What PSP Do I Have? The difference between old psp 1000, psp 2000, psp slim, psp 3000. PSP 3000 photos, pics.
Sony completely overhauled the PSP a few times, there is a big
difference. The
newer PSP's are thinner, lighter and have a few new
features.

The oldest PSP is sometimes referred to as "Thick" or "Fat". The
newer PSP is also known as "Slim", "Lite" or "PSP 2000".
The very latest is known as the PSP 3000. As of October, 2008, it has
yet to be released.
The PSP 3000 is said to be water-tight, it will float,
it's sealed with a rubber O-ring. It is said to be crush-proof also,  you
can run it over with your car if you're into that kind of thing
.
What Model PSP Do I Have?
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More Info On The PSP 2000 Slim
The PSP Slim & Lite offers a 33% lighter and 19% thinner system. Internal
changes to achieve this include the removal of a metal chassis (used to
reduce damage in the event of sudden trauma to the system resulting from
the user dropping the system on a hard surface), improved WLAN modules
and Micro-controller, and a thinner and much lighter LCD display.

Although dubbed "PSP Slim and Lite", the PSP-2000 offers several other
tweaks and improvements from the older generation. To target the original
PSP generation's poor load times for UMD games, the internal memory (RAM
and FlashROM) was doubled to 64 MB to improve load times and
accommodate for an improvement in the web browser's performance.

To make the PSP slimmer, the capacity of the battery was reduced by about
1/3. Due to more efficient power usage, the runtime of the PSP is still the same
as the older model. Older model batteries will still work with the PSP Slim &
Lite which extends the amount of playing time on the PSP Slim & Lite.
However, the battery cover on the newer model does not fit over the older
battery due to its bulkier size. However, you can get a battery cover for the
slim that allows the fat battery to be used. They are available at Power Gaming
Parts .Com or Game Repair Parts .Com.

The PSP Slim & Lite has a new enamel coated finish to prevent scratches and
smudges. The serial port was also modified in order to accommodate a new
video-out feature (while rendering older PSP remote controls incompatible).
Also of note is that PSP games will only output to external monitors or TVs in
progressive scan mode, so televisions incapable of supporting progressive
scan will not display PSP games. Other PSP video features output fine in
either progressive or interlaced mode.  The PSP will only charge while it is in
"USB mode". You cannot charge via USB when playing a game. However,
there are unoffical USB charge plugin downloads for charging the PSP with a
USB without the need for being in USB mode. The D-Pad was raised in
response to complaints of poor performance, while buttons offer improved
responsiveness, confirmed in the GameSpot "hands-on" review: "several
GameSpot editors have noticed that the d-pad and buttons on the new PSP
provide a little more tactile feedback for a better overall feel.".

A new UMD loading tray design was introduced to be more efficient in terms
of size, while the Wi-Fi switch was moved to the top of the console and the
Memory Stick slot moved to the upper left. The speakers were repositioned
on the front of the PSP near the top of the screen. The rather obsoleted
infra-red port was also removed - which offered no use to the original PSP
generation other than in homebrew applications. The analog stick was also
redesigned to be more flexible.
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here is the difference between old psp 1000, psp 2000, psp slim, new psp 3000