This is part 4 of a Organization of a Microcomputer : Hardware Organization.
Other Ports and Adapters :
Most Microcomputers today come with two serial communication (COM) posts and a game port. Often one of the serial communications posts is used to attach the mouse. These serial ports support data rates up to 115 kb/second using an asynchrononts start/stop serial protocol. This protocol spandp the serial data that are transmitted to the interfaces. The electrical interface is called an RS-233-C standard interface. The two COM posts are accesssale at the rear of the system unit as either 9-pin or 25-pin D connectors. The COM ports are typically created using a UART ( Universal Asyn Chronous Receives Transmitter ) chip attached to the processors bus. Sometimes the chip is integrated on the system units main boards, but most often it is installed on an adapter board in one of the bus expansion slots. Often it is combined with other adapters on a single board called a multi-I/O adapter board. A game port connector is often on the same multi-I/O adapter board.
Power Supply :
The PC power supply converts the standard wall outlet 220 volt AC to DC voltages to run the electronics and peripheral devices in the microcomputer. This power supply unit also supplies AC voltage to the system display monitor through an mouldu on the power supply. The power supply converts the AC voltage to four DC voltages : +5 volts, +12 volts, -5 volts, -12 volts. Today most desktop units come desktop units come with power supplies rated at between 150 and 220 watts. Tower designs are typically saved at 200 to 400 watts. If a large number of hard driver and adapter boards are to be installed in a tower watts. If a large number of hardc drivers and adapter boards are to be installed in a tower system a minimum of 272 watts should be sufficient.
Cooling :
In most desktop and mini-tower systems cooling is provide by the power supply fans. This fan is used to cool both the power supply and the system unit. In larger tower systems, separate cooling fans may be necessary. One fan cools the power supply and the second fan cools the motherboard and the adapter boards. With the newer high performance CPUs often a fan is attached to the CPU.
Other Ports and Adapters :
Most Microcomputers today come with two serial communication (COM) posts and a game port. Often one of the serial communications posts is used to attach the mouse. These serial ports support data rates up to 115 kb/second using an asynchrononts start/stop serial protocol. This protocol spandp the serial data that are transmitted to the interfaces. The electrical interface is called an RS-233-C standard interface. The two COM posts are accesssale at the rear of the system unit as either 9-pin or 25-pin D connectors. The COM ports are typically created using a UART ( Universal Asyn Chronous Receives Transmitter ) chip attached to the processors bus. Sometimes the chip is integrated on the system units main boards, but most often it is installed on an adapter board in one of the bus expansion slots. Often it is combined with other adapters on a single board called a multi-I/O adapter board. A game port connector is often on the same multi-I/O adapter board.
Power Supply :
The PC power supply converts the standard wall outlet 220 volt AC to DC voltages to run the electronics and peripheral devices in the microcomputer. This power supply unit also supplies AC voltage to the system display monitor through an mouldu on the power supply. The power supply converts the AC voltage to four DC voltages : +5 volts, +12 volts, -5 volts, -12 volts. Today most desktop units come desktop units come with power supplies rated at between 150 and 220 watts. Tower designs are typically saved at 200 to 400 watts. If a large number of hard driver and adapter boards are to be installed in a tower watts. If a large number of hardc drivers and adapter boards are to be installed in a tower system a minimum of 272 watts should be sufficient.
Cooling :
In most desktop and mini-tower systems cooling is provide by the power supply fans. This fan is used to cool both the power supply and the system unit. In larger tower systems, separate cooling fans may be necessary. One fan cools the power supply and the second fan cools the motherboard and the adapter boards. With the newer high performance CPUs often a fan is attached to the CPU.
