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  • I have a fantasyI have this fantasy that sinclair research will re-emerge out of nowhere, and release a new model of spectrum. Maybe exactly the same as the classic …

    Or if you still want to make your own, you might find this book handy:

    [url]http://www.amazon.co.uk/ZX-Spectrum-ULA-Design-Microcomputer/dp/0956507107/ref=sr_1_1?ie=UTF8&s=books&qid=1288346105&sr=8-1[/url]
    Matt_B Matt_B October 2010 Hardware
  • Proof of time travel?A woman is seen at a premier of a Charlie Chaplin movie, in 1920, talking into a MOBILE PHONE!!! [url]http://uk.movies.yahoo.com/blog/article/57334/…

    ... Best Spectrum Games (an excellent book, detailing many of the best ... missing, and I need the ULA from that to power my ...
    ewgf ewgf October 2010 Chit chat
  • Z80 Based Laptop[url]http://www.retroleum.co.uk/electronics-articles/previous/the-v4z80p-a-z80-based-laptop/[/url]

    ... for z80. The Rodney Zaks book is a classic for programming ... get hold of being the ULA which RWAP has a few ...
    spodula spodula November 2010 Hardware
  • repaired a 48K, yay :)I just managed to repair one 48K. After socketing all eight lower RAM chips (hard work!) and replacing few of them, it showed the familiar "Sinclair …

    ... least its relationship to the ULA and the requirements for video ... 're not dealing with the ULA. The upper RAM connects directly ... Smith's excellent book [I]The ZX Spectrum ULA[/I] useful.
    RST#08 RST#08 January 2011 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... /> (Ferranti engineer involvement in the ULA)

    Doubt this. ... in Chris Smith's excellent book, were used to finalize the ... actual total cost of a ULA (total engineering costs + marginal ... fraction of what a Ferranti ULA wants!

    The ...
    Winston Winston January 2011 Hardware
  • Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…

    ... , as I have a second ULA around which isnt doing anything ... people here and your awesome book! (Worth every penny), Thanks to ...
    spodula spodula February 2011 Hardware
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... the ULA.

    If you read Chris Smith's book you ... 'll find that the ULA design really ... AND fit in a 5C ULA with everything else that had ... to fit inside the ULA, AND met the design brief ...
    Winston Winston February 2011 Sinclair Basic
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... six weeks to develop the ULA.[/QUOTE]
    Such excuses ... Smith's book you'll find that the ULA design really ... fit in a 5C ULA with everything else that ... had to fit inside the ULA[/QUOTE]
    Any alternative ... patented then it's specific ULA content he made, but ...
    TVzombie TVzombie February 2011 Sinclair Basic
  • Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…

    ... URL="http://www.zxdesign.info/book/"]this book[/URL] and you'll ... internally by mistake, the ULA didn't apply enough contention ... timing compatibility, the later ULA versions had to keep using ... of the ULA design itself. The above mentioned book describes this ...
    Patrik Rak Patrik Rak March 2011 Hardware
  • Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…

    ... the software used to describe ULA matrix interconnections, connected wrong line ... like that. The Chris's book has all the details...
    Patrik Rak Patrik Rak March 2011 Hardware
  • Designing a game.Hi all Lets say that i have been impressed with the games being created by guys on WOS and want to have a shot at making a game myself,my ageing know…

    ... book based on collective knowledge here, similar to what ZX Spectrum ULA ...
    tstih tstih April 2011 Development
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... /> According to Chris's book about ULA the IO contention shouldn't ...
    vranik vranik July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... ;548250]According to Chris's book about ULA the IO contention shouldn ...
    csmith csmith July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... same test on a 48 ULA, because I don't have ... any spare ULA and it is well documented in your book.
    book about ULA 48 but it is impossible ... any information about ULA 128 or ULA +3 or ULA in ZX Interface ...
    vranik vranik July 2011 Hardware
  • ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …

    ... the original ULA contention algorithm (as described in the book by Chris ... original ULA contention algorithm (as described in Chris Smith's book)?
    adorigatti adorigatti August 2011 Hardware
  • MCODE problem...Hi Folks, Trying to write a simple machine code program to hatch the screen. So far I have the following but even this is not working - it does not…

    ... /> BTW, I have read your book and I am in awe ... ULA were. I can't say I understood everything in the book ...
    Paddy Coleman Paddy Coleman October 2011 Development
  • MCODE problem...Hi Folks, Trying to write a simple machine code program to hatch the screen. So far I have the following but even this is not working - it does not…

    ... ]BTW, I have read your book and I am in awe ... at Sinclair that designed the ULA were.[/QUOTE]
    Couldn't ...
    BloodBaz BloodBaz October 2011 Development
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    If the ULA has been replaced, the mod ... to do with the original ULA versions, but not the later ... mode !

    Glad the book turned up. The cockroach is ...
    csmith csmith October 2011 Hardware
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    ... relevant chapter in csmith's book, it was obvious that it ... with the version of the ULA in my machine. So I ...
    cmonkey cmonkey October 2011 Hardware
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... people will want. Take the book. Two years of solid effort ... new features for the enhanced ULA, I would choose something like ...
    LCD LCD November 2011 Development
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... /> I've tried changing the ULA and that makes no difference ... haven't checked the data book, but I'd rather assumed ...
    Zorn Zorn December 2011 Hardware
  • Create a new microdrive cartridge image formatHi there, I'm working to emulate the IF1+Microdrives in JSpeccy.I've found what the "classic" MDR format ins't capable to store all the required inf…

    ... not transparent to the IF1 ULA, you need to remove the ... Logan in the "Spectrum Microdrive Book" states that the tape is ...
    zx81 zx81 December 2011 Emulators
  • FPGA ZX SpectrumJust wonder: how many of you would buy "new hardware based" and "in case" ZX Spectrum based on FPGA? ;) [url]http://www.fpgaarcade.com/[/url]

    ... on Chris Smith's book); it supports ULA plus (64 color mode ...
    adorigatti adorigatti January 2012 Hardware
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... depends on the ULA revision according to csmith's book.

    guesser guesser January 2012 Games
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... depends on the ULA revision according to csmith's book.

    rich_chandler rich_chandler January 2012 Games
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... depends on the ULA revision according to csmith's book.

    BiNMaN BiNMaN January 2012 Games
  • SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…

    ... ]

    Right now the ULA timings aren't perfect; to ... ?T (and read csmith's book).
    Also, the UI is ... highly recommend reading Chris's book - My reading of it was ... to the internals of the ULA than the rest of the ...
    kphair kphair February 2012 Emulators
  • SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…

    ... highly recommend reading Chris's book - My reading of it was ... to the internals of the ULA than the rest of the ... at ?T-resolution. For the ULA to behave correctly, it needs ...
    AY Chip AY Chip February 2012 Emulators
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... part entitled "The importance of ULA cooling". Maybe you can find ... about your description of a ULA bug involving /RAS. The /RAS ... signal from the ULA is used to switch the ... a problem. Chris Smith's book says this means there is ...
    Zorn Zorn February 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... display corruption. With a 6C ULA temporarily installed in place of ... too quickly and so the ULA captures invalid or incorrect data ... . Slight timing differences between the ULA types mean this doesn't ... using this diagram from his book to show where the problem ...
    Zorn Zorn March 2012 Hardware
<1…15161718192021…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

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