September 8th, 2016.
Due to my absence in blogging I would firstly wish to apologize for procrastinating this awfully. Without further ado, let's begin the second half of chapter 4, System Unit Components.
ROM
Read-only memory, or in other words also know as ROM, refers to memory chips storing permanent data and instructions. Examples may include a firmware.
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Furthermore, A programmable read-only memory, otherwise known as PROM, is a blank ROM chip that can be written to permanently.
There are also such thing as electrically erasable programmable read-only memory, also known as EEPROM. Memories as such can be erased easily.
CMOS technology provides high speeds and consumes little power.
Access Time
Access time is the amount of time it takes the processor to read from the memory. It is also measured in nanoseconds.
Expansion Slots and Adapter Cards
An expansion slot is a socket on the motherboard that can hold an adapter card
An adapter card on the other hand enhances functions of a component of the system unit and/or provides connections to peripherals.
With Plug and Play, the computer automatically can configure adapter cards and other peripherals as you install them.
Removable flash memory may include memory cards, USB flash drives, and PC Cards/ExpressCard modules.
Ports and Connectors
A port, sometimes also referred to as a jack, is at which a peripheral attaches to or communicates with a system unit. A connector is what joins a cable to a port.
On a notebook computer, the ports are on the back, front, and/or sides.
A USB port can connect up to 127 different peripherals together with a single connector. It is also able to attach multiple peripherals using a single USB port with a USB hub.
Other types of ports also include:
- Firewire port
- Bluetooth port
- SCSI port
- eSATA port
- IrDA port
- Serial port
- MIDI port
A Bluetooth wireless port adapter converts a USB port into a Bluetooth port whereas a smart phone might communicate with a notebook computer using IrDA port.
A port replicator is an eternal device that provides connections to peripherals through ports built into the device.
A docking station is an external device that attaches to a mobile computer or device.
Buses
A bus allows the various devices both inside and attached to the system unit to communicate with each other. Examples are data bus and address bus.
Word size is the number of bits the processor can interpret and execute at a given time.
Expansion slots are connected to expansion buses. Common types of expansion buses include PCI bus, PCI Express bus, Accelerated Graphics Port, USB Firewire bus, and PC card bus.
Bays
A bay is an opening inside the system unit in which you can install additional equipment.
Power Supply
The power supply converts the wall outlet AC power into DC power.
Some external peripherals have an AC adapter, which is an external power supply.
Keeping Your Computer or Mobile Device Clean
Keeping your computer clean is essential and every computer owner just know the basics of cleaning it. Failing to do so will harm you computer. Here are some tips while cleaning your computer.
Clean your computer or mobile device once or twice a year.
Turn off and unplug your computer or mobile device before cleaning it.
Use compressed air to blow away dust.
Use an antistatic wipe to clean the exterior of the case and a cleaning solution and soft cloth to clean the screen.
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