diff --git a/PsNee.ino b/PsNee.ino new file mode 100644 index 0000000..a53d742 --- /dev/null +++ b/PsNee.ino @@ -0,0 +1,254 @@ +//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| +//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| +//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| +//||||||MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM||||| +//||||||M*************************************************************M||||| +//||||||M*************************************************************M||||| +//||||||M***QQQQQQQQQ***************Q******Q**************************M||||| +//||||||M***Q********Q**************QQ*****Q**************************M||||| +//||||||M***Q********Q**************QQ*****Q**************************M||||| +//||||||M***Q********Q**************Q*Q****Q**************************M||||| +//||||||M***Q********Q**************Q*Q****Q**************************M||||| +//||||||M***Q********Q**************Q*Q****Q**************************M||||| +//||||||M***Q********Q**************Q**Q***Q**************************M||||| +//||||||M***QQQQQQQQQ***************Q**Q***Q**************************M||||| +//||||||M***Q***********QQQQQQQQ****Q***Q**Q******QQQQ*******QQQQ*****M||||| +//||||||M***Q**********QQ******Q****Q***Q**Q*****QQ**Q******QQ**Q*****M||||| +//||||||M***Q**********Q************Q***Q**Q****QQ***Q*****Q***QQ*****M||||| +//||||||M***Q**********QQQ**********Q****Q*Q***QQ**QQQ****QQQQQQ******M||||| +//||||||M***Q************QQQQQ******Q****Q*Q***QQQQQ******QQ**********M||||| +//||||||M***Q****************QQQ****Q*****QQ**QQ**********Q***********M||||| +//||||||M***Q******************Q****Q*****QQ**Q**********QQ***********M||||| +//||||||M***Q**********Q*******QQ***Q*****QQ**Q******QQ**Q******QQ****M||||| +//||||||M***Q**********QQ******QQ***Q******Q**QQ****QQ***QQ****QQ*****M||||| +//||||||M***Q***********QQQQQQQQ****Q******Q***QQQQQ******QQQQQQ******M||||| +//||||||M*************************************************************M||||| +//||||||M*************************************************************M||||| +//||||||MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM||||| +//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| +//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| +//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| +// +//PsNee, an open source stealth modchip for the Sony Playstation 1, usable on +//all platforms supported by Arduino, preferably ATTiny. Finally something modern! +// +/////////// TO DO: ///////////// +// - Find out how the NTSC BIOS patch for SCPH-102 works and integrate it in this sketch +// (supposedly it forces pin 15 (data 2) on the BIOS chip (IC102) low when something happens on pin 31 (address 18) according to http://problemkaputt.de/psx-spx.htm#cdromprotectionmodchips) +// - Make SCEx-arrays smaller by commoning up the common parts of the arrays and thus use less flash +// - Common up the two big for-loops with an OR-statement +//////////////////////////////// +// +//PLAYSTATION 1 SECURITY - HOW IT DOES IT'S THING: +//Sony didn't really go through great lenghts to protect it's precious Playstation +//from running unauthorised software; the main security is based on a simple ASCII +//string of text that is read from a part of an original Playstation disc that cannot +//be reproduced by an ordinary PC CD burner. +//As most of you will know, a CD is basically a very long rolled up (carrier) string in which very +//little pits and ehm... little not-pits are embedded that represent the data stored on the disc. +//The nifty Sony engineers did not use the pits and stuff to store the security checks for +//Playstation discs but went crazy with the rolled up carrier string. In an ordinary CD, the +//string is rolled up so that the spacing between the tracks is as equal as possible. If that +//namely is not the case, the laser itself needs to move a bit to keep track of the track and +//reliably read the data off the disc. +//If you wonder how the laser knows when it follows the track optimally: four photodiodes, light +//intensity measurement, difference measurements, servo. There. +//To the point: the Sony engineers decidedly "fumbled up" the track of sector 4 on a Playstation +//disc (the track was modulated in nerd-speak) so that the error correction circuit outputs a +//recognisable signal, as the laser needs to be corrected to follow the track optimally. +//This outputted signal actually is a 250bps serial bitstream (with 1 startbit and 2 stopbits) which +//in plain ASCII says SCEA (Sony Computer Entertainment of America), SCEE (Sony Computer Entertainment +//of Europe) or SCEI (Sony Computer Entertainment of Japan), depending on the region of the disc inserted. +//The security thus functions not only as copy protection, but also as region protection. +//The text string from the disc is compared with the text string that is embedded in the Playstation +//hardware. When these text strings are the same, the disc is interpreted to be authentic and from +//the correct region. Bingo! +// +//HOW THE MODCHIP TRICKS THE PLAYSTATION: +//The modchip isn't all that of a complicated device: clever reverse engineers found the point on the +//Playstation motherboard that carried the text string from the disc and found a way to temporarily block +//this signal (by grounding an input of an op-amp buffer) to be able to inject the signal from the modchip +//The modchip injects after about 1500ms the text strings SCEE SCEA SCEI on the motherboard point and stops +//with this after about 25 seconds. Because all the possible valid region options are outputted on the +//motherboard the Playstation gets a bit confused and simply accepts the inserted disc as authentic; after all, +//one of the codes was the same as that of the Playstation hardware... +//Early modchips applied the text strings as long as there was applied power to them, whereby later Playstation +//software could detect whether a modchip was installed. This is circumvented in this application by idling the +//modchip after about 25 seconds. The text strings are only tranmitted again when the CD lid is opened and closed +//again, to enable playing multi-disc games. This is also called a stealth modchip in marketing-speak. +// +//This code is verified on an ATTiny45 with the 8MHz internal oscillator using a Saleae Logic Analyser, timing is +//reasonable important in this application. +//Kindly coded and documented by TheFrietMan, August 20 2015, The Netherlands. +//The Playstation is great but nothing beats our national pride, the Philips CDi! Cheesiness for the win! +// +//PINOUT IC: +// ATTiny45: +// Pin 1: Not connected +// Pin 2: Not connected +// Pin 3: Not connected +// Pin 4: Ground +// Pin 5: OUT - Data +// Pin 6: OUT - Gate +// Pin 7: IN - CD lid +// Pin 8: Vcc +//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// + +#include //Include the Flash library to conveniently store the SCExData-arrays in PROGMEM, see http://arduiniana.org/libraries/flash/ + +//BLOODY GLOBAL VARIABLES +//Pins for the Arduino Uno +int data = 8; //The pin that outputs the SCEE SCEA SCEI string +int gate = 9; //The pin that gets pulled low to enable data injection on the Playstation motherboard +int lid = 10; //The pin that gets connected to the internal CD lid signal; active high + +//Pins for the ATTiny45 Arduino +//int data = 0; +//int gate = 1; +//int lid = 2; +boolean flagFirstCycle = 0; //This flag is 1 when the system completes the first cycle of SCEx-string outputting; this is done to stealth the chip up + +void setup() +{ + pinMode(data, INPUT); //The pins are high-impedance when configured as inputs so they don't interfere with the Playstation mortherboard circuitry + pinMode(gate, INPUT); + pinMode(lid, INPUT); + + delay(1200); //Wait a second before we're really heading off +} + +void loop() +{ //The bitstreams are reversed (because LSB) and inverted (because the buffer we're injecting our signal after also inverted it's input) + //VARIABLES // Start Data Stop + FLASH_ARRAY (boolean, SCEEData, 1,0,0,1,1,0,1,0,1,0,0,1,0,0,1,1,1,1,0,1,0,0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,0,1,1,1,0,1,0,0); //SCEE: 1 00110101 00, 1 00111101 00, 1 01011101 00, 1 01011101 00 44 bits total + FLASH_ARRAY (boolean, SCEAData, 1,0,0,1,1,0,1,0,1,0,0,1,0,0,1,1,1,1,0,1,0,0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,1,1,1,1,0,1,0,0); //SCEA: 1 00110101 00, 1 00111101 00, 1 01011101 00, 1 01111101 00 + FLASH_ARRAY (boolean, SCEIData, 1,0,0,1,1,0,1,0,1,0,0,1,0,0,1,1,1,1,0,1,0,0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,1,0,1,1,0,1,0,0); //SCEI: 1 00110101 00, 1 00111101 00, 1 01011101 00, 1 01101101 00 + int arraycounter; + int datacounter; + boolean lidstatus = digitalRead(lid); + + if (flagFirstCycle == 0) + { + pinMode(gate, OUTPUT); + digitalWrite(gate, 0); //Pull to ground to enable data injecting + + for (datacounter = 0; datacounter < 31; datacounter = datacounter + 1) //One cycle of SCEx-string outputting takes approximately 744 ms; we want to go on for about 25 seconds so we output the cycle 30 times + { + for (arraycounter = 0; arraycounter < 44; arraycounter = arraycounter + 1) + { + if (SCEEData[arraycounter] == 0) + { + pinMode(data, OUTPUT); //We pull the data pin to ground to force a 0 + digitalWrite(data, 0); + delay(4); //Send the signal for 4 ms + } + else + { + pinMode(data, INPUT); //We make the data pin high-impedance to let the pull-up of the Playstation motherboard make a 1 + delay(4); + } + } + delay(64); //According to the logic analyser the time between two bitstreams now approximates 72 ms on an ATTiny45 with built-in 8MHz oscillator, just like the doctor ordered + + for (arraycounter = 0; arraycounter < 44; arraycounter = arraycounter + 1) + { + if (SCEAData[arraycounter] == 0) + { + pinMode(data, OUTPUT); //We pull the data pin to ground to force a 0 + digitalWrite(data, 0); + delay(4); + } + else + { + pinMode(data, INPUT); //We make the data pin high-impedance to let the pull-up of the Playstation motherboard make a 1 + delay(4); + } + } + delay(64); + + for (arraycounter = 0; arraycounter < 44; arraycounter = arraycounter + 1) + { + if (SCEIData[arraycounter] == 0) + { + pinMode(data, OUTPUT); //We pull the data pin to ground to force a 0 + digitalWrite(data, 0); + delay(4); + } + else + { + pinMode(data, INPUT); //We make the data pin high-impedance to let the pull-up of the Playstation motherboard make a 1 + delay(4); + } + } + delay(64); + } + pinMode(data, INPUT); //Make all outputting pins high-impedance again when we're finished + pinMode(gate, INPUT); + flagFirstCycle = 1; //We completed the initial round of SCEx-outputting; only do this again when a new CD is inserted while the Playstation is turned on! + } + + //Only force authentication when this isn't the first cycle and the lid has been opened and closed again + if ((flagFirstCycle != 0) && (lidstatus != 0)) + { + delay(50); //Extra delay to compensate for the state-switching of the CD lid + if (lidstatus == 0) //Only do your thing when the lid is closed again + { + delay(100); //Just wait a second until the coast is clear + pinMode(gate, OUTPUT); + digitalWrite(gate, 0); //Pull to ground to enable data injecting + + for (datacounter = 0; datacounter < 31; datacounter = datacounter + 1) //One cycle of SCEx-string outputting takes approximately 744 ms; we want to go on for about 25 seconds so we output the cycle 30 times + { + for (arraycounter = 0; arraycounter < 44; arraycounter = arraycounter + 1) + { + if (SCEEData[arraycounter] == 0) + { + pinMode(data, OUTPUT); //We pull the data pin to ground to force a 0d + digitalWrite(data, 0); + delay(4); + } + else + { + pinMode(data, INPUT); //We make the data pin high-impedance to let the pull-up of the Playstation motherboard make a 1 + delay(4); + } + } + delay(64); //Volgens de logic analyser is de tijd tussen de twee bitstreams nu precies 72 ms op een ATTiny45 met ingebouwde 8MHz oscillator, zoals het zou moeten zijn + + for (arraycounter = 0; arraycounter < 44; arraycounter = arraycounter + 1) + { + if (SCEAData[arraycounter] == 0) + { + pinMode(data, OUTPUT); //We pull the data pin to ground to force a 0 + digitalWrite(data, 0); + delay(4); + } + else + { + pinMode(data, INPUT); //We make the data pin high-impedance to let the pull-up of the Playstation motherboard make a 1 + delay(4); + } + } + delay(64); + + for (arraycounter = 0; arraycounter < 44; arraycounter = arraycounter + 1) + { + if (SCEIData[arraycounter] == 0) + { + pinMode(data, OUTPUT); //We pull the data pin to ground to force a 0 + digitalWrite(data, 0); + delay(4); + } + else + { + pinMode(data, INPUT); //We make the data pin high-impedance to let the pull-up of the Playstation motherboard make a 1 + delay(4); + } + } + delay(64); + } + pinMode(data, INPUT); //Make all outputting pins high-impedance again when we're finished + pinMode(gate, INPUT); + } + } +}