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<1234567…34>
  • How to get a minimal splib2Hello. We are designing a new engine and stuff, coded in ASM and to be used from z88dk. I was just wondering how to get a minimal splib2 with just th…

    ... designing a new engine and stuff, coded in ASM and to be ... . I was just wondering how to get a minimal splib2 with just the ... /Keyboard related routines get added to the binary? Or do I ... have to do anything fancy?

    na_th_an na_th_an July 2011 Development
  • 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. …

    ... in "The ZX Spectrum ULA: how to design a microcomputer" book by Chris Smith
    to the ULA
    - 3 ... The tape player is synchronized to the CPU speed, so tapes ... ULA)

    At today, to boot the core some simple ...
    adorigatti adorigatti August 2011 Hardware
  • How to convert a .txt file (ASCII/PC) into a Tasword file?Short version: [B]How can I convert a .txt file (PC) into a Tasword file (ZX Spectrum)?[/B] Longer version: {Maybe I should first re-introduce mysel…

    ... . It is fascinating to see how kids react to a Spectrum. They are astonished ... on page 22 how to convert a Tasword file into a .txt file that ... way round: [B]how to convert a .txt file into a Tasword file (Tasword ...
    ZXHistory ZXHistory May 2013 Games
  • How to stop a flickering character erasure?I'm trying to figure out how to build a moving sprite. Eventually it will be made up of several UDG's. However its early days yet so I'm experimentin…

    I'm trying to figure out how to build a moving sprite. ... I'm experimenting with a character that moves by ... the character to flicker, is there a way to avoid this ... ?

    5 FOR x = 0 to ... 20 STEP 1
    10 PRINT AT 0, x; "A ...
    mik3d3nch mik3d3nch May 2018 BASIC
  • How to write a simple BASIC* horizontal scrolling game (Tutorial) [b]How to write a simple BASIC* horizontal scrolling game[/b] In this tutorial, we will be talking about how to write a simple BASIC* horizont…

    [b]How to write a simple BASIC* horizontal scrolling game[/ ... , we will be talking about how to write a simple BASIC* horizontal scrolling ... : FOR a=60000 TO 60021: READ p: POKE a,p: NEXT a
    20 ... : FOR a=60000 TO 60021: READ p: POKE a,p: NEXT a
    20 ...
    Timmy Timmy September 2020 Development
  • How to write a simple C+asm horizontal scrolling game (Tutorial, z88dk)[b]How to write a simple C/asm horizontal scrolling game[/b] [b]Note:[/b] This tutorial has multiple parts... I am still writing but this first pa…

    [b]How to write a simple C/asm ... take some time to get it to work properly, so ... This is just a simple batch file to start compiling your ...

    [b]A) Drawing a scrolling screen[/b]

    to the subroutine called "scroll_left()", ...
    Timmy Timmy September 2020 Development
  • How to write a simple game in C+asm.This is just a link to an old post in Development, about a post of making a simple game in C for the Spectrum. It was suggested that this thread shou…

    ... a link to an old post in Development, about a post of making a ... .org/forums/discussion/57925/how-to-write-a-simple-c-asm-horizontal ...
    If you are new to the game, you might also ... .org/forums/discussion/57924/how-to-write-a-simple-basic-horizontal-scrolling ...
    Timmy Timmy April 2021 C
  • ZX Spectrum 48K clone and test resultsHi! This is my first post, so, first of all, I'd like to say hello to the whole community! I am Alessandro Dorigatti from Italy and I'm developing …

    ... , I'd like to say hello to the whole community!
    how to design a microcomputer"; I'm really trying to emulate the machine ... .

    Now, coming to the tests, the V6Z80p version ... />
    This appears to be a problem with the even port ...
    adorigatti adorigatti July 2011 Hardware
  • Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …

    ... issue 2 with a 5C112E-2 ULA. Just had to replace TR4 ... than it is supposed to be according to the PAL norm and ... book "The ZX Spectrum ULA: How to design a microcomputer"
    - U and V continue ... composite video signal which goes to the RF modulator (after TR1 ...
    paf paf November 2018 Hardware
  • Spectrumpedia revised and extended edition. Suggestions about possible new contentFor the 40th anniversary of the first launch of the Spectrum, I am going to revise the Spectrumpedia. Feedback was very positive, although the fact t…

    ... abhor, with a few exceptions), I am open to suggestions in ... ZXMAK2

    [i]To be added to Chapter 1[/i]

    [i]To be added to Chapter 4[/i]
    How To Design A Microcomputer,[/i] ZX Design and Media, Dinas Powys ...
    Alessandro Grussu Alessandro Grussu October 2021 Sinclair Miscellaneous
  • ULA Price Poll - You get to chooseIt is difficult to set the price of the book. If it is too low I will undersell my efforts, too high and I overcharge. So choose what you would be w…

    ... , all that is required to design and implement a microcomputer (ok an '80s one ... more complex). Topics like how to generate a picture on a TV, with [u ... ZX Spectrum ULA: How to Design a Microcomputer"

    You get a whole lot more ...
    csmith csmith February 2010 Sinclair Miscellaneous
  • Strangely, I just can't STOPOK, I bought an RWAP keyboard matrix and put it in my Spectrum+ last night (ta), I did the Swedish composite mod with a capacitor, I fixed the missin…

    ... is this, it's strange how I can still detect the ... readings for reporting one keypress to the editor. This could explain ... -ideafix: The coming ULA book ("How to design a Microcomputer") might shine some light upon ...
    roko roko April 2010 Sinclair Miscellaneous
  • ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…

    ... that it'll be accessible to a general audience. As quoted from ... The ZX Spectrum ULA: How to design a microcomputer" is pitched to be readable by the ... be readable by anyone with a general interest who can ... retro-hardware fan or just a piece of shelf-candy for ...
    gasman gasman August 2010 Sinclair Miscellaneous
  • ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…

    ... br /> * The ZX Spectrum ULA: How to Design a Microcomputer
    * Video Gaming Manual
    * Core Memory: A Visual Survey of Vintage Computers ... />
    * The ZX Spectrum ULA: How to Design a Microcomputer

    by Chris Smith ...
    csmith csmith September 2010 Sinclair Miscellaneous
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... of 'The ZX Spectrum ULA: How to Design a Microcomputer' Book. It arrived on Saturday ... .

    So I spent a good part of Saturday dipping ... bits. I have now started to read it from the front ...
    1024MAK 1024MAK October 2012 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... />
    Is there a good description of how the ULA reads from ... video ram from a hw ... The ZX Spectrum ULA [I]How To Design A Microcomputer[/I].[/URL]
    It explains ... how (and why) the ULA ...
    guesser guesser March 2014 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... information on the ULA and how it works, read the book ... /book/"]"The ZX Spectrum ULA: How to design a microcomputer"[/URL]

    [I][B ...
    1024MAK 1024MAK March 2014 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... The ZX Spectrum ULA [I]How To Design A Microcomputer[/I].[/URL]
    It explains ... how (and why) the ULA ... signals as inputs to a YUV-device (as a converter or a monitor) because ... This is needed and usefull to have for the simple PAL ...
    ingo ingo March 2014 Hardware
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... this in a way that makes sense to the rest ... , 'The ZX Spectrum ULA: How to Design a Microcomputer' upon which much of my ... or a 'snow' effect on screen). A less efficient design would need to ... DRAM row tends to deal with a different display column!< ...
    zub zub May 2014 Sinclair Miscellaneous
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    [QUOTE]Not sure how much you're already ... 's accessible to all! I'm not a hardware bod ... this in a way that makes sense to the rest ... , 'The ZX Spectrum ULA: How to Design a Microcomputer' upon which much of my ... /> I was with you up to about there :lol:
    ...
    ASH-II ASH-II May 2014 Sinclair Miscellaneous
  • What is the Sinclair ZX Spectrum Vega and what does it mean?Just stumbled upon this Indiegogo page following a tweet from SpeccyNews [url]https://www.indiegogo.com/projects/sinclair-zx-spectrum-vega[/url] it…

    ... /> My original plan was to produce a comparative survey among different groups ... one of the talks related to his 'How to Design a Microcomputer', and so it's ... really interesting to see people's reaction to ...
    alexcasper alexcasper August 2015 Sinclair Miscellaneous
  • Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…

    ... /"]The ZX Spectrum ULA: How to design a microcomputer[/url], was in the ... sure if there is a [url="http://www.zxdesign ... I wouldn't mind to test and eventually produce ... FPGA , CPLD, PAL, etc) to mimick any of the ZX ...
    I have quite a few to fix my self :)
    RMartins RMartins August 2015 Hardware
  • Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…

    ... /"]The ZX Spectrum ULA: How to design a microcomputer[/url], was in the ... sure if there is a [url="http://www.zxdesign ... br /> Apparentely, Chiis Smith managed to [url="http://www.zxdesign.info ... /ulaReplacementWorks.shtml"]successfully replace a ULA[/url], but I ...
    RMartins RMartins August 2015 Hardware
  • Is there a ZX Spectrum Hardware manual?I'm quite new to the ZX Spectrum world, looking for a definitive guide to the ZX Spectrum hardware so I can really start to understand what's going o…

    ... "The ZX Spectrum ULA: How to Design a Microcomputer" by Chris Smith. Published ... in 2010, it's a modern book about the ... hardware: the ULA and how it works together with ... etc etc. It's a fascinating insight and although ... of you're going to do lots of repairing ...
    namtip namtip September 2015 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    ... book/"]The ZX Spectrum ULA: How to design a microcomputer[/url] goes into great ... method that the ULA uses to generate the [url="https:// ... then converts the YUV signals to a composite colour signal, which ... is then modulated to RF by the modulator.
    1024MAK 1024MAK September 2016 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    The blue output was altered during the Spectrum's design phase. At least I think that is what is said in the book [url="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url].

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK September 2016 Hardware
  • ZX Spectrum video waveformsAll work for this post was done on a ZX Spectrum issue 1 board (16k bytes of RAM only). This was what the Spectrum displayed on the TV screen: [i…

    The blue output was altered during the Spectrum's design phase. At least I think that is what is said in the book [url="http://www.zxdesign.info/book/"]The ZX Spectrum ULA: How to design a microcomputer[/url].

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK September 2016 Hardware
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... here. Are you trying to say that every emulator written ... book "The ZX Spectrum ULA: How To Design A Microcomputer" is also incorrect as it ... advice would be to get hold of a copy of Chris' ... of and give you a complete understanding of how a display is created.
    rich_chandler rich_chandler October 2019 Emulators
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... "The ZX Spectrum ULA: How To Design A Microcomputer" is also incorrect as ... :-) Especially the parts related to video generation. I actually ... a few posts ago. Yes, the observations seem to contradict to ... this, and that puzzles me a lot. ...
    kosarev kosarev October 2019 Emulators
  • Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…

    ... “The ZX Spectrum ULA, How to Design a Microcomputer” book gives the input threshold ... that changes from a low level to a high level, stays ... back to a low level. [a high pulse].
    Or a signal ... and then changes back to a high level. [a low pulse].
    ...
    1024MAK 1024MAK October 2019 Development
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