is called a LAN.
USB is a kind of communication port. Many portable devices have this port and can be connected this way to other devices.
A device which connects to the computer is called a "peripheral."
A battery is a device that stores energy through chemical reactions. When connected to a circuit, the stored energy can be discharged as electrical power to operate a device.
That completely depends on how much current is used by the circuit or device that's connected to the battery. For example, if there is no circuit or device connected to the battery, and no current is used, then the battery lasts for quite a long time. But if you lay a screwdriver across the battery terminals and create great balls of fire, then the charge on the battery may only last for 1/2 second.
A device containing a cord connected to as many as six electrical outlets controled by a switch. Also known as a power bar or