Timeline
The handheld gaming console didn't come around till 1970s these devices were called tabletop electronic game device which came out in 1972 they are also known as a non video electronic game. One of these tabletop games is the waco's electronic tic tac toe.
In 1976 Michael Katz a marketing director told hos engineers to make a calculator sized sports game which came to be known as autorace where you race on the device itself. A football version came out soon after.
In 1979 the Milton Bradley Company invented the Microvision which is another gaming device that plays multiple games the first game to come out was a game called block buster where you bounce a pixel which is a ball and you have to break other puxels which represent bricks. 
In 1982 Bandai came to the portable gaming hype by introducing the Bandia LCD solarpower the game that is most mentioned for this portable console is Terror House which is a horror 2D game.
In 1989 and 1990 in the UK the Gameboy Original was made and became poplular as it sold over 1 million copies roughly at the end of the yeat of it's release.
In 1990 for Japan and 1991 in europe the Saga gamegear was released his saga hand held and it was made to be a portable version of the saga Overdrive as you can see from the game being played on the saga handheld.
In 1995 the saga nomad is a more updated version of the saga game gear such as it can play all of the saga games regardless of region and it was believed to have touch screen until the devolopers realised it would cost over £250 when being sold on the shelves so the idea was scrapped.
In 1998 the Game boy Colour came out which means it took 8 years for Nintendo to upgrade from the original to the colour. As the name says this new version of the gameboy has colour unlike the original which is a low poly black and white version.
In 2001 the Gameboy Advance was released which is 3 years after the colour came out. The gameboy advance is a little more advanced then colour when it comes to the battery power but unlike the colour the advance hasn't cot a LED connection to connect to online players for games such as pokemon etc.
In 2002 the N-gage is both considered a Mobile Phone and a gaming device which is made by Nokia Phone company. This console/Phone was the first combanation.
In 2004 the Nintedo DS was released with a new range of touchscreen along with the two screen displays to operate with but the bottom screen is touchscreen only. The cartridge is a little different to the gameboys type and can't support thier cartridges as it will not fit or even work.
In 2005 the first Playstation Portable was released as the very first Portable gaming for the Playstation as it is a more improved version as the PS2 but it has even worse graphics then the PS2 and uses it's own type of gaming cartridge but as a disk inside of a case this type of cartridge is called a UMD (Universal Media Disk).
The Psp GO is the second version of Playsyation Portable as it is a new look to the psp and doesn't support UMDs but only runs on internal memory which means you need to buy the games of the Playstation store. The GO was discontinued early on after it's release because they wanted to concentrate more on there new Handheld so the product was dicontinued in both europe and japan and only available in america.
The Nintendo 3DS was released on Febuary 2011 and became a new generation of handheld gaming as it is the first handheld to support the 3D visual which would only be for Cinema (filming). The Nintendo is designed exactly like the original DS as it uses the same type of DS Cartridges so it supports original DS games and uses a stylus for the touchscreen. Even now the 3DS is at the top of the list when handhelds are concerened.
The Playstation Vita was released in Febuary 22nd 2012 and it the top range of the playstation portable versions. The vista like the 3DS supports touchscreen and a front and back camera. This handheld has two analog sticks which is new to the handheld franchise which makes it easier for certain types of games. It also a very good tool for internet use as it can support either 3G or wifi depending on your buy. The touchscreen unlike the 3DS is very different as you can touch the back of the handheld and the front of the screen and it effects what goes on in the game. The problem with Vita is that at the beginning it did not support PS2 or PS1 as they are not compatable and you can not play PSP UMDs as it is also not compatable as vita has it's own type of UMD but can be bought and played via the playstation Store. Playstation Timeline
The Sony computer entertainment company created the Playstation console series From Play Station 1 to 3 along with the portable version of PSP (Playstation Portable) and PSP Vita.
1994 is the year that the first playstation was released to the public all over the world which made a huge impact as it was played with disks and not cartridges and the graphics was more improved then that of nintendo and and saga. The Playstation 1 had over 100 million units which was sold all over the world in over 9 years, it is also noted that the playstation 1 is easily chipped by removing only the spring inside of the disk holder. The Playstation 1 slim was created in the year 2000 which was a different look from the original, it had a different start up menu, a better protection from being chipped and a lack of parallel and serial ports.
The Playstation 2 was released all over the world in the year of 2000 which is a bigger and fatter version of the Playstation 1 and in the colour of black instead of grey. The playstation 2 plays DVD films and music CDs, it also plays better graphic resolution games unlike it's predecessor which are DVD ROM disks. Just like the Playstation 1 the playstation 2 also has a slim version which is said to be a lot faster in memory than the original which was released in 2004. The slim even though it is a smaller, thiner and a quieter version to it's original it overheats within a few hours of use as the fan inside is too small and not as powerful as the original PS2.
The Playstation Portable was released the same year as the Playstation 2 slim in 2004 and is the first Portable gaming console to be made for the playstation. The PSP is the first Portable gaming to have games being played by a small disk called a Universal Media Disk (UMD for short) instead of a cartridge and it is modeled to look like the Playstation 3 as you can see the home screen. Over the years that the original was made they started to make more versions of the PSP such as the slim 2000 and 3000 which are exactly the same but the 2000 is a slimmer and light version and the 3000 has a built in microphone for certain games that require it.
In 2009 the PSP GO was released but unlike its predecessors' the Go doesn't have a UMD drive. To buy games you have to purchase them online in the playstation store. To keep up with people buying games and storing the game data on the GO they improved on the memory cards and internal memories to store and hold so much memory such as 16 gig of flash memory and has a max memory of 32 Gig.
In 2012 the PSP Vita was released and is on Par with the 3DS max as this is the first playstation touchscreen. The Vita is the latest of PSP series and supports a new kind of UMDs and can't support the old ones but can still play old PSP games but via the playstation store. The vita has better graphics then its predecessors and improves on the graphics of the old games and has new and better functions such has two duel sticks, it has better internet capacity as it is compatable with 3G Motion sensor just like that of the playstation 3, able to combine with your PS3 such as if you pause the game on your ps3 you can carry on on your Vita and also play against players on the PS3, it has a front and rear camera for a simulated fighting as a perfect avatar of yourself fights another avatar of someone else. The only bad quality as of yet for Vita is that if yuo buy the 3G bundle then everytime you use an online feature such as checking the leaderboards or playing a game online and even using the GPS will cost you money because you are using the signal which 3G uses the radio wave signal that transmits to phones. 
The Playstation 3 is the the second to last of Playstation consoles and the most formiddable as of yet as the console is built for lots of things such as music, movies, gaming and most of all online chatting. The gaming side is more advanced then the playstation 1, 2 and portable as the ram and graphic memory is that of a gaming computer. The PS3 has made 2 types of slims such as the first playstatopn slim seen on the right of the original ps3 and the new PS3 slim which has just come out this year. The both slim was made with twice as much memory as the original and far smaller then the original. They also improved on the RAM and internal memory to access the internet better. 
The playstation 4 is soon to come out in winter 2013 and is the latest in all the playstation series of consoles and hardware. The Playstation 4 has taken a massive leap just like the xbox to be something closer to that of a PC as games are now stored on the cloud storage even though they both have 500gb of HDD. What the cloud storage means is that it is more skype based as you can talk to friends whilst playing your PS4 game and even record your game and edit the footage to be uploaded onto youtube or anywhere on the internet. The PSV or PS Vita is very well connected to the PS4 as the PSV is more adept to the better graphical games and the PS4 was centered around the PSV aswell. 
