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README.md
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README.md
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# PSNee V8.5
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THE modechip supports the largest number of Playstation 1 variants, and the largest number of microcontrollers
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## Features
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- Remove Disk Region Protection
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- Patch BIOS additional region features
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- A specific library for card support, to solve the fuse setting problem
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- The mode does not take care of changing PAL <-> NTSC video output
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## Supported Playstation 1
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All US models, all European models, and the vast majority of Japanese models.
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## Supported platforms
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- ATmega328(A/P/PA) @16Mhz
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- ATmega168(A/P/PA) @16Mhz
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- Atmega32U4 @16Mhz
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- ATtiny25/45/85 @8Mhz no BIOS patch!
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- ATtiny48/88 works in progress
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- LGT8F328 works in progress
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## Installation
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For all useful information consult the PDF
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## Model tested
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changelog
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changelog
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Update:july 2024
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-Reimplementation of support for MUCs ATtiny25/45/85, Atmega32u4
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-added support for MUC LGF8F328
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-------------------------------------------------------------
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Update: 9 oct 2023
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-Added support by brill & postal2201 of the bios patch for japanese consoles https://github.com/postal2201/PSNee_V8
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--------------------------------------------------------------
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Update: 16 August 2017
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-changed the timing for the PAL PM-41 patch to make it more reliable (I had it failing occasionally).
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Also I added a warning for people not to use 5V.
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--------------------------------------------------------------
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Update: 16 July 2017
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-The BIOS patch works!
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For now it only supports Arduino boards (ATmega chips).
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Also, the Arduino must either be powered on first or have no bootloader present (flashed using SPI) since I expect a signal ~1 second after power on.
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8Mhz boards are also supported.
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--------------------------------------------------------------
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Update: 10 July 2017
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- finished porting to ATtinyX5 (25,45,85 although the 25 has too little resources. for now.)
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- store the licensing symbols in flash again, frees a lot of RAM
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- bit retrieval code lifted from AttyNee (Nice work guys!)
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- extra RAM allows SoftwareSerial debugging prints on an ATtiny45!
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- nicer intro readme ;p
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---------------------------------------------------------------
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Update 9 July 2017
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Sure. Consider it work in progress quality ;)
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Main changes:
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- figured out ATtiny pin assignments :p
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- RAM use reduced by only storing the "SCE" part of the license string once. Using a somewhat farfetched method. Maybe someone can make it nicer, without the recursion and over engineering? :p
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- tried getting debug prints but it doesn't look like it'll happen (on ATtiny45), too little RAM > the chip crashes
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- SUBQ sampling timing reverted to sample while clock is low, instead of right after it goes high
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-------------------------------------------------------------
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Updat 29 June 2017
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- final modchip function I / Os: SQCK, SCLK, data, gate_wfck
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- hysteresis for injections, fixes anti-mod occasionally triggering when using worn drives
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- optimized injection timing for multi-region, multi BIOS versions (Sony added more protection checks over time)
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- first attempt to make it more portable to other Arduino variants
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- auto console detection works reliably, with and without Arduino bootloader present
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- pin assignments changed for practical / installation reasons (ICSP capability, wire routing)
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- so many changes, it surely contains all new bugs ;)
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Pin assignments are finalized. We can start producing final installation images / help!
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As always, I appreciate code reviews and bug fixes. I'm sorry some of it got so messy ;p
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psxdev
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------------------------------------------------------------
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Update 4 June 2017
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- unified SCEX injection function / easier to read code
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- PU-22+ now work without the WFCK wire (but depends on tight timings, tested on 8 and 16Mhz mcu)
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- interrupts disabled while sampling SUBQ > much better performance capturing all events correctly
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- now blinks the built-in LED on injections for debugging
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psxdev
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------------------------------------------------------------
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Update 31st May 2017
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- supports all motherboard versions except PU-41 (PAL) (will get to it!)
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- WFCK modulated injection method for PU-22 and up, just like the last multimode 3 chips
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- minimized CD controller interference: PsNee only ever speaks when it has to (also: full stealth)
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- not relying on BIOS delays: perfect boot disregarding extension cards etc
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- might not be bug free! I'm just one guy and testing on a dozen consoles takes time ;)
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psxdev
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-------------------------------------------------------------
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Update 27th of May 2017
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This version is compatible with 8Mhz and 16Mhz ATmega328 / Arduino boards.
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It uses polling to grab the SUBQ packets. This works better than relying on interrupts.
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I even have a few cycles to spare on a 8Mhz chip!
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psxdev
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--------------------------------------------------------------
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Update 15th of May 2017
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PSNee now watches the subchannel data and looks at the position information contained within.
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This allows deterministic SCEX injections. It knows (almost) exactly when to inject the SCEX string.
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Therefore it is now a stealth modchip :)
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Required connections: GND, VCC, data, gate, SQCL, SUBQ
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No more need to watch the PSX reset or lid open signals or any other typical modchip points (like "sync")
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WIP! Only tested on PU-18 board. Should work fine on PU-7, PU-8, PU-18 and PU-20.
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Will need adaption for PU-22 to PU-41 (SCPH-750x, 900x and PSOne).
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Note: Once this is installed in a PSX, mind the Pin13 LED that many Arduino boards have. Do not upload new sketches while the PSX is on!
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(If the PSX is on while uploading a sketch (making the LED blink), a voltage will be fed back into the SCLK pin on the HC-05 in the PSX.
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This didn't break my PSX in testing but it does stun the chip and halt CD operation. I'm thinking of a better method to do this but for now I need Arduino pin13..)
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Very much recommended to install a 3.3V chip!
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psxdev
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-------------------------------------------------------------
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Update 7th of May 2017
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Branched and tweaked for use with the Position 0 switch on a PSX laser.
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(Requires a bit of sticky tape at the point where the switch touches the laser assembly.)
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This allows deterministic SCEX injections, without relying on timing. Also gets rid of connection wires for LID and RESET.
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WIP!
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psxdev
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--------------------------------------------------------------
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New in this version! V6
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--------------------------------------------------------------
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A lot!
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- The PAL SCPH-102 NTSC BIOS-patch works flawlessly! For speed reasons this is implemented in bare
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AVR C. It is functionally identical to the OneChip modchip, this modchip firmware was disassembled,
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documented (available on request, but written in Dutch...) and analyzed with a logic analyzer to
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make sure PsNee works just as well.
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- The code now is segmented in functions which make the program a lot more maintable and readable
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- Timing is perfected, all discs (both backups and originals of PAL and NTSC games) now work in the
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PAL SCPH-102 test machine
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- It was found out that the gate signal doesn't havbe to be hooked up to a PAL SCPH-102 Playstation
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to circumvent the copy protection. This is not tested on other Playstation models so the signal still
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is available
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- The /xlat signal is no longer required to time the PAL SCPH-102 NTSC BIOS-patch
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- Only AVR PORTB is used for compatibility reasons (almost all the AVR chips available have PORTB)
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-------------------------------------------------------------
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A minor detail: The lid detection is missing its digitalRead() ;p
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psxdev
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-------------------------------------------------
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VERSION 2! :D
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-------------------------------------------------
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What has changed?
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- Thanks to TriMesh, the gate-pin is now also used to determine in which model of
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Playstation PsNee is installed. The modchip algorithm thus can be optimized for
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optimal performance on specific Playstation revisions. This works by monitoring
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whether a clock signal is present on this pin - when there is one, the modchip is
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installed in a PU-22, PU-23 or PSOne Playstation, else it is installed in an older
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model Playstation. In this version of PsNee, nothing is actually done with this information.
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- Thanks to -again- TriMesh, NTSC support for PAL SCPH-102 Playstations is added! This uses
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the same method the OneChip modchip used for achieving this:
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1. Monitor the XLAT signal from the CD mechanism controller chip. This requires
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another connection to the Playstation. When this signal is 0, the first CD copy
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protection is passed! After this, there is another one.
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2. After this, watch the Address18-pin (pin 31) on the BIOS-chip. When this signal
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is high, this means the second CD copy protection is about to run.
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3. Wait a short time.
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4. Pull the Data2-pin (pin 15) on the BIOS-chip to 0. This effectively blocks the
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execution of the region check of the inserted disc.
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5. The Playstation plays the inserted disc and doesn't care whether it's PAL or NTSC!
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6. Release the 0 of the Data2-pin.
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To correctly output a PAL video color signal for a PAL TV on a PAL PSOne with an NTSC disc
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inserted, Pin 3 of IC502 must be grounded with an external switch. The modchip also could do
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this, although we would need a device with more pins available.
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- The outputted data signal is now "sliced up" to improve (or less distort) the tracking
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signal from the CD mechanism: later Playstations use the CD tracking signal for transmitting
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the SCEx-string to the Playstation instead of using a seperate connection, so when the modchip
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forces a 0 on the data-pin, the tracking signal also is gone temporarily. By slicing the data-
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signal up in little pieces at least some of the tracking signal remains and the Playstation can
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read discs more easily.
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- The two big for-loops are combined into one with an OR-statement describing the two conditions
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modchip should be active: when flagFirstCycle = 0 or when flagFirstCycle = 1 and the lid is opened
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and closed again. This makes code maintenance easier.
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- The pin-out of the modchip is changed slightly to be able to use an interrupt for the PAL=>NTSC
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BIOS-patch for PAL SCPH-102. Please use the revised pin-out found below with this code.
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~TheFrietMan, The Netherlands
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