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|discontinued = 1984
|predecessor = Sinclair ZX80
|successor = [[ZX Spectrum Lineline|ZX Spectrum]]
|emulated = {{✓}}
}}
The '''[[wikipedia:ZX81|ZX81]]''' was a Z80-based home computer produced by Sinclair Research and manufactured in Scotland by Timex Corporation released on March 5, 1981, and had a retail price of {{Inflation|USD|99.95| 1981}}. It had a Z80 at 3.25 MHz with 1KB of RAM.
It was the successor to Sinclair's ZX80 and the predecessor of the [[ZX Spectrum emulatorsline|ZX Spectrum]] and was hugely successful, and more than 1.5 million units were sold before it was discontinued.
The ZX81 was designed to be small, simple, and above all cheap, using as few components as possible to keep the cost down.
==Emulators==
{| class="wikitable" style="text-align:center;"
! scope="col"|Name
! scope="col"|Platform(s)
! scope="col"|Latest Version
! scope="col"| [[libretro|Libretro Core]]
! scope="col"|Relative Speed<ref group=N name=RelativeSpeed>As calculated by Carlo Delhez's clkfreq, originally distributed with his XTender emulator. The ZX81 has relatively complicated timing mechanics, depending on signalling of WAIT during NMI; relative speed is a measurement of how closely an emulator matches a real machine in terms of clock cycles spent processing within a frame. 100.0% denotes the same execution speed as a real machine.</ref>
! scope="col"|<abbr title="Free/Libre and Open-Source Software">FLOSS</abbr>
! scope="col"|Active
! scope="col"| [[Recommended Emulatorsemulators|Recommended]]
|-
! colspan="8"|PC / x86
| [[Clock Signal|CLK]]
| align=left|{{Icon|Linux|macOS|FreeBSD}}
| [https://github.com/TomHarte/CLK/releases {{clkverclkVer}}]
| {{✗}}
| 100.0%
| 114.9%
| {{✗}}
| {{✓✗}}
| {{~}}
|-
| [http://zx81.vb81.free.fr VB81 XuR]
| align=left|{{Icon|Windows}}
| [http://zx81.vb81.free.fr/download/VB81_XuR_EXE.zip 0321/1005/20212022]
| {{✗}}
| 100.5%
| [https://zx81-ios.weebly.com ZX81 iOS]
| align=left|{{Icon|iOS}}
| [https://itunes.apple.com/us/app/zx81/id1180117434?mt=8 1.1011.01]
| {{✗}}
| 100.1% <br/><ref group=N name=ZX81iOSSpeed>Provided by Kevin Palser the developer (and author of this note) because the app cannot load external programs, such as Carlo Delhez's clkfreq, due to Apple developer restrictions for iOS. Permission to include clkfreq in the app cannot be granted because Dr Delhez sadly passed away in 2015.</ref>
