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  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... 's version of the Sinclair ULA.



    This ... . The section on contended memory timing also applies to the TC2068 ... "the section on contended memory timing also applies to the TC2068 ...
    Fred Fred June 2015 Hardware
  • ZX81 Composite Mod<p>I've done a simple composite mod to my Issue 3&nbsp;ZX81 following a basic schematic I found on one of the ZX81 forums. Mod consists of a BC547, 1…

    ... it is related to the timing, becase the same problem ... He told me that the timing of the signal is untouched ... different resonators to make the timing as close to the ... improvement. Finally I replaced the ULA, which helped a lot, ... sensitive to the signal timing.
    jimre jimre July 2015 Hardware
  • TV Pal, odd and even framesI have been researching, but haven't found any real interesting information on this subject, so far. What I mean is, since TV PAL signal is interl…

    ... 9 to 13 of the ULA book.
    Superb source of ... advantage on odd/even frames timing, because there are only odd ...
    RMartins RMartins August 2015 Development
  • ULAAre ULA's (for Spectrum 48k's) interchangeable through the different issues? To give some background, to work out what was wrong with an old speccy I…

    ... Spectrum 48K ULA:

    - 5C102E: Original ULA, found on ... CPU in machines containing this ULA (Issue 2 boards).
    ... version, alters colour burst timing for increased compatibility with ... on the timing changes incorporated into the 6C001E-7 ULA.
    ...
    balford balford September 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…

    ... copy of "The ZX Spectrum ULA: How to Design a Microcomputer ... heart of Speccy hardware: the ULA and how it works together ... It includes detailed circuit diagrams, timing diagrams, logic tables, memory info ... , Z80 info, pixel generation timing etc etc etc. It's ...
    namtip namtip September 2015 Hardware
  • How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…

    ... between the z80 and the ula so a simultaneous access by ... to avoid contention to run timing critical code or to run ...
    Alcoholics Anonymous Alcoholics Anonymous October 2015 Hardware
  • Ninjaman 8-way scrolling 50Hz multicolour demo :-)Here's a demo I've been working on for a while. The goal was to make the best scrolling routine possible on a humble 48K ZX Spectrum. I was origin…

    ... Too late, and the ULA will already have read in ... the old attributes before the ULA read them.

    timing to account for the ... manually working out the timing on it would basically ... is doing exactly the same timing pattern, but when you ...
    Kayamon Kayamon November 2015 Development
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... you aren't replacing the ULA you need to allow it ... need to account for the timing of doing so and the ...
    AndyC AndyC November 2015 Emulators
  • The Infeasible GameMy new game will be available early next year. One or two little bits to sort and then I need to play test all the levels. For now, here is a short v…

    ... woody says it's the ULA snow (or sometimes called rain ...

    if you want timing critical accurate emulation I would ...
    BiNMaN BiNMaN November 2015 Brand new software
  • No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…

    ... RAM) and display issues (128K timing but a ridiculously short gap ... bunch of pixels by the ULA), the lack of memory contention ...
    zub zub November 2015 Development
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... is a diagram that shows timing relation between signals like Z80 ... / best way to tell ULA and Z80 accesses apart. Especially ... be documented, for different (!) ULA versions it's not afaik ... replacement module inserted)
    a) ULA version please! ;)
    b) ...
    RetroTechie RetroTechie November 2015 Hardware
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... RAM before and as the ULA timing is more critical than the ... have been when an older ULA was tried in a later ...
    1024MAK 1024MAK November 2015 Hardware
  • NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…

    ... /> But, if I had a ULA that was NTSC, wouldn't ... not work? Seems like the timing alone would be enough to ...
    cbmeeks cbmeeks December 2015 Games
  • 7mhz CPU?One of the things I like about Spectaculator, is that I can zap the clock speed of the emulated CPU up. Doing so makes me wonder about why the desig…

    ... difficult.

    Remember the ULA does a lot of hidden ... (in fact, ALL the signal timing), it does memory address decoding ... high speed.

    The ULA chips fitted to later issue ... compatible and using the original ULA chips would have made it ...
    1024MAK 1024MAK December 2015 Hardware
  • NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…

    ... /ts2068 is that the display timing is different. The current crop ... loop and look for a ula access at the top of ...
    Alcoholics Anonymous Alcoholics Anonymous December 2015 Games
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... />
    A picture that uses timing techniques to change the border ... to most effects is precise timing. The time each Z80 instruction ... ago, the relationship between the ULA and how it affects timings ... on the TV. As the ULA repeatly reads the value of ...
    mcleod_ideafix mcleod_ideafix December 2015 Vega
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... shadow before a character, when (timing-wise) what happens is that ... -converters) and in video encoder / ULA supply lines. A suitable coil ...
    RetroTechie RetroTechie December 2015 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... shadow before a character, when (timing-wise) what happens is that ... -converters) and in video encoder / ULA supply lines. A suitable coil ...
    1024MAK 1024MAK December 2015 Hardware
  • Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…

    ... be used to simulate the ULA/CPU outputs to the RAM ... arbitrary waveforms to give precise timing of output gpio level changes ...
    Korinel Korinel January 2016 Hardware
  • Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …

    ... line". As you say, the ULA does not depend or require ... generate the video picture. All timing for the video is done ... counters and logic inside the ULA. The only external connections are ...
    1024MAK 1024MAK February 2016 Hardware
  • Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…

    ... Amstrad line also stretches cpu timing by a different mechanism for ... between cpu + ula and only when the ula is accessing the ... contention off mode to do timing with and without, possibly with ... ula is.

    So not trivial at all. Unaltered z80 timing ...
    Alcoholics Anonymous Alcoholics Anonymous February 2016 Development
  • New version emulator ZEsarUX 3.1Hi I have uploaded a new version of my emulator ZEsarUX on http://sourceforge.net/projects/zesarux I have improved accessibility support, no…

    ... .worldofspectrum.org/forums/discussion/49512/timing-tests-48k-v1-0-results ... - and it failed when the ULA was changed and/or different ...
    Dunny Dunny February 2016 Emulators
  • New Retro Virtual Machine v1.1.0Hello everyone, a new version of Retro Virtual Machine https://www.youtube.com/watch?v=vDXHnelI49A Change Log: Added the ZX Spectrum+ with s…

    ... .
    Rewritten whole image generation ULA code to a more accurate ... loading code
    Fixed the timing of the Spectrum 128k / +2 ...
    jcgamestoy jcgamestoy March 2016 Emulators
  • So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…

    ... as I'd assumed the ULA had failed many years ago ... line for realigning luma/chroma timing, which the TEA2000 does not ...
    Peter Mulholland Peter Mulholland May 2016 Hardware
  • What's the best solution for audio loading on a 48k?I have three 48k Speccies. All have been recapped and AV modded, but only one (an issue 4A) is currently loading via Teezix. (the other two (issue 3…

    ... is digitized in the ULA. Only the timing of the flanges of ...
    ingo ingo May 2016 Hardware
  • Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…

    ... over 30 specified or recommended timing parameters!

    In simple ... the other hardware (CPU or ULA).

    If a slow ... too slow, the CPU or ULA will not receive the correct ...
    1024MAK 1024MAK August 2016 Hardware
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... the clock generated by the ULA with the oscilloscope I saw ... correct (at least from the timing and "waveform shape" point of ...
    Trantor Trantor January 2017 Hardware
<1…13141516171819…34>

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