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I thought this was quite interesting(read this on a Japanese game site):
The PS2 hardware, in Japan, has gone through a history of fixes and updates, as you can see below. Translated by me, OOSACKER .
(1)The first version, SCPH-10000 had MANY issues regarding DVD playback and memory card use. Such as:
-Memory being erased or broken in memory card.
-The disk tray had problems opening and closing.
-DVD player 1.0 was not region locked.
-The optical out was dodgy.
-The memory card connection was dodgy.
-When playing a DVD, using a specific machine allowed copying.
The machine came with a memory card.
(2)Version 2. SCPH-15000 had a fixed DVD player. And some swapped parts to increase manufacturing productivity.
(3)Version 3. SCPH-18000
-The DVD player was put into the ROM inside the machine instead of the memory card.
-The Memory card was not included in the package anymore. But the remote was included instead.
-The DVD playback did not work in RGB anymore.
(4)Version 4. SCPH-30000.
-The expansion bay was changed to accomodate broadband, and HDD.
-The CPU manufacturing process was changed to 18micron from 25. Reduced heat production.
-Fan was made more powerful and noisier.
(5)Version 4a. SCPH-35000 GT.
Came in a red box with GT3 ASpec . Virtually indentical to the one above.
(6)Version 4.5. SCPH-37000L.
Limited Edition model in transparent Ocean Blue colour. The power rating was changed from 47w to 39w.
(7)Version 4b. SCPH-37000B.
Special limited edition model which came in Zen Black colouring.
Vertical stand and remote was standard in the package.
(8)Version 5(?). SCPH-39000.
Looked exactly the same except the manufacturing cost was cheaper, and fought for people's money during the Christmas period.
(9)Version 6. SCPH-50000.
-Support for DVD+-R/DVD-R formats.
-DVD progressive mode support.
-25% quieter operation.
-Added an IR receiver to the front, receiver not needed to stick into the controller port.
-iLINK port disappeared.
-New remote control came out with ON/OFF button.
My PS2 is a SCPH-30002 PAL, which I think is a 4th gen PS2.
The PS2 hardware, in Japan, has gone through a history of fixes and updates, as you can see below. Translated by me, OOSACKER .
(1)The first version, SCPH-10000 had MANY issues regarding DVD playback and memory card use. Such as:
-Memory being erased or broken in memory card.
-The disk tray had problems opening and closing.
-DVD player 1.0 was not region locked.
-The optical out was dodgy.
-The memory card connection was dodgy.
-When playing a DVD, using a specific machine allowed copying.
The machine came with a memory card.
(2)Version 2. SCPH-15000 had a fixed DVD player. And some swapped parts to increase manufacturing productivity.
(3)Version 3. SCPH-18000
-The DVD player was put into the ROM inside the machine instead of the memory card.
-The Memory card was not included in the package anymore. But the remote was included instead.
-The DVD playback did not work in RGB anymore.
(4)Version 4. SCPH-30000.
-The expansion bay was changed to accomodate broadband, and HDD.
-The CPU manufacturing process was changed to 18micron from 25. Reduced heat production.
-Fan was made more powerful and noisier.
(5)Version 4a. SCPH-35000 GT.
Came in a red box with GT3 ASpec . Virtually indentical to the one above.
(6)Version 4.5. SCPH-37000L.
Limited Edition model in transparent Ocean Blue colour. The power rating was changed from 47w to 39w.
(7)Version 4b. SCPH-37000B.
Special limited edition model which came in Zen Black colouring.
Vertical stand and remote was standard in the package.
(8)Version 5(?). SCPH-39000.
Looked exactly the same except the manufacturing cost was cheaper, and fought for people's money during the Christmas period.
(9)Version 6. SCPH-50000.
-Support for DVD+-R/DVD-R formats.
-DVD progressive mode support.
-25% quieter operation.
-Added an IR receiver to the front, receiver not needed to stick into the controller port.
-iLINK port disappeared.
-New remote control came out with ON/OFF button.
My PS2 is a SCPH-30002 PAL, which I think is a 4th gen PS2.