Sinclair zx81 schematic software

The sinclair zx81 was released 1981 in the uk and later in 1982 in a slightly modified form as the timex sinclair in the united states. Ts a zx81 clone, distributed in usa by a company called timex. It needs a sinclair zx81 or emulator equipped with 32k ram you need to enter the commands. Multimachine emulates a whole range of 8 bit machines.

Zx spectrum hardware do it yourself, maintained by pera putnik. You have access to a range of 8 colours for the foreground, background and border, together with a sound generator and highresolution graphics. It was very similar to zx81, it only contained more ram 2k and had ntsc tv modulator with switch allowing to switch between channel 2 and 3. User selectable memory mapping allows the zx97l to boot directly from user mc code in ram. As a user you agree to any information you have entered to. In case it disappears from the internet, here is a.

March sinclair unveils the zx81 in the uk, based on the z80a microprocessor. The timex 1016 16k ram pack schematics for the zx81 or ts the ql. Click here to navigate to the timexsinclair section, which contains the timexsinclair specific documents other peripheral manufacturers. Minesweeper for your zx81 will also run under zx81emulator xtender. Includes 2 kbytes ram, and obviously 60hz ntsc tv modulator, otherwise same as zx81. The company was later to produce its own licensed clones and variants of the zx81. Tzx, which is in fact a spectrums format but still suitable to zx81 and pfile which contains binary program or basic one, but. Discussion forums for users of the sinclair range of computers zx80, zx81, zx spectrum, their clones and cambridge z88. The ip address of all posts are recorded to aid in enforcing these conditions. For those not aware of his work, rick was behind the design of multiple sinclair machines including the zx80, zx81, zx spectrum and sinclair ql. Dead timex sinclair help classic computing atariage. Minesweeper for your zx81 will also run under zx81 emulator xtender. Timex sinclair sold the zx81 in the united states as the ts.

Afterwards i got many comments that for a kit it was too difficult to build due to the use of smt. But its new 16k basic rom dramatically increases your computing power. The zx81 is a home computer that was produced by sinclair research and manufactured in dundee, scotland, by timex corporation. It was launched in the united kingdom in march 1981 as the successor to sinclair s zx80 and designed to be a lowcost introduction to home computing for the general public. Sinclair zx81 issue one computer computing history. In this project we will build a sinclair zx80 clone with 16kbyte of ram and a 16kbyte eprom with dual zx80 and zx81 rom images which can be switched by selector links. The zx97l is a complete zx81 using discrete logic chips with 32k of battery backup ram and 32k of eprom. The timex 1016 16k ram pack schematics for the zx81 or ts the ql users guide.

Collection of articles and tips for zx81 19811986 showing 18 of 8 messages. Discussion about zx80 zx81 software 181 topics 1700 posts last post re. The sinclair zx81 support page has been restructured and a new site layoutrevealed. Having one to physically have it is one thing but if you actually want the experience of using one, the next best thing.

Please note that the system is completely self contained and this means you cannot remotely add code, more games etc. Starting the sinclair zx81 keyboard adventure by david stephenson 04 september arduino, hardware, keyboard, project, raspberry pi, sinclair, zx spectrum, zx81 leave a comment after stumbling on elite systems recreated spectrum recently, i got to thinking why not do something similar for the zx81. Inside, casing was shielded better by using metal coating. Chapter 1 setting up the zx81 unpack the zx81, you will have found 1. The sinclair zx81 character display generator consists of the z80, rom, ram and the larger part of the zx81 sinclair logic chip usually called the ula as shown in fig 2 with all relevant connections including the isolation resistors r. It was launched in the united kingdom in march 1981 as the successor to sinclairs zx80 and designed to be a lowcost introduction to home computing for the general public. Due in part to the inertia behind discussions on the sinclair zx80 and zx81 discussion forums, various items of software have been released for the sinclair zx81 over the past few years, utilising the best tools on pcs in order to create imaginative software, which is up to or exceeeds the standard of previous commercial releases. The programmers were john grant, the owner of nine tiles, and steve vickers it was initially an incomplete implementation of the 1978 american national standards institute ansi minimal basic standard with integer arithmetic only, termed the 4k basic for its rom size for the zx80. He had ambitions to use it, in his words, to control th.

The zx80 with zx81 basic, on the other hand is compatible with the zx81. Keyboards and keyboard accessories for the zx81 and ts. Zx81 emulator written in visual basic can you believe it windows. New zx80 cases by erm view the latest post sun may 10, 2020. Jan 09, 2017 the ts is prone to burnt, just leaving it on for a while without enough ventilation would fry the logic array chip. Zx81 collection, the largest online collection of sinclair zx81 and ts games, software, books and hardware. I used to buy these from fleas markets and got two nonworking, i had to order one from ebay marked as fully functional, but if i leave it enough time the screen starts showing trash and i better turn off it before it burns also. We will use the zx80 minstrel pcb from tynemouth software for this project uk. The zx97lite is a simplified zx97 designed to fit on one single sided pcb. Sinclair zx81 issue one the zx81 was launched on march 5th 1981 by clive sinclair. The technical schematic diagram of the sinclair 16k ram pack. The bare unit comes with four wires which need attaching to your zx81.

Desktop sinclair zx spectrum service manual 59 pages desktop sinclair zx spectrum manual. Sinclair zx80 zx81 forums user control panel register. Timexsinclair sold the zx81 in the united states as the ts. Feb 23, 2011 in 1981, sinclair research released the zx81 as a followup to their earlier zx80. It displays an onscreen keyboard to make it easy to use the clever onekeypercommand basic programming. The main page had been growing far too big and was taking a while to downloadas a result. The sinclair 16k ram pack gives the computer sixteen times as much memory as it has in its unexpanded form. Sinclair zx81 basic programming by steven vickers second. Apr 11, 2017 tynemouth software llp old computers, new computers, bespoke web design and software development, computer repairs, it and media services uk tuesday, 11 april 2017 minstrel zx80 clone and the zxpand. In february 1982 timex obtained a licence from sinclair to sell the zx81 directly through thousands of retail outlets in the us, paying sinclair research a 5 per cent royalty on all sinclair hardware and software sold by timex. Here is the schematic plus board layout of the keyboard. In place of a dedicated monitor, the zx81 was designed to output video to standard television set. It was a marvel at the time, only problem is they ran hot and eventually failed, and you cant easily get replacements.

Every piece of spectrum hardware ever built can be found here. First of all, you will need to open up your zx81 case and remove the top with the zx81 upside down, so that the expansion port is in the top left hand corner, there are two screw holes visible top centre and to the right near the ear socket. Sinclair zx81spectrum for sinclair zx81spectrum gamefaqs. Giant letters utility by xavsnap view the latest post sun apr 26, 2020 8. After loading a zx80 program, the zx81 will be in fast mode. December sinclair research reports that it has shipped 250,000 zx81 personal computers 1982. You agree that sinclair zx80 zx81 forums have the right to remove, edit, move or close any topic at any time should we see fit. The crystal frog by gus this is an excellent text only adventure, written for the quill adventure writer, which has now been ported across from the sinclair zx spectrum version by kerian uk limited. Some background information on the ula and links to some sites that have replaced it with discrete components. The inner working are now well understood and well documented, thanks to the work of various sinclair fans. The zx spectrum contains all the proven features of the zx81. I also needed to plan for the future and bring about some order to this site. The 8k zx81 rom bundled with a zx81style keyboard overlay but still lacking the nmigenerator. The zx81 was manufactured by the timex corporation and sold as a kit.

A view of all the component parts that make up the zx81 replacing the zx81 s ula. There are now over 600 different zx81 software titles listed, which you can run. Grant concentrated on the software that drove the zx81s hardware, while vickers developed the new basic and the accompanying manual. Primary designed to had new functionalities in vb81 screen shot and zx81 programmers tools. Probably the best drawing package we have seen and sadly missing in the early. There are also some zx81 book cover scans, and some hardware photos and manual scans, including the the dktronics 4k graphics rom, complete with a dump of the rom, circuit diagram and fitting instructions, and a description of the ts1500 composite video modification. Afterwards i got many comments that for a kit it was too difficult to build due to the use of. A great addon for a zx81 which allows you to easily load files from an sd card. As a user you agree to any information you have entered to being stored in a database.

The zx81 was never designed to make use of a file system and this should make finding the file you want much easier. Emulating a zx81 in july 2011 i discovered eightyone, a quite comprehensive and functional emulator for a wide variety of old sinclair computers, including the zx81. The keyboard layout is based around the 8x5 matrix format found on the sinclair zx81 and zx spectrums, which makes sense as thats what its designed to be used with. The ts was my first computer, so it holds a special place in my heart. This app focuses on the sinclair zx81 experience and is loaded with example software. February sinclair research announces the zx80 computer in the north american market 1981.

Authorised software downloads for the sinclair zx81 home computer. The motivation for this implementation of the zx81 basic dialect is an article in 1 by david brin that describing the lack of a simple and fun to use programming language that can suit the needs of young children without forcing them to delve into. The zx81 basic programming manual, also available in pdf format. Sort of an experimental unfinished zx81 emulator windows. Clever software was later written to load and save from tape at. Original documents written by thirdparty manufacturers of sinclair peripherals. Nov 21, 2016 in the early 1980s when the 8bit microcomputer boom was well under way, alan faulds was a student, and an owner of a sinclair zx81. The result is the new site menu showing all the sub pages available from here.

The paragraph from the zx81 manual quoted at the start of this page is my. Zx81 collection, the largest online collection of sinclair zx81 and ts. Designed as a lowcost introduction to home computing, the zx81 was designed to be small, simple, and cheap. The spectrum hardware page, maintained by paul jenkinson and also completely integrated in the sinclair infoseek database. In the early 1980s when the 8bit microcomputer boom was well under way, alan faulds was a student, and an owner of a sinclair zx81. Tynemouth software llp old computers, new computers, bespoke web design and software development, computer repairs, it and media services uk.

Sinclair basic was originally developed in 1979 for the zx80 by nine tiles. Minesweeper is written by zxteammember bodo in pure basic. This is the complete circuit with the 8 pin row connector and 5 pin header connector. Aug 21, 20 the zx81 ula also added some extra functionality over the zx80, so its even more chips to replace. The zx81 ula also added some extra functionality over the zx80, so its even more chips to replace. For the points issues you listed for consideration, many of them have perfectly reasonable and arguably better solutions when simply considering that async initialization logic is trivially handled by the user code and not by the module resolution infrastructure. Ram packs and memory expansion for the zx81 and ts. Config zxpand manual config config x config xy press shiftg in k mode replaces llist command the config command is the main method of communicating with and configuring the zxpand interface. Download software for zx81 and emulator here i will present some nice software for your zx81 which is written by zxteam members and cannot be found in other sites. It also has 32k of ram, the option to add a joystick and on. One year later, they released the new and improved zx81. Sync magazine was a relatively shortlived glossy magazine dedicated to the timex sinclair zx80 zx81 models of computers.

He also designed the cambridge z88 after leaving sinclair research and setting up his own company dickinson associates back in 1986 and has continued in the industry ever since. This is a schematic i havent figured how to get the lines. Sinclair io board completed over 30 years later hackaday. Any discussions related to the creation of new hardware or software for the zx80 or zx81 511 topics 9508 posts last post re. It has no switches to turn it on you just connect it to the power supply. Timex sinclair is a result of joint venture between sinclair research ltd and timex corporation.