¶ 
License
This core is under GPLv3 license.
¶ 
Compatibility
| RPI0/RPI1 | RPI3 | RPI4/RPI400 | RPI5 | ODROID XU4 | OGA/OGS/RG351 | PC | RG353 |
|---|---|---|---|---|---|---|---|
| ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
¶ 
Features
| Feature | Supported |
|---|---|
| Restart | ✔ |
| Screenshots | ✔ |
| States | ✔ |
| Rewind | ✔ |
| Netplay | ✔ |
| Core Options | ✔ |
| Controls | ✔ |
¶ 
BIOS
No bios is required.
¶ 
Roms
¶ Supported extensions
Roms must have the extension:
- .tzx
- .t81
- .p
- .zip
- .7z
This system supports compressed roms in .zip/.7z format. However, be careful, it is only an archive.
The files contained in the .zip/.7z must correspond to the extensions mentioned above.
Moreover, each .zip/.7z file must contain only one compressed rom.
¶ Location
Put the roms like this:
┣ 📁 recalbox
┃ ┣ 📁 share
┃ ┃ ┣ 📁 roms
┃ ┃ ┃ ┣ 📁 zx81
┃ ┃ ┃ ┃ ┣ 🗒 game.zip
The roms using TOSEC format are highly recommended.
For more information about roms, 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 |
|---|---|---|---|
| Tape Fast Load | Enabled ✅ / Disabled |
81_fast_load |
enabled / disabled |
| 8K-16K Contents | auto ✅ / ROM shadow / RAM / dK'tronics 4K Graphics ROM + 4K RAM |
81_8_16_contents |
auto / ROM shadow / RAM / dK'tronics 4K Graphics ROM + 4K RAM |
| Size Video Border | normal ✅ / small / none |
81_border_size |
normal / small / none |
| High Resolution | auto ✅ / none / WRX |
81_highres |
auto / none / WRX |
| Emulate Chroma 81 | auto ✅ / Disabled / Enabled |
81_chroma_81 |
auto / disabled / enabled |
| Video Presets | clean ✅ / tv / noisy |
81_video_presets |
clean / tv / noisy |
| Sound emulation | auto ✅ / none / Zon X-81 |
81_sound |
auto / none / Zon X-81 |
| Joypad Left mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_left |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad Right mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_right |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad Up mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_up |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad Down mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_down |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad A button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_a |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad B button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_b |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad X button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_x |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad Y button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_y |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad L button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_l |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad R button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_r |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad L2 button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_l2 |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Joypad R2 button mapping | auto ✅ / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
81_joypad_r2 |
auto / default / new line / shift / space / . / 0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / a / b / c / d / e / f / g / h / i / j / k / l / m / n / o / p / q / r / s / t / u / v / w / x / y / z |
| Transparent Keyboard Overlay | Enabled ✅ / Disabled |
81_keybovl_transp |
enabled / disabled |
| Time to Release Key in ms | 100 ✅ / 300 / 500 / 1000 |
81_key_hold_time |
100 / 300 / 500 / 1000 |
¶ 
External links
- Source code used: https://github.com/libretro/81-libretro/
- Libretro documentation: https://docs.libretro.com/library/eightyone/