The following table provides a comparison between the capabilities of the ZX81 and various other competing microcomputers that were available in June 1981, about the time that the first ZX81 …

The Sinclair ZX81, developed by Sinclair Research and manufactured by Timex Corporation in Dundee, Scotland, was the first home computer sold in the United States for under $150.

The ZX81 has the same microprocessor and runs at the same speed as the ZX80, but it has a better BASIC programming language and is cheaper to produce, due to having fewer chips and a simpler …

Mar 3, 2025 · EightyOne is an emulator for the range of ZX home computers made by Sinclair Research (and their clones) in the 1980s, primarily the ZX80 and ZX81 but also includes the ZX Spectrum …

Aug 12, 2025 · The ZX81 +38 is a modernized reconstruction of the 1981 Sinclair ZX81, combining retro aesthetics with practical upgrades for enhanced usability and reliability.

The ZX81 ROM was 8 KB in size (double that of the ZX80), and contained an updated BASIC interpreter complete with floating-point and trigonometric capability, plus new commands to communicate with …

Aug 6, 2024 · Like most almost every home computer of the era, the ZX81 launches directly into BASIC, and its particular flavour is somewhat idiosyncratic. It’s based on a “keyword system”, where BASIC …

Mar 20, 2025 · The ZX81, released by Sinclair Research in 1981, was a groundbreaking home computer that played a significant role in popularizing personal computing. It was the successor to the popular …

Jul 5, 2021 · I recently got my hands on my first Sinclair ZX81, yet another 1980s 8-bit computer to add to my collection. The machine was in very good physical condition and came with several …

In modern terms it was one of the first "plug and play" computers. By today's standards the ZX81 is laughably primitive: only 1K of memory, no colour or sound and a notably unresponsive touch …