Minstrel zx80 clone the minstrel is a fully compatible zx80 clone with 16k ram that can run the original 4k rom basic, or the later zx81 style 8k rom basic. Sound has an amazing clarity too bringing this close to being the. A couple of years ago, chris smith reverse engineered the zx spectrum ula you can obtain the zx spectrum ula book to read about that. How to design a microcomputer has been completed and the book is with the. Also includes builtin kempston and sinclair joystick interfaces ports, tv and rgb monitor output, printer interface. In the schematic, the ras and cas lines are drawn incorrectly for ics 15 to 22. The schematic of the keyboard has been thoroughly researched so that im sure it will be compatible with both my clone, and with a real zx81. The zx spectrum ula has been reverse engineered into full. Zx spectrum was a very popular well, at least in great britain and spain home computer released in 1982 by sinclair research ltd. The mini psu is a traco unit, the same as is commonly used in. Superfo harlequin 128k kit computer retrocomputers.
Hands on with the just speccy 128 by zaxon retro games. Zx spectrum fans continued on this development which resulted in the. Building a harlequin zx spectrum clone ive been working on a lot of zx spectrum and zx spectrum related items recently, and have now built a zx. Scrplus converts images to formats suitable for use with the zx spectrum, using innovative and highly effective. Zx spectrum clone with considerably different hardware spec. This shows the working screen of the first program from the horizons demo tape spanish version, the one that teaches the hardware of the spectrum. Building zx spectrum clone harlequin part 1 malinov. This is a kit which can be used to build a zx80 clone. 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 following is a list of clones of sinclair researchs zx spectrum home computer. Tynemouth software llp old computers, new computers, bespoke web design and software development, computer repairs, it and media services uk saturday, 3. Desktop sinclair zx spectrum manual 83 pages desktop sinclair zx81 user manual 16 pages desktop sinclair zx81 user manual 92 pages desktop sinclair. Zx spectrum clone built around an earler version of the ula design.
A czechoslovakian clone of zx spectrum, developed by frantisek kubis at 1984, student of ef svst electrotechnical faculty of slovak technical university bratislava. While it was software compatible with zx spectrum 48k and has two interface 2 joystick. Testing a zx spectrum clone running at 7mhz cpu clock speed. Zx spectrum fans continued on this development which resulted in the design that is now known as the harlequin superfo, with 128k versions like the harlequin rev 2d. Cas connects to pin 6 on ic23 and ras to pin 4, not the reverse as.
And while towards the end of 1980s its popularity declined. News f5 to update 20161018 added video retrocod 2016 talk. The zx spectrum reverse engineering and clone desgin blog harlequin. Leningrad this is a design for a selfbuilt zx spectrum for hobbyists. I added a jumper in the top left to select internal or external power. Input is via an 8x5 matrix keyboard see below for options, output via composite video improved over the original zx80 design. The internet archive software library is a large collection of viewable and executable software titles, ranging from commercially released products to public domain and. Minstrel 2 zx80 clone from tynemouth software on tindie. This computer is a clone of the zx spectrum 128 computer a computer that isnt currently in my collection.
Zxbadaloc clone also from alessandro poppi, this is not an interface for a standard spectrum but a complete clone designed to fit into the rubberkey case. This is a self build computer kit that i have wanted for a long time. Also because his compact sized and his low cost price voltage level shifters would raise the price. Got a pcb from the developer and a load of parts from digikey for another version of countless zx spectrum clones. There is one particular roadblock to building zx spectrum compatible computer. A pcb has been developed by don superfo, which uses discrete logic to.
Starting a zx spectrum clone project page 1 eevblog. The person who sold it to me had inherited it and had no idea how it worked. It is one of the first selfmade clones of zx spectrum in the soviet union. Tynemouth software llp old computers, new computers, bespoke web design and software development, computer repairs, it and media services uk. For 8 years i played in the spectrum in black and white and everyone knows why.
Neither in the dandy new reality program, nor in from the screw, nor in any. The schematics have been redrawn using the gschem schematic editor from the open source geda project. Heres a brief overview of the various spectrum pcb revisions, this section is split into three main areas. Ive been tempted a few of times to buy one of the assorted bare pcb harlequin boards on ebay, but was never sure if they would work. The zx spectrum reverse engineering and clone desgin blog the sinclair zx spectrum ula book a site dedicated to the reverse engineering of. Soviet leningrad design for selfbuilt zx spectrum clone little bat. Zxtunes it is worlds biggest zx spectrum 8bit music collection. A nicely built pcb with 45 chips most 74family inside. Amstrad cpc, c64 and zx spectrum to the latest free indie pc releases weve got it all. You can now assemble a complete and 100% compatible zx spectrum 128k clone yourself. Image quality on my 42 inch led tv using the custom rgb cable is simply amazing, pin sharp and as colourful as uncle clive intended. Which ports are which on this soviet zx spectrum clone. Zx spectrum 128k replica with real z80 cpu and almost all logic in cpld altera epm7128stc100.
Tynemouth software llp old computers, new computers, bespoke web design and software development, computer repairs, it and media services uk saturday, 3 february 2018 keyboard options for the zx max 48 zx spectrum clone. Keyboard options for the zx max 48 zx spectrum clone. Zx spectrum design in a digilent spartan 3 starter board. There seem to be some differences in the order of keyboard. Here youll find schematic and layout information for various models of the zx spectrum. Ula designed from discrete 74xx ics, screen part or ram was synchronized perfectly, without cpu blocking. Building a harlequin zx spectrum clone tynemouth software. It seems to be a homemade clone, rather than a factorybuilt one.
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