don't press the red button

Today I learnt about four different types of printer and how they work. The printers I learnt about are, inkjet printers, dot matrix printers and laser printers. The lasrer printer is is the fastest out of the three.

PPM stands for (Pages Per Minute) this means the number of pages the printer prints per minute.

A laser printer uses electro photographic technology, laser printer are commonly used in offices because they can print very fast, in fact a laser printer prints 8-200 (PPM). They would need this in a office so that they can print their work off quick.
laser printers used four colours they are:
Cyan
Magenta
Yellow
Black

A Inkjet Printer uses electrostactic spray technology, Inkjet Printers are mostley used in a house. Inkjet Printers can print at 2-6 ppm, when it is using full colour it prints at 2ppm and when it printing black and white it prints at 6 ppm. Most inkjet printers use aqueous ink base on a mixture of water, glycol and dyes or pigments. The colurs that inkjets use are:
Cyan
Magenta
Yellow
Black
These colours are the same as the laser printers colours.

A dot matrix printer prints with a print head that run back and forward, when doing this it smashes and pounds a ribbon onto the page this is how it prints.
In 1975 dot matrix first came out they were usally found in offices or i you have a lot of money you mit of had one. The down side for these printers is that they print very slowly and this would be a little bad in a office.
Dot Matrix printers use black ink, but they can use blue ink.

One of the original laptops was the GRiD Compass 1101. It was used by astronauts on space missions in the early 1980s. It weighed 11 lb (5 kg) and cost US $8,000 – $10,000!!!! Laptops today often weigh less than one-half the weight and cost less than one-third the price of the GRiD.
The first laptops were used primarily for business people who needed to access and enter data when they were away from the office. The use of laptops was limited due to expense, weight, and limited capabilities compared to less expensive desktops.

Laptops were heavy and expensive then but today, laptops are very popular because advances in technology have resulted in laptops that cost less, weigh less, A laptop is now a real alternative to a desktop computer. They improved capabilities and can do more than just run a simple word doc.

Some common laptop features!  

Laptops have a shape motherboard to fit the case.
They have an integrated display screen in the lid.
They have an integrated keyboard in the base.
They run on AC power or a rechargeable battery.
They support hot-swappable drives and peripherals.

Most laptops can use docking stations and port replicators to connect peripherals.
Desktop motherboards have standard form factors. The standard size and shape allow motherboards from different manufacturers to be interchangeable. Desktop motherboards have standard form factors. The standard size and shape allow motherboards from different manufacturers to be interchangeable.

Laptop motherboards vary by manufacturer and are proprietary. When you repair a laptop, it is strongly recommended that you obtain a replacement motherboard from the manufacturer of the laptop.

Laptop motherboards and desktop motherboards are designed differently.
Desktop motherboards have standard form factors.

Laptop motherboards and desktop motherboards are designed differently. Laptop motherboards are made to fit the case, Components designed for a laptop generally cannot be used in a desktop computer motherboards are standardise.

PDAs and Smart phones are portable, hand-held devices that are becoming more popular every day. PDAs offer features such as games, web surfing, e-mail, instant messaging, and many other features offered by PCs but it is hard to use a word doc on PDA’s. Smart phones are cell phones with many built-in PDA capabilities, smart phones cannot use word doc’s. PDAs and Smart phones can run some of the same software as laptops and desktops.

The PDA has existed since the 1970’s one of the earliest models were computerized personal organizers designed to have a touch screen or a keyboard. Today, some models have both a touch screen and a keyboard and use an operating system that is similar to operating

systems used on desktop computers. The Smartphone is a mobile phone with PDA capabilities.

PDA includes:
Address book
Calculator
Alarm clock
Internet access
E-mail
Global positioning

Smart phone includes:
Built-in camera
Document access
E-mail
Abbreviated note-taking
Television

Docking stations

There are two types of base stations: docking stations and port replicators. Docking stations and port replicators are used for the same purpose. Port replicators are usually smaller than docking stations and do not have speakers or PCI slots. The back of the docking station contains ports and connectors used to attach devices such as a mouse, a monitor, or a printer. A vent is also necessary to expel hot air from the docking station.

Docking station have a locking devices in the to make it harder for someone to steal it you need a key for this.

Docking stations include the following drive bays and ports to provide additional functionality:

Parallel
USB
Ethernet
Video
Audio

The Central Processing Unit , or processor, is the brain of the computer. The CPU interprets and processes instructions that are used to manipulate data.

Laptop processors are designed to use less power and create less heat than desktop processors. As a result, laptop processors do not require cooling devices that are as large as those found in desktops. Laptop processors also use CPU throttling to modify the clock speed as needed to reduce power consumption and heat. This results in a slight decrease in performance. It also increases the lifespan of some components. These specially designed processors allow laptops to operate for a longer period of time when using a battery power source.

Technicians should refer to the laptop manual for processors that can be used as replacement processors and for processor replacement instructions.

Desktops are usually set up on a desk or a table where they remain plugged into a power source. Desktop power management distributes electricity from the source to the components of the desktop. There is also a small battery in the desktop that provides electricity to maintain the internal clock and BIOS settings when the desktop is powered off.

Laptops are small and portable. This portability feature is achieved by combining the small size and weight of a laptop with the ability to operate from a battery. When the laptop is plugged in, laptop power management sends electricity from the AC power source to the laptop components. The laptop power management also recharges the battery. When the laptop is unplugged, laptop power management takes electricity from the battery and sends it to the laptop components.

BIOS-basic input output system
BIOS was used to control the settings for power management.

AMP- Advanced Power Management
APM is an earlier version of power management

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G-1 the first generation of wireless telephone technology, mobile telecommunications (G-1) of cell phones began service in the 80s. They mostly used analog standards, including AMPS (Advanced Mobile Phone System and NMT (Nordic Mobile Telephone).

The connection on these phone was so bad that if was on the phone and someone walk past you, you would louse connection, and if you  walk while you was on this phone you would louse connection and not be able to get it back again.

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