Found a psx hack (boot cd) that says it works without modchip.

[NooK]

The file has this txt:

"Smersh Console Division Presents the biggest breakthru on the PSX scene!

PSX-Boot CD: To use copied cd's with non-modded psx'es!

Some Kind Anonymous Person (I don't even know who it was) sent me a .ISO image
made with EZ CD Pro 2.1 for Windows 95 of the BootUp CD Used with the Yaroze!!
Then another kind anonymous person Cracked it for us! Get it here if you are
interested. Its about 800k zipped and 43 MEGS unzipped. Talk about compression!

For those of you who dont know shit, the yaroze is a playstation development
system, capable of running homemade cd's, first run this cd, then run your
homemade cd. Ofcouse the folks at playstation made a copy protection, so that
this CD could not run on any playstation without the special Yaroze ###card
(looks like a memory card), however this have been cracked

here's how to make this thing work:

1. Burn this image to a CD using Adaptec EZ CD Pro 2.1
2. Run this CD on your playstation
3. Insert and Play your copied cd's without needing a modded psx!
.. Repeat steps 2 and 3 each time you wish to play a copied CD."

Has anybody tried yet? Does it works without a modchip?