ISA—Stands for the Industrial Standard Architecture bus. ISA is an older type of local bus that is being completely replaced by PCI. Its bus is only 16 bits.
Motherboard—The Motherboard is the main circuitry of a computer. It is the base where every component's interact. The bus on a motherboard provides the route for components to communicate with the CPU and memory. On the surface of the board are chips for controlling peripheral devices and booting up the computer, and socket and slots for connecting CPU, RAM, and expansion cards. This is the second most important part in a computer.
Parallel port—A port
that connects other peripheral device which can either transfer single
or multiple bits of data at a time
PCI—Peripheral Component Interconnect. PCI is a local bus with a channel of 32 – 64 bits wide and the clock speed of 33 or 66 MHz.
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