🥣 Chex Quest PSP

A port of Chex Quest (1996) to the PlayStation Portable, built on top of doomgeneric with a fully custom PSP platform layer.

Includes hardware-accelerated rendering via GU, full controller mapping, OPL2 FM music synthesis, and sound effects — all running natively on the PSP.

🔥 ALSO AVAILABLE ON PSVITA!

I have just released a native port for the PlayStation Vita! It features a custom OPL2 synthesizer, native resolution, and full optimization for the PSVITA hardware. 👉 Check out the Chex Quest PSVita Port here

📸 Screenshots

Coming soon

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✨ Features

• Hardware-accelerated rendering using sceGu (PSP GPU)
• 320×200 internal resolution scaled to 480×272 (PSP native)
• Full OPL2 FM synthesizer — software emulation with sine/exp lookup tables, ADSR envelopes, 9 OPL channels
• GENMIDI instrument loading directly from the WAD file
• MUS to MIDI conversion with full sequencer (tempo changes, looping, multi-track)
• 8-channel SFX mixing with per-channel volume and stereo panning
• Analog stick support for smooth movement and turning
• Weapon cycling via D-pad with time-based key release
• Quick Save / Quick Load mapped to D-pad
• Custom XMB assets — ICON0.PNG and PIC0.PNG embedded in EBOOT.PBP
• Automatic WAD detection — searches multiple paths on the Memory Stick
• Debug logging to debug.txt for troubleshooting
• CPU clocked to 333 MHz for maximum performance

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🎮 Controls

PSP Button	Action
Analog Stick	Move forward/backward, turn left/right
✕ (Cross)	Fire / Confirm / Yes
○ (Circle)	Use (open doors, activate switches)
□ (Square)	Toggle Automap
△ (Triangle)	Run (hold)
L Trigger	Strafe left
R Trigger	Strafe right
D-Pad Left	Previous weapon
D-Pad Right	Next weapon
D-Pad Up	Quick Save (F6)
D-Pad Down	Quick Load (F9)
Start	Menu (Escape)
Select	Confirm (Enter)

Quick Save: D-Pad Up (Saves to slot 0) Quick Load: D-Pad Down (Loads from slot 0) Note: Both have a 1-second cooldown. The in-game save/load menu does not work, please use these combos instead.

📦 Installation

Requirements

• A PSP with Custom Firmware (CFW) — e.g., PRO-C, ME, ARK, Infinity
• The Chex Quest WAD file (chex.wad) — freely available, it was originally distributed as a cereal box promotional game

Steps

1. Download ChexQuest-PSP.zip from the Releases page or from Actions artifacts
2. Extract the ChexQuest folder
3. Copy it to your Memory Stick:
4. Launch Chex Quest from the PSP XMB Game menu

WAD Search Paths

The game searches for the WAD file in this order:

1. ms0:/PSP/GAME/ChexQuest/chex.wad
2. ms0:/PSP/GAME/chexquest/chex.wad
3. ./chex.wad
4. chex.wad

If the WAD is not found, the game exits after 3 seconds. Check debug.txt for details.