| Matthew's ZX81 Homepage: Software library, reviews, news, emulators for various platforms. |
| Obsolete Computer Museum's ZX-81 Page: Technical specifications and pictures of the Sinclair ZX81 with comments from other ZX81 owners. |
| Project 81: Aims to preserve ZX81 related documents in digital form. |
| Rodney Knaap: Build your own ZX81: ZX81 hardware website featuring a project for building your own ZX81 with discrete components as well as Wilf Rigter's ZX97. In English, Dutch and German. |
| Sinclair ZX-81 back from the dead: Tony Smith writes about the availability of ZX81 DIY kits. |
| Sinclair ZX81 Benchtest: Article from Personal Computer World by David Tebbutt. |
| Sinclair ZX81 Collection: Collection of original Sinclair ZX81 hardware, software and literature. Photos and description for each item. |
| Sinclair ZX81 FAQ: Some common questions about the ZX81. |
| Steven's ZX81 Computer: Links and information from an enthusiast. |
| System Variables of the Sinclair ZX81: Memory map of the RAM reserved by the system. |
| The ZX97 by Wilf Rigter: A project to design and build an enhanced, low power discrete logic version of the ZX81. |
| Zebra Systems, Inc.: Timex-Sinclair ZX81 computer kits for sale. |
| ZX-TEAM: An active German Sinclair ZX81 users' group. Site offers information about the Sinclair machines and the group's activities, including news of forthcoming events, nn English and German. |
| ZX80 hardware page: How to build your own ZX80 and ZX81. |
| ZX81 'Caverns' Game - PC Remake: Author of the original 1980's 'Caverns' game offers a PC remake for download. Includes game history and instructions. |
| ZX81 - Planet Sinclair: Information, photos and resources for the Sinclair ZX80, including a detailed account of its development extracted from Ian Adamson and Richard Kennedy's book "Sinclair and the Sunrise Technology". |
| ZX81 Download Page: A ZX81 software archive. |
| ZX81 Forever: Pictures, newsletters and programs made with the ZX81, a 16kb rampack and a Timex 2040 printer. Updated monthly. |
| ZX81 Home Page: A ZX81 FAQ, emulator and software links. |
| ZX81 kit: UK based sales and support of ZX81 computers in kit form, also related peripherals and books. |
| ZX81 Stuff: Collection of ZX81-related documentation plus hardware and software projects. |
| ZX81 Virtual Community: Contains links, a scanned copy of the ZX81 manual as well as ZXTAPE, a DOS-based utility to transfer ZX81 software from a PC to a ZX81 or tape recorder, and to transfer ZX81 software from tape back to PC. |
| ZX81Kit .Com: A European supplier of the Sinclair ZX81 computer in kit form. Also contains useful information and links, and other ZX81 hardware is available. |
Classical
