For many months now there are
several experts on our forum discussing the possibility to create Playstation backups without
needing a Mod-chip to play them. Thousands of people have read the original thread with over 25 pages, and now the creators and
most active people have created a summary of all their
discoveries.
Discoveries indeed, many myths and wrong ideas have been
discussed, tried and proven to be not working. Also theories are developed on
what is possible to beat this old but still uncopyable copy protection. Much has
been learnt by sharing information and they are still looking for input from
other experts. Some things seem to be certain and the experts are already able
to explain what happens during the boot process.
track(s) of a pressed CD consist of an as good as straigth spiral, beginning in the inner circle and continuing 'til the outside edge. The factor "almost straight" is very important. Because the laser-unit has some tracking coils, which purpose is to keep the laser-beam, or better reflection of the beam!, as good as centered even if the CD spins at a very high speed, so the beam doesnt loose the trail while reading the track. The PSXs tracking coils took some advantage of this tecnic, and they have a special output for "tracking errors". Because at the pressing state of the PSX CDs, the Lead-In gets a very little, but still recognisable modulation (near as it was in earlier time on vinyl records). That modulation constists of long or shorter tracks of 22khz wobble pulses, the shortes distance we found out is ca. the lengt of: 1/3 to 1/4 CD sector. The signals consist of the SCEE, SCEA, or SCEI characters in old RS232 transmission code, which is already completly decoded and no big secret. The modchip simply injects that SCEx characters into the needed wire at the needed time and so the PSX BIOS and CPU 'thinks', the CD-controller sends over the correct signal and starts the boot code sequence. |
If you have no clue what they are talking about,
then you have a lot to learn, you should start by reading the entire summary.
Also be sure to read everything before you start posting suggestions and
questions, many have already been asked and suggested. If you have the feeling
you can contribute to this project then please read on here.
Note that everyone is aware of the possibility of
using a mod-chip. The purpose of the thread is to find a way to create legal
backups that play in the PSX without any modifications.
Source: Club CD Freaks.com
