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|generation = Z80-based home computers
→Emulators
|developer = Sinclair Research
|type = [[:Category:Computers|Computers]]
|release = 1981
|discontinued = 1984
|predecessor = Sinclair ZX80
|successor = [[ZX Spectrum line|ZX Spectrum]]
|emulated = {{✓}}
The ZX81 was designed to be small, simple, and above all cheap, using as few components as possible to keep the cost down.
Video output was to a television set rather than a dedicated monitor. Programs and data were loaded and saved onto audio tape cassettes. It had only four silicon logic chips on board and a mere 1 KB of memory. The machine had no power switch or any moving parts and used a pressure-sensitive membrane keyboard for manual input.
Its distinctive design brought its designer, Rick Dickinson, a Design Council award.
==Emulators==
<div style="max-width:100%; overflow:auto;">
{| class="wikitable" style="text-align:center;"
! scope="col"|Name
| {{✓}}
|-
| [[EightyOne]](81)
| align=left|{{Icon|Windows}}
| [https://sourceforge.net/projects/eightyone-sinclair-emulator/files/ {{EightyOneVer}}]
| {{✓}}
| 114100.30%
| {{✓}}
| {{✓}}
| [http://zx81.vb81.free.fr VB81 XuR]
| align=left|{{Icon|Windows}}
| [http://zx81.vb81.free.fr/download/VB81_XuR_EXE.zip 2113/0508/2022]
| {{✗}}
| 100.5%
| [https://zx81-ios.weebly.com ZX81 iOS]
| align=left|{{Icon|iOS}}
| [https://itunes.apple.com/us/app/zx81/id1180117434?mt=8 1.1112.10]
| {{✗}}
| 100.10% <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>
| ?
| {{✓}}
| {{~}} <br/><ref group=N name=ZX81iOSNeutered>This app is neutered as loading of external programs into emulator apps from the App Store is prohibited by Apple. However, it does have a growing selection of programs included with permission granted by their authors.</ref>
|-
! colspan="8"|Consoles
|-
| DS81
| align=left|{{icon|NDS}}
| [https://www.gamebrew.org/wiki/DS81 1.3]
| {{✗}}
| Not tested
| {{✓}}
| {{✗}}
| {{✓}}
|}
</div>
<references group=N />
* [http://zx81.eu5.org/emulators.htm zx81.eu5.org] (Brazilian ZX81 fan-site - emulators list page is in English. Shows list of old ZX81 emulators & links to other resources.)
* [http://floppydays.libsyn.com/floppy-days-86-the-sinclair-zx80-part-ii-with-earl-evans floppydays.libsyn.com] (Podcast episode describing the emulators available for the ZX80 / ZX81 which also uses the Carlo Delhez's clkfreq rating. Also has huge lists of resources for all things ZX80/81 related.)
* [http://www.robotsandcomputers.com/computers/manuals/zx81_sch.jpg] (Schematic) There was also an ASTEC RF modulator and a voltage regulator.
[[Category:Computers]]
[[Category:ZX81 emulators|*]]
[[Category:Z80-based]]
