Thank ya 4 d answers.
We're coming now to the final level - explanation and the following proofen ability for rebuilding!
Of course this is most of the time missing with LRLs here...
Rebuilding yes, if some useful schematics are available, but the evidence of real working often is far far away like the gold-treasures....
Perhaps because a schematic alone simply is not enough!
The creators - like I will do in this example - have also to explain what kind of technical principle
lies behind - not to confuse with
lying!
In our case here the secret key is encoded into the sound-data. The PSX uses 3 different country regions (Europe, America and Japan) so the soundfile has all of them present (see picture). Those are repeated for 30sec so there is plenty of time for bootup.
The goldwave capture shows you below that 1 sequence (for 1 country) incl. pause lasts 250 milli sec.
I did create this soundfile with high amplified 22khz signals and those have the exactly same structure as the digital modchip "on off" pulses!
The sound-file is an uncompressed wav so there is no loss and the final trick is very simple - now listen:
You only have to unscrew the PSXs plastic cover and locate the ribbon-cable of the laser unit. Solder a small wire to PIN 5! where that cable is connected to the mainboard (you can even solder it direct, but ribbon cables are a bit problematic for this). Connect a second wire to PSX ground - you can find this everywhere.
Now solder a small 3.5mm audio jack to those wires, ground to ground and the signal line secured by some 1k resistor, and you're ready to go!
Use some 1m male to male 3,5mm audio-plug cable and start with low volume you just have to play the special audio file and the PSX will boot!
It really is that extremly simple!!!
This is a very nice demonstration how easy you can hack digital devices with analog equipment or data-streams!
I shouldn't have told you here about such possibilities but instead secret services & Co., just I really wanted to prove you that there exists "secret special technical tricks" you don't know anything about and simply cannot or won't believe until you build, test and see that it works! btw. this CD unit Pin 5 picture below is exactly the region I did cut out on the 'Circuit Diagram' above.
Well, now you have all what's needed to proof it on your own!
And the same method we have to use with LRLs until we get such a device successfully to work and understand how it works!
We really shouldn't waste our very precious time of life by LRL half-knowledge, guessing, joking or disputing - this only will destroy our important motivation -, but in constructive investigation, experiments and electronic enineering!