[Nite]

Hah, gotcha! You tought this was a "where do I download blahblah."
but, the question is, HOW do I get the bios rom from the PSX (the grey box, you know to computer? It's kinda new machine and it doesn't have the paraller port at the back, so no gamesharks or the like.
(the code at the bottom is SCPH-9002) and it's the grey thingy, not PSOne.

 

[Prafull]

From adripsx faq.

To dump a PlayStation BIOS, you need a GameShark or Action replay and a PC comms link. To start, you need either a real Caetla module or go to altavista and search for "Caetla" (it's a BIOS replacement for your module, so properly read the included documentation before installing it!!). Now upload "Caetla", and use use the caetla commands for downloading a binary memory image from the region 0x0bfc00000 - 0x0bfc7ffff! Now save the image as SCPHxxxx.bin, where xxxx is your PSX's model number, and AdriPSX will recognise it and use it from now on.

I hope it helps.

 

[Bgnome]

that wont work because he has a 900x model. those do not have a serial port installed. so unfortunately, you must install one manually by getting the part online somewhere.