Zxtunes it is worlds biggest zx spectrum 8bit music collection news musicians software harware interviews podcasts stats forum faq music. Zx spectrum fans continued on this development which resulted in the design that is now known as the harlequin superfo. News f5 to update 20161018 added video retrocod 2016 talk. In the issue 2 spectrum the level shifting network is passive, incorporating two potentiometers vr1, vr2. Nebula spectrum ula chip replacement module the nebula is a spectrum 48 daughterboard, designed to replace the ula chip found in uk spectrum motherboards versions 2 to 6. These resistors connect to the z80 databus, and allow the z80 to read or write in this ram area. The zx spectrum 16k48k ula went through multiple revisions and is either a 5c or 6c series ferranti ula. The ula uncommitted logic array is a chip which controls most of the interfaces between the z80 cpu and peripheral functions. The first is a modified version of the zx spectrum 128 editor.
The inputoutput section of the spectrum is centered round the ula ic1. For the first time, a computer with highresolution graphics, colour, sound and 48k ram was sold under. The biggest changes were, of course, occasioned by the step up to 128k and then to the amstrad designs. Zx spectrum design in a digilent spartan 3 starter board.
Games and entertainment software for the zx spectrum. Zx spectrum, no 5v repair when repairing something like a zx spectrum, its good to run it on a soak test for a while. You can now assemble a complete and 100% compatible zx. Fuller box and dktronics psg software compatible with each other. It is anticipated a zx spectrum with a 5c102e ula will not function properly if fitted with this module. Acorns wouldbe zx spectrum killer, the electron, is 30. Once more sinclair revolutionized the microcomputer industry with new standards. Jul 30, 2010 the zx spectrum ula is an essential read for the electronics hobbyist, student or electronic engineer wishing to design their own retrostyle microcomputer or anyone with an interest in historical microelectronic and digital 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 hobbyist programs. The world of spectrum faq, maintained by arjun nair. Ulaplus was finally realized in an fpga core by alessandro dorigatti in february 2011. The zx97lite is a simplified zx97 designed to fit on one single sided pcb.
Afterwards i got many comments that for a kit it was too difficult to build due to the use of smt. A special shoutout to ewan spence for his play through of the game on his retro spectrum youtube channel. Cpu running at a higher frequency 4 mhz which made it less compatible. C41, c42, c43, c44, c45, c46, c47 r77, r78, r79, r80, r81, r82, r83, r84, r85, r86 ic16, ic17, ic18, ic19, ic20 xl2 internal disc drive header led header include. In place of the bbcs various ancillary logic chips, the electron would employ a single uncommitted logic array ula chip, a trick sinclair had employed in the. Sinclair zx spectrum manuals manuals and user guides for sinclair zx spectrum. It was designed by myself, phil ruston pcb design, mostly and alessandro dorigatti logic core between 20152016. The official home location of the tzx format the current version is v1. Lists of the components omitted for either model are included. For the output wires you have a choice to make, either integrating a small video jack 3. This is an implementation of the sinclair ula chip, found in zx spectrum microcomputers. Cybernoid, exolon, into the eagles nest, head over heels, but many other newer games dont do so. The schematics have been redrawn using the gschem schematic editor from the open source geda project. The spectra interface is a multipurpose peripheral for the 16k48k zx spectrum.
Datacorder pcb dv1 dv2 dv3 dv4 dv5 dv6 dv7 d3 d2 d1. The second phase has been to convert each transistorresistor based schematic into an equivalent logic gate schematic. We have 3 sinclair zx spectrum manuals available for free pdf download. Using the jsmess emulator, users can boot up an emulation of the given title and use it in their browser. The functions performed within the device include tv video compilation, keyboard scanning and tape inputoutput. Based on chris smiths excellent book the zx spectrum ula.
Sound from the ay38912 actually a ym2149 core from fpga arcade is mixed in as well. Zx spectrum next by 1024mak view the latest post thu may 07, 2020 9. Sign up schematic of a 8bit computer, clone of sinclair zx spectrum. A call to the test routine in rom1 is replaced with code to reset the timex ula. Scrplus converts images to formats suitable for use with the zx spectrum, using innovative and highly effective algorithms to produce as faithful a rendition of the original image as the limited spectrum palette allows. In this case, it was an issue 2 board where the colour had drifted, so i wanted to let it run for a while, and run from cold the next day to make sure it hadnt drifted again. This is repeated for each of the 24 character rows. Feedback suggests the same problem affects not more than 1% of zx spectrums that have a 5c112e ula. The zx spectrum ula is an essential read for the electronics hobbyist, student or electronic engineer wishing to design their own retrostyle microcomputer or anyone with an interest in historical microelectronic and digital design.
Once proof copies have been checked, distribution will begin. The zx97l is a complete zx81 using discrete logic chips with 32k of battery backup ram and 32k of eprom. Zx spectrum pcb schematics and layout spectrum for everyone. These match the ula output levels with those required by the by and ry inputs to the modulator. Which ports are which on this soviet zx spectrum clone. Discussion forums for users of the sinclair range of computers zx80, zx81, zx spectrum, their clones and cambridge z88. Simple start to retrofitting a zx81 zx81 keyboard adventure.
Fuller box and dktronics psg software compatible with. The spectrum was in russia like the vc20 or c64 over here. The value of this bit drives the sign bit of the output to the wolfson audio codec. The zx spectrum ula has been reverse engineered into full schematics, which are being analysed and written up into the sinclair zx spectrum ula book. The harlequin is an implementation of that reverse engineered design, it has been around for a number of years, and currently seems to be fairly stably on revision g. The lil old zx spectrum 48k service manual section 1. The zx spectrum motherboard is fairly straightforward by modern standards. To start, its simply a matter of attaching the input wires to the back of the zx81 circuit board. Most visitors to our beautiful isle know to behave themselves, treating the locals with respect and admiring the scenery. Software and games for the lambda 8300 power 3000 computer.
Zxtunes it is worlds biggest zx spectrum 8bit music collection. Spectrum faq, 301105 since the faq is no longer maintained, for technical details you may want to see the tech info wiki. The cost of running this website is covered by advertisements. Its primary function is to allow the spectrum to be connected to a tv via a scart socket to produce an rgb picture that is sharp, bright and free from dotcrawl. The majority of the new attribute modes can only practically be accessed using machine code but a few can be controlled directly from basic and these are described later in this. Issue 1 schematics and layout pdf issue 2 schematics and layout. The second is an exact copy of the original zx spectrum basic but has trdos traps in place of the character set. However, it wasnt until nearly a decade later after the ula was reverse engineered that this actually became possible. Besides the normal 16colour spectrum screen, it can also produce 64colour ulaplus images. Nov 26, 2016 based on chris smiths excellent book the zx spectrum ula.
The sinclair zx spectrum ula book the zx spectrum reverse engineering and clone desgin blog. Pinouts from the cassette recorder in the spectrum. From the ula the colour difference signals are applied to the colour modulator ic14 via two level shifting networks. Simple start to retrofitting a zx81 by david stephenson 03 february hardware. The second is an exact copy of the original zx spectrum basic but has trdos traps in place of the character set 0x3c000x3fff is filled with push af.
Zx spectrum lounge a place to discuss the zx80s and zx81s younger brother the sinclair zx spectrum 83 topics 561 posts last post re. Zx spectrum clone built around an earler version of the ula design. Here youll find schematic and layout information for various models of the zx spectrum. The zx spectrum reverse engineering and clone desgin blog harlequin a site dedicated to the reverse engineering of the zx spectrum and related projects. The heart of the zx spectrum series of computers is a custom chip called the ula uncommitted logic array. Ulaplus is a plugin replacement ula for the zx spectrum which increases the total palette to 260 colours. This is essential to understanding how a zx spectrum works see zx spectrum schematic for details. Retrocomputing stack exchange is a question and answer site for vintagecomputer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear. Like deltan, rita or jaguna and endless variations of zx specy spectrum in english, russian or mixtures thereof and many regional names like dubna, leningrad, ural, krasnojarsk, moskow, and so on.
Aug 23, 20 in place of the bbcs various ancillary logic chips, the electron would employ a single uncommitted logic array ula chip, a trick sinclair had employed in the zx81 and spectrum. I dont think this board uses a ula looking at the schematic traal linked, its all 74series logic. The zx spectrum version the zx spectrum version of tuttut has been a huge success all off its own. Zx spectrum timex to 128k upgrade zx spectrum 48k to zx spectrum 128k compatibility. Sinclair spectrum after the success of his two previous computers, the zx80 and particularly the zx81, in april 1982 sir clive sinclair presents the zxspectrum. The beeper, present in all versions of the spectrum, is driven by toggling a bit in the ula register in software.
The total number of controlled dots screen resolution for a zx81 screen is 256x192. This was a technology pioneered by ferranti, of which sinclair was one of the first adopters incorporating all of the discrete logic of the zx80, plus a nmi generation circuit into the initial zx81 2c158e ula. All these resistors allow the ula to specify an address, and read the screen data from the lower ram without the z80 interfering. 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. For a comprehensive description of how the spectrum generates its tv picture, refer to the zx spectrum ula book 1. They are a much cost reduced implementation of the spectrum hardware, consolidating much of the functionality formerly accomplished by the ula, various logic ics, pcf, amstrad 40057, and hal into a single qfp gate array designated amstrad 40077.
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