![sinclair zx81 emulator windows sinclair zx81 emulator windows](https://www.aptanet.org/eightyone/images/pic3.gif)
However, it does have a growing selection of programs included with permission granted by their authors. ↑ This app is neutered as loading of external programs into emulator apps from the App Store is prohibited by Apple.Permission to include clkfreq in the app cannot be granted because Dr Delhez sadly passed away in 2015. ↑ 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.↑ After turning off the simulated hardware improvements that were not standard in the original computer.100.0% denotes the same execution speed as a real machine. 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. ↑ As calculated by Carlo Delhez's clkfreq, originally distributed with his XTender emulator.The ZX81's commercial success made Sinclair Research one of Britain's leading computer manufacturers and earned a fortune and an eventual knighthood for the company's founder, Sir Clive Sinclair. The ZX81 marked the first time that computing in Britain became an activity for the general public, rather than the preserve of businesspeople and electronics hobbyists. It was the first cheap mass-market home computer that could be bought from high street stores, led by W.H. The ZX81 could be bought by mail order in kit form or pre-assembled. Its distinctive design brought its designer, Rick Dickinson, a Design Council award.
SINCLAIR ZX81 EMULATOR WINDOWS MANUAL
The machine had no power switch or any moving parts and used a pressure-sensitive membrane keyboard for manual input.
![sinclair zx81 emulator windows sinclair zx81 emulator windows](https://static.emulatorgames.net/images/sinclair-zx81/eightyone.gif)
It had only four silicon chips on board and a mere 1 KB of memory. Programs and data were loaded and saved onto audio tape cassettes. Video output was to a television set rather than a dedicated monitor. The ZX81 was designed to be small, simple, and above all cheap, using as few components as possible to keep the cost down. It was the successor to Sinclair's ZX80 and the predecessor of the ZX Spectrum and was hugely successful, and more than 1.5 million units were sold before it was discontinued.
![sinclair zx81 emulator windows sinclair zx81 emulator windows](http://zx81.eu5.org/imagens/emul/zx81.jpg)
It had a Z80 at 3.25 MHz with 1KB of RAM. The 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 $99.95.