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https://github.com/kalymos/PsNee.git
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Added support for the SCPH-5903
The mod for this model was developed by analyzing signals and adjusting the lead-in frames to accurately distinguish game discs from Video CDs (VCDs) and audio CDs. Additionally, this update fixes an issue where game discs were occasionally misidentified and read as music discs.
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kalymos
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@ -22,13 +22,15 @@
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//#define SCPH_3000 // DX - D5, for 40-pin BIOS: AX - A6, AY - A7, for 32-pin BIOS: AX - A7, AY - A8. BIOS ver. 1.1j, CRC 3539DEF6
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//#define SCPH_1000 // DX - D5, for 40-pin BIOS: AX - A6, AY - A7, for 32-pin BIOS: AX - A7, AY - A8. BIOS ver. 1.0j, CRC 3B601FC8
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//PS1 Video CD:
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#define SCPH_5903 // PU-16, SCPH-5903
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//------------------------------------------------------------------------------------------------
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// Select your chip
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//------------------------------------------------------------------------------------------------
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//#define ATmega328_168
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//#define ATmega32U4_16U4
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#define ATmega32U4_16U4
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//#define ATtiny85_45_25
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/*
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@ -425,26 +427,74 @@ int main() {
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// While the laser lens moves to correct for the error, they can pick up a few TOC sectors.
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//************************************************************************
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//This variable initialization macro is to replace (0x41) with a filter that will check that only the three most significant bits are correct. 0x001xxxxx
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uint8_t isDataSector = (((scbuf[0] & 0x40) == 0x40) && (((scbuf[0] & 0x10) == 0) && ((scbuf[0] & 0x80) == 0)));
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//This variable initialization macro is to replace (0x41) with a mask so that
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//only the three most significant bits are checked. 0b001xxxxx = data sector (0x41)
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uint8_t isDataSector = (((scbuf[0] & 0x40) == 0x40) &&
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(((scbuf[0] & 0x10) == 0) && ((scbuf[0] & 0x80) == 0)));
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#ifdef SCPH_5903
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// ----------------------------------------------------------------------
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// Special heuristics for SCPH-5903 (VCD):
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// - VCD: A0/A1/A2 + scbuf[3] == 0x02
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// - games (original + copies): A0/A1/A2 + scbuf[3] != 0x02
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// Audio CDs are not supported because isDataSector == 0.
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// ----------------------------------------------------------------------
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bool isVcdLeadIn =
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isDataSector &&
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scbuf[1] == 0x00 &&
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scbuf[6] == 0x00 &&
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(scbuf[2] == 0xA0 || scbuf[2] == 0xA1 || scbuf[2] == 0xA2) &&
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(scbuf[3] == 0x02); // VCD: A0/A1/A2 are 0x02
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bool isPsxLeadIn =
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isDataSector &&
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scbuf[1] == 0x00 &&
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scbuf[6] == 0x00 &&
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(scbuf[2] == 0xA0 || scbuf[2] == 0xA1 || scbuf[2] == 0xA2) &&
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(scbuf[3] != 0x02); // PAL/NTSC games: 0x05, 0x98, etc., but not 0x02
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if (isPsxLeadIn) {
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// we see the classic lead-in of the game → we increase the hysteresis
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hysteresis++;
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}
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else if (hysteresis > 0 &&
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!isVcdLeadIn && // VCD cannot increment the counter
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((scbuf[0] == 0x01 || isDataSector) &&
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scbuf[1] == 0x00 &&
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scbuf[6] == 0x00)) {
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// "the disc wobbles into the CD-DA space" – the second stage is the same as in the original,
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// but only if it's not a VCD
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hysteresis++;
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}
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else if (hysteresis > 0) {
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// noise / other sectors – the counter is slowly fading out
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hysteresis--;
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}
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#else
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// Original heuristics for other consoles
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if (
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(isDataSector && scbuf[1] == 0x00 && scbuf[6] == 0x00) && // [0] = 41 means psx game disk. the other 2 checks are garbage protection
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(scbuf[2] == 0xA0 || scbuf[2] == 0xA1 || scbuf[2] == 0xA2 || // if [2] = A0, A1, A2 ..
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(scbuf[2] == 0x01 && (scbuf[3] >= 0x98 || scbuf[3] <= 0x02))) // .. or = 01 but then [3] is either > 98 or < 02
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(isDataSector && scbuf[1] == 0x00 && scbuf[6] == 0x00) &&
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// 0x41 means psx game disk. the other 2 checks are garbage protection
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(scbuf[2] == 0xA0 || scbuf[2] == 0xA1 || scbuf[2] == 0xA2 ||
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(scbuf[2] == 0x01 && (scbuf[3] >= 0x98 || scbuf[3] <= 0x02)))
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) {
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hysteresis++;
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}
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// This CD has the wobble into CD-DA space. (started at 0x41, then went into 0x01)
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else if (hysteresis > 0 && ((scbuf[0] == 0x01 || isDataSector) && (scbuf[1] == 0x00 /*|| scbuf[1] == 0x01*/) && scbuf[6] == 0x00)) {
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hysteresis++;
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else if (hysteresis > 0 &&
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((scbuf[0] == 0x01 || isDataSector) &&
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(scbuf[1] == 0x00 /*|| scbuf[1] == 0x01*/) &&
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scbuf[6] == 0x00)) {
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hysteresis++;
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}
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// None of the above. Initial detection was noise. Decrease the counter.
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else if (hysteresis > 0) {
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hysteresis--;
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hysteresis--;
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}
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#endif
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// hysteresis value "optimized" using very worn but working drive on ATmega328 @ 16Mhz
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// should be fine on other MCUs and speeds, as the PSX dictates SUBQ rate
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@ -112,6 +112,10 @@
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#define TRIGGER2 71
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#endif
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#ifdef SCPH_5903
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#define SCEI
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#endif
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#ifdef SCEA
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const char region[1] = {'a'};
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#endif
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@ -131,11 +135,12 @@ const char region[3] = {'a', 'e', 'i'};
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#if !defined(SCPH_xxx1) && !defined(SCPH_xxx2) && !defined(SCPH_103) && \
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!defined(SCPH_102) && !defined(SCPH_100) && !defined(SCPH_7000_9000) && \
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!defined(SCPH_5500) && !defined(SCPH_3500_5000) && !defined(SCPH_3000) && \
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!defined(SCPH_1000) && !defined(SCPH_xxxx)
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!defined(SCPH_1000) && !defined(SCPH_xxxx) && !defined(SCPH_5903)
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#error "Console not selected! Please uncoment #define with SCPH model number."
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#elif !(defined(SCPH_xxx1) ^ defined(SCPH_xxx2) ^ defined(SCPH_103) ^ \
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defined(SCPH_102) ^ defined(SCPH_100) ^ defined(SCPH_7000_9000) ^ \
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defined(SCPH_5500) ^ defined(SCPH_3500_5000) ^ defined(SCPH_3000) ^ \
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defined(SCPH_1000) ^ defined(SCPH_xxxx))
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defined(SCPH_102) ^ defined(SCPH_100) ^ defined(SCPH_7000_9000) ^ \
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defined(SCPH_5500) ^ defined(SCPH_3500_5000) ^ defined(SCPH_3000) ^ \
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defined(SCPH_1000) ^ defined(SCPH_xxxx) ^ defined(SCPH_5903))
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#error "May be selected only one console! Please check #define with SCPH model number."
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#endif
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@ -1,3 +1,12 @@
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Update: December 22, 2025
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-Added support for the SCPH-5903 model:
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The mod for this model was developed by analyzing signals and adjusting the lead-in frames to accurately distinguish game discs from Video CDs (VCDs) and audio CDs. Additionally, this update fixes an issue where game discs were occasionally misidentified and read as music discs.
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By RepairBox
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------------------------------------------------------------
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Update:mars 2025
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-Added led support for ATtiny
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