Beetle PSX is a fork of the Mednafen PSX module for Libretro, it currently runs on Linux, macOS and Windows.
¶ 
License
This core is under GPLv2 license.
¶ 
Compatibility
| RPI0/RPI1 | RPI3 | RPI4/RPI400 | RPI5 | ODROID XU4 | OGA/OGS/RG351 | PC | RG353 |
|---|---|---|---|---|---|---|---|
| ❌ | ❌ | ✅ | ✅ | ❌ | ✅ | ✅ | ✅ |
¶ 
Features
| Feature | Supported |
|---|---|
| Restart | ✔ |
| Screenshots | ✔ |
| Saves | ✔ |
| States | ✔ |
| Rewind | ✔ |
| Core Options | ✔ |
| RetroAchievements | ✔ |
| RetroArch Cheats | ✔ |
| Controls | ✔ |
| Remapping | ✔ |
| Multi-Mouse | ✔ |
| Rumble | ✔ |
| Disk Control | ✔ |
¶ 
BIOS
¶ List of mandatory bios
| Filename | Description | MD5 | Provided |
|---|---|---|---|
| scph5500.bin | Japanese PS1 BIOS - required for japanese games | 8dd7d5296a650fac7319bce665a6a53c | ❌ |
| scph5501.bin | American PS1 BIOS - required for american games | 490f666e1afb15b7362b406ed1cea246 | ❌ |
| scph5502.bin | European PS1 BIOS - required for europena games | 32736f17079d0b2b7024407c39bd3050 | ❌ |
¶ Location
Put the bios like this:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 bios
┃ ┃ ┃ ┣ 🗒 scph5500.bin
┃ ┃ ┃ ┣ 🗒 scph5501.bin
┃ ┃ ┃ ┣ 🗒 scph5502.bin
¶ 
Isos
¶ Supported extensions
Isos must have the extension:
- .bin/.cue
- .bin/.toc
- .chd
- .exe
- .img/.ccd/.sub
- .m3u
- .pbp
¶ Location
Put the isos like this:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 roms
┃ ┃ ┃ ┣ 📁 psx
┃ ┃ ┃ ┃ ┣ 🗒 game.bin
┃ ┃ ┃ ┃ ┣ 🗒 game.cue
The isos using Redump format are highly recommended.
For more information about isos, go to this tutorial!
¶ 
Advanced configuration of the emulator
To be able to keep your custom configurations during an upgrade, we advise you to use our configuration override feature.
¶ Accessing to options
You can configure various options in two different ways.
- Via RetroArch menu:
┣ 📁 RetroArch Menu
┃ ┣ 📁 Core options
┃ ┃ ┣ 🧩 Name_option
- Via the file
retroarch-core-options.cfg:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 system
┃ ┃ ┃ ┣ 📁 configs
┃ ┃ ┃ ┃ ┣ 📁 retroarch
┃ ┃ ┃ ┃ ┃ ┣ 📁 cores
┃ ┃ ┃ ┃ ┃ ┃ ┣ 🧩 retroarch-core-options.cfg
¶ Core options
| Options | Options values | Variables (for configuration override) | Variables values |
|---|---|---|---|
| Internal GPU Resolution | 1x (Native) ✅ / 2x / 4x / 8x / 16x |
beetle_psx_internal_resolution |
1x(native) / 2x / 4x / 8x / 16x |
| Internal Color Depth | 16 bpp (Native) ✅ / 32 bpp |
beetle_psx_depth |
16bpp(native) / 32 bpp |
| Dithering Pattern | 1x (Native) ✅ / Internal Resolution / Disabled |
beetle_psx_dither_mode |
1x(native) / internal resolution / disabled |
| Texture UV Offset | Enabled ✅ / Disabled |
beetle_psx_scaled_uv_offset |
enabled / disabled |
| Texture Filtering | Nearest ✅ / SABR / xBR / Bilinear / 3-Point / JINC2 |
beetle_psx_filter |
nearest / SABR / xBR / bilinear / 3-point / JINC2 |
| Exclude Sprites from Filtering | Disabled ✅ / Opaque Only / Opaque and Semi-Transparent |
beetle_psx_filter_exclude_sprite |
disable / opaque / all |
| Exclude 2D Polygons from Filtering | Disabled ✅ / Opaque Only |
beetle_psx_filter_exclude_2d_polygon |
disable / opaque / all |
| Adaptive Smoothing | Disabled ✅ / Enabled |
psx_adaptive_smoothing |
disabled / enabled |
| Supersampling (Downsample to Native Resolution) | Disabled ✅ / Enabled |
psx_super_sampling |
disabled / enabled |
| Multi-Sampled Anti Aliasing | 1x (Default) ✅ / 2x / 4x / 8x / 16x |
psx_msaa |
1x / 2x / 4x / 8x / 16x |
| MDEC YUV Chroma Filter | Disabled ✅ / Enabled |
psx_mdec_yuv |
disabled / enabled |
| Track Textures | Disabled ✅ / Enabled |
beetle_psx_track_textures |
disabled / enabled |
| Dump Textures | Disabled ✅ / Enabled |
beetle_psx_dump_textures |
disabled / enabled |
| Replace Textures | Disabled ✅ / Enabled |
beetle_psx_replace_textures |
disabled / enabled |
| Wireframe Mode (Debug) | Disabled ✅ / Enabled |
beetle_psx_wireframe |
disabled / enabled |
| Frame Duping (Speedup) | Disabled ✅ / Enabled |
psx_frame_duping |
disabled / enabled |
| Display Internal FPS | Disabled ✅ / Enabled |
beetle_psx_display_internal_fps |
disabled / enabled |
| Display Full VRAM (Debug) | Disabled ✅ / Enabled |
beetle_psx_dispaly_vram |
disabled / enabled |
| Analog Self-Calibration | Disabled ✅ / Enabled |
beetle_psx_analog_calibration |
disabled / enabled |
| Enable DualShock Analog Mode Toggle | Disabled ✅ / Enabled |
beetle_psx_analog_toggle |
disabled / enabled |
| DualShock Analog Mode Combo | L1 + L2 + R1 + R2 + Start + Select / L1 + R1 + Select ✅ / L1 + R1 + Start / L1 + R1 + L3 / L1 + R1 + R3 / L2 + R2 + Select / L2 + R2 + Start / L2 + R2 + L3 / L2 + R2 + R3 / L3 + R3 |
beetle_psx_analog_toggle_combo |
l1+l2+r1+r2+start+select / l1+r1+select / l1+r1+start / l1+r1+l3 / l1+r1+r3 / l2+r2+select / l2+r2+start / l2+r2+l3 / l2+r2+r3 / l3+r3 |
| DualShock Analog Mode Combo Hold Delay | 0 Second Delay / 1 Second Delay / 2 Seconds Delay / 3 Seconds Delay / 4 Seconds Delay / 5 Seconds Delay |
beetle_psx_analog_toggle_hold |
0 / 1 / 2 / 3 / 4 / 5 |
| Port 1: Multitap Enable | Disabled ✅ / Enabled |
beetle_psx_enable_multitap_port1 |
disabled / enabled |
| Port 2: Multitap Enable | Disabled ✅ / Enabled |
beetle_psx_enable_multitap_port2 |
disabled / enabled |
| Gun Input Mode | Light Gun ✅ / Touchscreen |
beetle_psx_gun_input_mode |
lightgun / touchscreen |
| Gun Cursor | Cross ✅ / Dot / Disabled |
beetle_psx_gun_cursor |
cross / dot / off |
| Port 1: Gun Crosshair Color | Red ✅ / Blue / Green / Orange / Yellow / Cyan / Pink / Purple / Black / White |
beetle_psx_crosshair_color_p1 |
red / blue / green / orange / yellow / cyan / pink / purple / black / white |
| Port 2: Gun Crosshair Color | Blue ✅ / Red / Green / Orange / Yellow / Cyan / Pink / Purple / Black / White |
beetle_psx_crosshair_color_p2 |
blue / red / green / orange / yellow / cyan / pink / purple / black / white |
| Mouse Sensitivity | 5% / 10% / 15% / 20% / 25% / 30% / 35% / 40% / 45% / 50% / 55% / 60% / 65% / 70% / 75% / 80% / 85% / 90% / 95% / 100% ✅ / 105% / 110% / 115% / 120% / 125% / 130% / 135% / 140% / 145% / 150% / 155% / 160% / 165% / 170% / 175% / 180% / 185% / 190% / 195% / 200% |
beetle_psx_mouse_sensitivity |
5% / 10% / 15% / 20% / 25% / 30% / 35% / 40% / 45% / 50% / 55% / 60% / 65% / 70% / 75% / 80% / 85% / 90% / 95% / 100% / 105% / 110% / 115% / 120% / 125% / 130% / 135% / 140% / 145% / 150% / 155% / 160% / 165% / 170% / 175% / 180% / 185% / 190% / 195% / 200% |
| NegCon Twist Responses | Linear ✅ / Quadratic / Cubic |
beetle_psx_negcon_response |
linear / quadratic / cubic |
| NegCon Twist Deadzone | 0% ✅ / 5% / 10% / 15% / 20% / 25% / 30% |
beetle_psx_negcon_deadzone |
5% / 10% / 15% / 20% / 25% / 30% |
| Memory Card 0 Method (Restart Required) | Libretro ✅ / Mednafen |
beetle_psx_use_mednafen_memcard0_method |
libretro / mednafen |
| Enable Memory Card 1 (Restart Required) | Enabled ✅ / Disabled |
beetle_psx_enable_memcard1 |
enabled / disabled |
| Shared Memory Cards (Restart Required) | Enabled ✅ / Disabled |
beetle_psx_shared_memory_cards |
enabled / disabled |
| Memory Card Left Index | 0 ✅ / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 / 41 / 42 / 43 / 44 / 45 / 46 / 47 / 48 / 49 / 50 / 51 / 52 / 53 / 54 / 55 / 56 / 57 / 58 / 59 / 60 / 61 / 62 / 63 |
beetle_psx_memcard_left_index |
0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 / 41 / 42 / 43 / 44 / 45 / 46 / 47 / 48 / 49 / 50 / 51 / 52 / 53 / 54 / 55 / 56 / 57 / 58 / 59 / 60 / 61 / 62 / 63 |
| Memory Card Right Index | 0 / 1 ✅ / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 / 41 / 42 / 43 / 44 / 45 / 46 / 47 / 48 / 49 / 50 / 51 / 52 / 53 / 54 / 55 / 56 / 57 / 58 / 59 / 60 / 61 / 62 / 63 |
beetle_psx_memcard_right_index |
0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 / 41 / 42 / 43 / 44 / 45 / 46 / 47 / 48 / 49 / 50 / 51 / 52 / 53 / 54 / 55 / 56 / 57 / 58 / 59 / 60 / 61 / 62 / 63 |
| PGXP Operation Mode | Disabled ✅ / Memory Only / Memory + CPU (Buggy) |
beetle_psx_pgxp_mode |
disabled / memory only / memory + CPU |
| PGXP 2D Geometry Tolerance | Disabled ✅ / 1px / 2px / 3px / 4px / 5px / 6px / 7px / 8px |
beetle_psx_pgxp_2d_tol |
disabled / 1px / 2px / 3px / 4px / 5px / 6px / 7px / 8px |
| PGXP Primitive Culling | Disabled ✅ / Enabled |
beetle_psx_pgxp_nclip |
disabled / enabled |
| PGXP Vertex Cache | Disabled ✅ / Enabled |
beetle_psx_pgxp_vertex |
disabled / enabled |
| PGXP Perspective Correct Texturing | Disabled ✅ / Enabled |
beetle_psx_pgxp_texture |
disabled / enabled |
| Line-to-Quad Hack | Default ✅ / Aggressive / Disabled |
beetle_psx_line_render |
default / aggressive / disabled |
| Widescreen Mode Hack | Disabled ✅ / Enabled |
beetle_psx_widescreen_hack |
disabled / enabled |
| Widescreen Mode Hack Aspect Ratio | 16:10 / 16:9 ✅ / 18:9 / 19:9 / 20:9 / 21:9 / 32:9 |
beetle_psx_widescreen_hack_aspect_ratio |
16:10 / 16:9 / 18:9 / 19:9 / 20:9 / 21:9 / 32:9 |
| CPU Frequency Scaling (Overclock) | 50% / 60% / 70% / 80% / 90% / 100% (Native) ✅ / 110% / 120% / 130% / 140% / 150% / 160% / 170% / 180% / 190% / 200% / 210% / 220% / 230% / 240% / 250% / 260% / 270% / 280% / 290% / 300% / 310% / 320% / 330% / 340% / 350% / 360% / 370% / 380% / 390% / 400% / 410% / 420% / 430% / 440% / 450% / 460% / 470% / 480% / 490% / 500% / 510% / 520% / 530% / 540% / 550% / 560% / 570% / 580% / 590% / 600% / 610% / 620% / 630% / 640% / 650% / 660% / 670% / 680% / 690% / 700% / 710% / 720% / 730% / 740% / 750% |
beetle_psx_cpu_freq_scale |
50% / 60% / 70% / 80% / 90% / 100%(native) / 110% / 120% / 130% / 140% / 150% / 160% / 170% / 180% / 190% / 200% / 210% / 220% / 230% / 240% / 250% / 260% / 270% / 280% / 290% / 300% / 310% / 320% / 330% / 340% / 350% / 360% / 370% / 380% / 390% / 400% / 410% / 420% / 430% / 440% / 450% / 460% / 470% / 480% / 490% / 500% / 510% / 520% / 530% / 540% / 550% / 560% / 570% / 580% / 590% / 600% / 610% / 620% / 630% / 640% / 650% / 660% / 670% / 680% / 690% / 700% / 710% / 720% / 730% / 740% / 750% |
| GTE Overclock | Disabled ✅ / Enabled |
beetle_psx_gte_overclock |
disabled / dnabled |
| Skip BIOS | Disabled ✅ / Enabled |
beetle_psx_skip_bios |
disabled / enabled |
| Override BIOS (Restart Required) | Disabled ✅ / PSP PS1 BIOS / PS3 PS1 BIOS |
beetle_psx_override_bios |
disabled / psxonpsp / ps1_rom |
| Renderer (Restart Required) | Hardware (auto) ✅ / Hardware (OpenGL) / Hardware (Vulkan) / Software |
beetle_psx_renderer |
hardware / hardware_gl / hardware_vk / software |
| Software Framebuffer | Enabled ✅ / Disabled |
beetle_psx_renderer |
enabled / disabled |
| CPU Dynarec | Disabled (Beetle Interpreter) ✅ / Max Performance / Cycle Timing Check / Lightrec Interpreter |
beetle_psx_cpu_dynarec |
disabled / execute / execute_once / run_interpreter |
| Dynarec Code Invalidation | Full ✅ / DMA Only (Slightly Faster) |
beetle_psx_dynarec_invalidate |
full / dma |
| Dynarec DMA/GPU/MDEC/Timer Event Cycles | 128 (Default) ✅ / 256 / 384 / 512 / 640 / 768 / 896 / 1024 / 1152 / 1280 / 1408 / 1536 / 1664 / 1792 / 1920 / 2048 |
beetle_psx_dynarec_eventcycles |
128 / 256 / 384 / 512 / 640 / 768 / 896 / 1024 / 1152 / 1280 / 1408 / 1536 / 1664 / 1792 / 1920 / 2048 |
| Dynarec SPU Samples | 1 (Default) ✅ / 4 / 16 |
beetle_psx_dynarec_spu_samples |
1 / 4 / 16 |
| Core-Reported FPS Timing | Progressive Rate (Default) ✅ / Force Interlaced Rate / Allow Automatic Toggling |
beetle_psx_core_timing_fps |
force_progressive / force_interlaced / auto_toggle |
| PAL (European) Video Timing Override | Disabled ✅ / Enabled |
beetle_psx_pal_video_timing_override |
disabled / enabled |
| Crop Overscan | Enabled ✅ / Disabled |
beetle_psx_crop_overscan |
enabled / disabled |
| Additional Cropping | Disabled ✅ / 1px / 2px / 3px / 4px / 5px / 6px / 7px / 8px / 9px / 10px / 11px / 12px / 13px / 14px / 15px / 16px / 17px / 18px / 19px / 20px |
psx_image_crop |
disabled / 1px / 2px / 3px / 4px / 5px / 6px / 7px / 8px / 9px / 10px / 11px / 12px / 13px / 14px / 15px / 16px / 17px / 18px / 19px / 20px |
| Offset Cropped Image | -12px / -11px / -10px / -9px / -8px / -7px / -6px / -5px / -4px / -3px / -2px / -1px / Disabled ✅ / +1px / +2px / +3px / +4px / +5px / +6px / +7px / +8px / +9px / +10px / +11px / +12px |
psx_image_offset |
-12px / -11px / -10px / -9px / -8px / -7px / -6px / -5px / -4px / -3px / -2px / -1px / disabled / +1px / +2px / +3px / +4px / +5px / +6px / +7px / +8px / +9px / +10px / +11px / +12px |
| Horizontal Image Offset (GPU Cycles) | -40 / -39 / -38 / -37 / -36 / -35 / -34 / -33 / -32 / -31 / -30 / -29 / -28 / -27 / -26 / -25 / -24 / -23 / -22 / -21 / -20 / -19 / -18 / -17 / -16 / -15 / -14 / -13 / -12 / -11 / -10 / -9 / -8 / -7 / -6 / -5 / -4 / -3 / -2 / -1 / 0 ✅ / +1 / +2 / +3 / +4 / +5 / +6 / +7 / +8 / +9 / +10 / +11 / +12 / +13 / +14 / +15 / +16 / +17 / +18 / +19 / +20 / +21 / +22 / +23 / +24 / +25 / +26 / +27 / +28 / +29 / +30 / +31 / +32 / +33 / +34 / +35 / +36 / +37 / +38 / +39 / +40 |
beetle_psx_image_offset_cycles |
-40 / -39 / -38 / -37 / -36 / -35 / -34 / -33 / -32 / -31 / -30 / -29 / -28 / -27 / -26 / -25 / -24 / -23 / -22 / -21 / -20 / -19 / -18 / -17 / -16 / -15 / -14 / -13 / -12 / -11 / -10 / -9 / -8 / -7 / -6 / -5 / -4 / -3 / -2 / -1 / 0 / +1 / +2 / +3 / +4 / +5 / +6 / +7 / +8 / +9 / +10 / +11 / +12 / +13 / +14 / +15 / +16 / +17 / +18 / +19 / +20 / +21 / +22 / +23 / +24 / +25 / +26 / +27 / +28 / +29 / +30 / +31 / +32 / +33 / +34 / +35 / +36 / +37 / +38 / +39 / +40 |
| GPU Resterizer Overclock | 1x (Native) ✅ / 2x / 4x / 8x / 16x / 32x |
beetle_psx_gpu_overclock |
1x(native) / 2x / 4x / 8x / 16x / 32x |
| Core Aspect Ratio | Corrected ✅ / Uncorrected / Force 4:3 / Force NTSC |
beetle_psx_aspect_ratio |
corrected / uncorrected / 4:3 / ntsc |
| Initial Scan Line - NTSC | 0 ✅ / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 |
psx_initial_scanlines |
0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 |
| Last Scan Line - NTSC | 210 / 211 / 212 / 213 / 214 / 215 / 216 / 217 / 218 / 219 / 220 / 221 / 222 / 223 / 224 / 225 / 226 / 227 / 228 / 229 / 230 / 231 / 232 / 233 / 234 / 235 / 236 / 237 / 238 / 239 ✅ |
psx_last_scanlines |
210 / 211 / 212 / 213 / 214 / 215 / 216 / 217 / 218 / 219 / 220 / 221 / 222 / 223 / 224 / 225 / 226 / 227 / 228 / 229 / 230 / 231 / 232 / 233 / 234 / 235 / 236 / 237 / 238 / 239 |
| Initial Scan Line - PAL | 0 ✅ / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 |
beetle_psx_initial_scanline_pal |
0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 / 11 / 12 / 13 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36 / 37 / 38 / 39 / 40 |
| Last Scan Line - PAL | 230 / 231 / 232 / 233 / 234 / 235 / 236 / 237 / 238 / 239 / 240 / 241 / 242 / 243 / 244 / 245 / 246 / 247 / 248 / 249 / 250 / 251 / 252 / 253 / 254 / 255 / 256 / 257 / 258 / 259 / 260 / 261 / 262 / 263 / 264 / 265 / 266 / 267 / 268 / 269 / 270 / 271 / 272 / 273 / 274 / 275 / 276 / 277 / 278 / 279 / 280 / 281 / 282 / 283 / 284 / 285 / 286 / 287 ✅ |
beetle_psx_last_scanline_pal |
230 / 231 / 232 / 233 / 234 / 235 / 236 / 237 / 238 / 239 / 240 / 241 / 242 / 243 / 244 / 245 / 246 / 247 / 248 / 249 / 250 / 251 / 252 / 253 / 254 / 255 / 256 / 257 / 258 / 259 / 260 / 261 / 262 / 263 / 264 / 265 / 266 / 267 / 268 / 269 / 270 / 271 / 272 / 273 / 274 / 275 / 276 / 277 / 278 / 279 / 280 / 281 / 282 / 283 / 284 / 285 / 286 / 287 |
| CD Access Method (Restart Required) | Synchronous ✅ / Asynchronous / Pre-Cache |
beetle_psx_cd_access_method |
sync / async / precache |
| CD Loading Speed | 2x (Native) ✅ / 4x / 6x / 8x / 10x / 12x / 14x |
beetle_psx_cd_fastload |
2x(native) / 4x / 6x / 8x / 10x / 12x / 14x |
¶ 
External links
- Source code used: https://github.com/libretro/beetle-psx-libretro/
- Libretro documentation: https://docs.libretro.com/library/beetle_psx/