systems:zx81 [Batocera.linux

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====== ZX81 ======

The ZX81 is a computer developed by Sinclair. It was released in 1981, retailing for $99.95 USD ($302 in 2021).

The ZX81 was designed as the low-cost successor to the ZX80, accessible to the general public. It was a huge success.

This system scrapes metadata for the "zx81" group and loads the ''zx81'' set from the currently selected theme, if available.
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==== Quick reference ====

  * **Emulator:** [[#retroarch|RetroArch]]
  * **Core:** [[#libretro:_81|libretro: 81]]
  * **Folder:** ''/userdata/roms/zx81''
  * **Accepted ROM formats:** ''.tzx'', ''.p'', ''.zip'', ''.7z''

===== BIOS =====

No ZX81 emulator in Batocera needs a BIOS file to run.

===== ROMs =====

Place your ZX81 ROMs in ''/userdata/roms/zx81''.

To enable gamepad support, open RetroArch's **Quick Menu** with ''[HOTKEY]'' + {{:wiki:south.png?nolink&20|South button (B SNES)}}, then **Settings** -> **Input** -> **Input User 1 Binds** and change **User 1 Device type: Retropad** to "Cursor Joystick".

===== Emulators =====

==== RetroArch ====

[[https://docs.libretro.com/|RetroArch]] (formerly SSNES), is a ubiquitous frontend that can run multiple "cores", which are essentially the emulators themselves. The most common cores use the [[https://www.libretro.com/|libretro]] API, so that's why cores run in RetroArch in Batocera are referred to as "libretro: (core name)". RetroArch aims to unify the feature set of all libretro cores and offer a universal, familiar interface independent of platform.

=== RetroArch configuration ===

RetroArch offers a **Quick Menu** accessed by pressing ''[HOTKEY]'' + {{:wiki:south.png?nolink&20|South button (B SNES)}} which can be used to alter various things like [[:advanced_retroarch_settings|RetroArch and core options]], and [[:remapping_controls_per_emulator|controller mapping]]. Most RetroArch related settings can be altered from Batocera's EmulationStation.

Standardized features available to all libretro cores: ''zx81.videomode'', ''zx81.ratio'', ''zx81.smooth'', ''zx81.shaders'', ''zx81.pixel_perfect'', ''zx81.decoration'', ''zx81.game_translation''

^ ES setting name ''batocera.conf_key'' ^ Description => ES option ''key_value'' ^
^ Settings that apply to all cores of this emulator ||
| **GRAPHICS API ''zx81.gfxbackend''** | Choose which graphics API library to use. Vulkan is better, when supported.\\ => OpenGL ''opengl'', Vulkan ''vulkan''. |
| **AUDIO LATENCY ''zx81.audio_latency''** | In milliseconds. Can reduce crackling/cutting out.\\ => 256 ''256'', 192 ''192'', 128 ''128'', 64 ''64'', 32 ''32'', 16 ''16'', 8 ''8''. |
| **THREADED VIDEO ''zx81.video_threaded''** | Improves performance at the cost of latency and more video stuttering. Use only if full speed cannot be obtained otherwise.\\ => On ''true'', Off ''false''. |

=== libretro: 81 ===

**The** ZX81 emulator, also capable of emulating ZX80, ZX Spectrum, Sinclair Spectrum, Jupiter ACE, Timex TS1000, TS1500, TS2068, TC2048, Lambda 8300, Ringo R470 and MicroDigital TK85.

== libretro: 81 configuration ==

^ ES setting name ''batocera.conf_key'' ^ Description => ES option ''key_value'' ^
^ Settings that apply to all systems this core supports ||
| **COLORIZATION ''global.81_chroma_81''** | This checks if the Chroma 81 expansion is installed, and if so, loads a program prior to the loading of the program. This allows for color to be added to the program, which will remain otherwise blissfully unaware that it's running with colors. Emulate Chroma 81 interface (colorization).\\ => Autodetect ''automatic'', Off ''disabled'', On (forced) ''enabled''. |
| **WRX HIGH RESOLUTION ''global.81_highres''** | On the original ZX81, it was possible to do some hardware modifications to use a higher video resolution. It requires both the display and the game to support the higher resolution. Required for some homebrew.\\ => Autodetect ''automatic'', Off ''none'', On (forced) ''WRX''. |

===== Controls =====

Here are the default ZX81's controls shown on a [[:configure_a_controller|Batocera Retropad]]:

{{https://raw.githubusercontent.com/batocera-linux/batocera-controller-overlays/master/solid-4k/zx81.png}}

===== Troubleshooting =====

==== Further troubleshooting ====

For further troubleshooting, refer to the [[:support|generic support pages]].