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! scope="col"|ZX80
! scope="col"|ZX81
! scope="col"|Relative Speed<ref>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>
|114.3%
{{reflist}}<references group=N /> ==Notes== * [http://www.retroisle.com/sinclair/zx81/emulators.php www.retroisle.com] (Page showing five old emulators for ZX81, and sometimes the Spectrum and other machines)* [https://www.worldofspectrum.org/faq/emulators/other.htm www.worldofspectrum.org's list] (Short list of old Science of Cambridge MK-14, ZX80, ZX81 / TS1000, Sinclair QL and Jupiter ACE emulators)* [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.)
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The '''[[wikipedia:ZX81|ZX81]]''' was a Z80-based home computer produced by Sinclair Research and manufactured in Scotland by Timex Corporationreleased 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 emulators|ZX Spectrum]] and was hugely successful, and more than 1.5 million units were sold before it was discontinued.
==Emulators==
{| class="wikitable" style="text-align:center;"
|-
! scope="col"|Name
! scope="col"|Operating SystemPlatform(s)
! scope="col"|Latest Version
! scope="col"|[[libretro|Libretro Core]]
! scope="col"|<abbr title="Free/Libre and Open-Source Software">FLOSS</abbr>
! 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"|Active
! scope="col"|[[Recommended Emulators|Recommended]]
|-
! colspan="8"|PC / x86|-|[[EightyOneClock Signal|CLK]]|Windowsalign=left|{{Icon|Linux|macOS|FreeBSD}}|[https://sourceforgegithub.netcom/projectsTomHarte/eightyone-sinclair-emulatorCLK/files/ 1releases {{clkver}}]|{{✗}}|{{✓}}|100.12]0%
|{{✓}}
|{{✓}}
|-
|[[ZEsarUX]]
|align=left|{{Icon|Windows|Linux|macOS|FreeBSD}}
|[https://github.com/chernandezba/zesarux/releases {{ZEsarUXVer}}]
|{{✗}}
|{{✓}}
|110.9%
|{{✓}}
|{{✓}}
|-
|ZEsarUX[[EightyOne]]|Multi-platformalign=left|{{Icon|Windows}}|[https://githubsourceforge.comnet/chernandezbaprojects/zesaruxeightyone-sinclair-emulator/files/releases 7.1{{EightyOneVer}}]
|{{✓}}
|{{✓}}
|114.3%
|{{✓}}
|{{✓}}
|-
|Spud81
|align=left|{{Icon|Windows}}
|[https://1drv.ms/u/s!Ar4VkKtk_3JzgQFkPzv4WgWTMHNc?e=trhIHh 0.221]
|{{✗}}
|?
|114.9%
|{{✓}}
|110{{~}}|-|[https://sourceforge.9%net/projects/sz81/ SZ81] <br/><small>(xz80 & z81 based)</small>|align=left|{{Icon|Windows|Linux|macOS|FreeBSD|AmigaOS}}|[http://sz81.sourceforge.net/#downloads 2.1.7] <br/>[http://rullf2.xs4all.nl/sz81/ 2.3.10 (Unofficial)]|{{✗}}
|{{✓}}
|100.0%
|{{✗}}
|{{~}}
|-
|[[Clock Signal|CLKMAME]]|align=left|{{Icon|Windows|Linux|macOS and UNIXalikes|FreeBSD}}|[httpshttp://githubwww.mamedev.comorg/TomHarte/CLK/releases release.html {{clkverMAMEVer}}]
|{{✓}}
|?
|Not tested
|{{✓}}
|{{✗}}
|-
|[http://zxplanet.emuunlim.com/mme-review.htm MTMW] <br/><small>(aka 'MulTiMachine')</small>
|align=left|{{Icon|Windows}}
|[https://www.zophar.net/sinclair/multi-machine.html 1.30b]
|{{✗}}
|?
|Not tested
|{{✗}}
|{{✗}}
|-
|[[No$|No$ZX]]
|align=left|{{Icon|Windows|DOS}}
|[http://problemkaputt.de/zx.htm 2.0]
|{{✗}}
|{{✗}}
|100.1% <br/><ref group=N name=NoCashSpeed>After turning off the simulated hardware improvements that were not standard in the original computer.</ref>
|{{✗}}
|{{✗}}
|-
|[http://freestuff.grok.co.uk/vb81/ VB81]
|align=left|{{Icon|Windows}}
|[http://zx81.vb81.free.fr/vb81/download/vb81-full.exe 1.30]
|{{✗}}
|{{✓}}
|100.0%Not tested|{{✗}}
|{{✗}}
|-
|SZ81[http://zx81.vb81.free.fr VB81 XuR]|UNIX, align=left|{{Icon|Windows, [[Amiga emulators|Amiga]]}}|[http://sz81zx81.sourceforgevb81.netfree.fr/ 2download/VB81_XuR_EXE.zip 1.730.3 (26/11/2019)]|{{✗}}
|?
|100.5%
|{{✓}}
|{{✗}}
|-
|[http://zxplanet.emuunlim.com/xtender-review.htm XTender2]
|align=left|{{Icon|DOS}}
|[http://www.zx81.nl/ beta 13]
|{{✗}}
|?
|Not tested
|{{✗}}
|{{✗}}
|-
|[http://www.retroisle.com/sinclair/zx81/emulators.php ZX81 Emulator] <br/><small>(Paul Robson)</small>
|align=left|{{Icon|DOS}}
|[http://www.zx81.nl/ 4.00]
|{{✗}}
|?
|101.5%
|{{✗}}
|{{✗}}
|-
! colspan="8"|Mobile / ARM
|-
|[https://sourceforge.net/projects/sz81/ SZ81] <br/><small>(xz80 & z81 based)</small>
|align=left|{{Icon|Zaurus|Dingoo|Wiz}}
|[http://sz81.sourceforge.net/#downloads 2.1.7]
|{{✗}}
|{{✓}}
|100.0%
|{{✗}}
|{{✗}}
|-
|[[MAME]https://zx81-ios.weebly.com ZX81 iOS]|Multi-platformalign=left|{{Icon|iOS}}|[httphttps://wwwitunes.mamedevapple.orgcom/us/app/releasezx81/id1180117434?mt=8 1.html 10.0]|{{MAMEVer✗}}]|?
|?
|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>
|{{✓}}
|{{✓}}|Not tested|{{✗~}}<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>
|}
[[Category:Computers]]
