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<1234567…34>
  • Zero 0.7 / Zero 0.6.5 releasedAfter months of grueling work, I?m proud to announce the Vanilla version of Zero, which is a regular Windows version of the emulator. I?ve tried to m…

    ... emulation (FrankT).
    ? Fixed a contention timing issue with IN.
    ? Fixed ... machines (doh!).
    ? Fixed machine timing not being read or saved ...
    Arjun Arjun January 2015 Emulators
  • Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…

    ... the weekend I solved the timing problem that was causing ... seemed would be a small timing discrepancy with a ZX ... to be a significant memory contention timing issue....

    Anyway, ... before - all due to this contention issue.

    Full ...
    csmith csmith August 2007 Hardware
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... 8. The timing of the IO contention however is ... />
    [CODE]14336 IO Contention Starts
    14337 -
    14338 Memory Contention Starts
    14339 First display ... experience memory contention.

    The memory contention timing is ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... documents the floating bus timing and how contention affects instructions.
    contention timing is also correct and contention starts at ... the point of the contention timing is to stop the ... talking about which cycles the contention is [B]actually[/B ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... The timing you're showing here are the IO CONTENTION TIMINGS!< ... statement come about because contention was investigated using IO ... only. Also, the memory contention timing must span the 4 video ... for 6 cycles, Memory contention starts at 14338 and ...
    csmith csmith September 2007 Emulators
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... are the memory-paging & contention timing differences, but I'm doubting ...
    bobs bobs December 2007 Games
  • New Spectrum game - Isotopia by OctocomOctocom, the guys who made BASIC programmed games such as Pandemia or Insert Coins, released yesterday their very first compiled BASIC game: Isotopia…

    ... are the memory-paging & contention timing differences, but I'm doubting ...
    na_th_an na_th_an December 2007 Games
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... was trying to determine the contention timing for you all ;-)
    ... speccy, then no problem. No contention.

    If ... ink and paper colours. Eeek! Contention.

    [b ... a particular palette contention model and access timing (ie dynamic palette ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... early stage of development, and contention timing. Everything else about the design ...
    csmith csmith November 2009 Emulators
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    So the question for games not running properly is not that the CPU contention timing is different, but that contention is applied differently to memory banks on the toastrack/+2 and the +2a/b/3.

    Which runs the most games?
    csmith csmith January 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... that the CPU contention timing is different, but that contention is applied differently ...
    BiNMaN BiNMaN January 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... that the CPU contention timing is different, but that contention is applied differently ... /+2B, or written assuming the contention in the manual will work ...
    guesser guesser January 2011 Hardware
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... there's no memory contention afecting this operation, thus ... main screen access regardless of contention.

    Moreover, ... so it matches the memory contention timing reported earlier (as expected).< ... were the same. No timing variation was identified in ...
    Einar Saukas Einar Saukas August 2012 Emulators
  • 20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…

    ... graphical representation of where the contention delays fall, so that ... in assembler/simulator with full contention emulation. I'm sure ... 8th one for syncing with contention timing and waiting for about ... cannot lose the sync with contention :)

    by ...
    Arda Arda July 2013 Development
  • Zero 0.6I'm pleased to announce that I've released Zero 0.6. There are some comprehensive changes in this release including moving to .Net 2.0, removing Slim…

    ... have re-introduced an IN contention timing bug on the 48k model ...
    Arjun Arjun July 2013 Emulators
  • Zero 0.6I'm pleased to announce that I've released Zero 0.6. There are some comprehensive changes in this release including moving to .Net 2.0, removing Slim…

    ... have re-introduced an IN contention timing bug on the 48k model ...
    rich_chandler rich_chandler July 2013 Emulators
  • Zero 0.6I'm pleased to announce that I've released Zero 0.6. There are some comprehensive changes in this release including moving to .Net 2.0, removing Slim…

    [QUOTE=Arjun;712826]but there are still some other bugs to iron out including one where I seem to have re-introduced an IN contention timing bug on the 48k model. I just can't catch a break![/QUOTE]

    what is Steps To Reproduce?
    ZXMAK ZXMAK July 2013 Emulators
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... spent on figuring out the contention details [URL="http://www.worldofspectrum ... point is to test the contention timing, not the emulation of peripherals ... subsequent INs and thus the timing at all. I guess I ...
    Patrik Rak Patrik Rak November 2014 Emulators
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... spent on figuring out the contention details [URL="http://www.worldofspectrum ... point is to test the contention timing, not the emulation of peripherals ... subsequent INs and thus the timing at all. I guess I ...
    Richard_Butler Richard_Butler November 2014 Emulators
  • If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…

    ... be able to keep video timing relatively consistent, though I'm ... sure whether to introduce the contention timing to the lower 16k of ...
    cj7hawk cj7hawk February 2021 Hardware
  • New Version of MAME Emulator out with enhancements on Spectrum-EmulationNew Version 0.216 of MAME Emulator out with enhancements on Spectrum Emulation: [url="https://www.mamedev.org/?p=476"]https://mamedev.org/?p=476[/…

    ... timing of M cycles; spectrum.cpp: Improved emulation of bus contention ... 9670: spec128.cpp: Completed bus contention emulation for Spectrum 128 and ... br /> -spectrum128/2A/3: Improved contention timing emulation (#9670) [holub]
    < ...
    Luzie Luzie May 2022 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... playing a bit with memory contention and floating bus stuff in ... sense it starts applying the contention a few cycles earlier, namely ... , as well as correct any timing information stated above. I would ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... I added support for Pentagon timing instead, so I can finally ... the floating bus behavior and timing. An explanation how the ULA ... the bytes without any memory contention would be nice, too.
    Patrik Rak Patrik Rak November 2007 Emulators
  • 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…

    ... 0x7ffd, 0xbffd and 0x3ffd port contention behaviour.

    To correct the excessive contention, I replicated ULA14 and ... someone describe accurately the contention behaviour for the 128K ... differentiate between machines through timing?
    3. What ...
    csmith csmith July 2011 Hardware
  • Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…

    ... don't take account the contention. There are two instruction with ... contention, OUT (FE),A that affects ... one.

    All this timing is for 48K machines. The ... compared with the teorical (without contention) values. If we take the ...
    antoniovillena antoniovillena February 2013 Development
  • Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…

    ... awkward it even throws up timing differences between the 128K and ... hit all the most awkward contention.[/QUOTE]
    I think ... cycles (extended to 16 by contention). But then I should ... to get ahead on the contention cycle. Assuming that writing those ...
    joefish joefish October 2013 Development
  • New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …

    ... the ULA timing 100% right. We know when the contention pattern starts ... uses early or late CPU timing, please run the btime test ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…

    ... about the Speccy's video contention model - and that's the ... /> And then there's the contention pattern where the memory is ... 16, so that means the contention pattern covers a run of ... there some odd stop-start timing thing going on between pairs ...
    joefish joefish January 2016 Hardware
  • TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …

    ... /> Is their away of obtaining timing information on ZX128k other than ...
    GBNvK GBNvK January 2004 Development
  • Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…

    ... a correct map for memory contention?

    Address Size Area ...
    ZJones ZJones September 2006 Development
<1234567…34>

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Related Threads

  • Contention and floating bus timingHello,<br /> <br /> I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit.…
  • 5C Horizontal timing vs 6C horizontal timing.Hi all,<br /> <br /> Just considering the timing difference in the video signal between the 5C and the 6C where the 6C ULA seems to have 50% longer…
  • TimingHey All,<br /> <br /> Is their away of obtaining timing information on ZX128k other than addresses 23672-&gt;23674. Basically I would like to identi…
  • Z80 cycle contentionHi,<br /> Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?<br /> I mean which Z80 clock cycle, T1 or T2?<br /> …
  • Memory Map/ContentionHi <br /> I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scr…
  • I/O contention model questionHi everyone,<br /> <br /> Sorry for my poor english. Together with a friend we are working on ZX<br /> Spectrum 48k implemented in FPGA. We have foun…
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
  • Timing... in the CSS faqI was looking at the CSS faq for something completely unrelated and noticed:<br /> <br /> [quote]<br /> Then the 192 screen+border lines are displaye…
  • 48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background<br /> <br /> [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/…
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