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Search Again :: Adv Search 1000 results in 0.013s
<1234567…34>
  • 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…

    ... one.

    All this timing is for 48K machines. The ... ) values. If we take the 128K clock (3.5469), the numbers are ...
    antoniovillena antoniovillena February 2013 Development
  • Emulating the SamRAM on the ZX Spectrum SEGerton Lunter gave me permission to reuse the code, but so far I have not been able to get the software to work in paged RAM banks.

    ... to watch some multicolour /strict timing 128K demo then.

    [quote ... European Timexes have the same timing as the European 48K machine ... an issue. The 128K operates at a faster clock speed than the ... SE runs at the same clock speed (3.5Mhz). And the ...
    lordcoxis lordcoxis October 2005 Emulators
  • populated Harlequin Rev.D -> Rev.FHi, I like to sell my Harlequin Rev. D board. I modified it to be identical to Rev. F: * switching regulator instead of linear regulator for DC in …

    ... SCART
    * correct hsync timing
    * correct clock phase at edge connector ...
    ingo ingo June 2014 Sales
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... problems with the ZX Spectrum clock signal.[/QUOTE]
    The ... board? Besides, the Spectrum 48K/128K clock is not periodic: it has ... a softcore to regenerate the clock signal from the original because ... / joystick interface would need a clock to be in phase with ...
    mcleod_ideafix mcleod_ideafix September 2013 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... contention, the sd card clock follow the cpu clock, so everything is ... board? Besides, the Spectrum 48K/128K clock is not periodic: it has ... a softcore to regenerate the clock signal from the original ... joystick interface would need a clock to be in phase with ...
    Mp Mp September 2013 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... since I think the toastrack 128K clock doesn't even make TTL ...
    Winston Winston June 2014 Hardware
  • Gyroscope - reverse engineering the 3 title theme tunesHello, Does anyone know if anyone has done any disassembly work on Gyroscope? I'm particularly looking to get the three title tracks back into a …

    ... , I had to recalculate the timing. Different clock-rate and different instructions ... remember how accurate was the timing of the music. Since the ...
    Asimo Asimo April 2021 Assembler
  • You know how the 128K was faster than the 48K Spectrum?Regarding how the Spectrum 128K ran at 3.54 MHz rather than the 48K's 3.5MHz, was this difference enough to be an advantage? If not, then surely Sinc…

    Regarding how the Spectrum 128K ran at 3.54 MHz ... the timing of precise 48K programs when ran on the 128K, and ... added more complexity to the timing routines that ... run on both 48K and 128K machines.
    ewgf ewgf September 2006 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…

    ... *224 (63*228 on 128k) cycles after the ULA ... 48k and 3 cycles on 128k, at least that's ... even 14347 (14364/14368 on 128k). How comes? In either ... as well as correct any timing information stated above. I ...
    C.S.S. 48k/128k [URL="http://www.worldofspectrum.org ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…

    ... bought another ZX Spectrum 128K (heatsink model), but unfortunately ... have some schematics of the 128K heatsink model. Couldn't ... In the analog schematics the clock signal circuit is shown.

    I took another 128K heatsink model, and measured perfect ...
    bverstee bverstee December 2009 Hardware
  • VCF report and photosNot sure where to put this, exactly...but here it is, what went on at the Vintage Computing Festival at Bletchley Park last weekend. Finally I've fo…

    ... shown here running a very timing sensitive demo. Chris's stand ... still: a very early digital clock, built from relays and uniselectors ... fixed one of my dead 128K toastrack machines, fortunately Chris Smith ... resting on top of the 128K machine I had fixed earlier ...
    Winston Winston June 2010 Sinclair Miscellaneous
  • 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…

    ... hackery, I've built a 128K (toastrack) clone. I can't ... semi-correct version detects a 128K machine, and passes both High ... 128K ports?
    2. How does fusetest differentiate between machines through timing ...
    csmith csmith July 2011 Hardware
  • Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…

    ... although 5V, 12V and the clock signal were present.
    So ... , and stopped working after the '128K boot'.
    I then soldered ... up again..
    It worked! 128K menu started, and after plugging ... could the PAL from the 128K heatsink be incompatible with the ...
    bverstee bverstee December 2011 Hardware
  • A 30th Anniversary ProjectHappy new year (belatedly...) So with the 30th anniversary approaching, I've decided to do a hardware project to celebrate it. Something hands-on (o…

    ... AY chip in a 128K machine or the beeper ... that would fit!) The clock for the counters is ... since the Spectrum's clock output gets halted every ... so isn't reliable for timing, at least without making ... in this design). The clock generator will get epoxied ...
    Winston Winston January 2012 Hardware
  • BIFROST* ENGINE with Spectrum 128K support is out!The BIFROST* ENGINE release 1.1 is finally available, now providing also support for all Spectrum 128 models. You can download it from here: [url]ht…

    ... using different delays to compensate timing differences. But in practice, it ... timings between Spectrum 48K, Spectrum 128K/+2, and +2A/+3) and ...
    Einar Saukas Einar Saukas April 2012 Announcements
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... regenerate the Spectrum's clock signal despite contention. However ... 128K's 3.5469MHz signal, in other words our reference clock ... - one counting Spectrum clock cycles since contention started, ... and one counting regenerated clock cycles since contention started ...
    Winston Winston September 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... a repair of a standard 128K a friend of mine handed ... past, this is my first 128K and it really seems I ... draw is about 780 milliamperes. Clock is spot on and has ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... to revive a dead ZX 128K +2 (the grey one).
    clock output that looks like video ... /18/the-adventure-of-the-128k-spectrum-with-no-display/[/url ... there an equivalent for the 128K ?

    Is there a ...
    DenisM DenisM August 2013 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... this testing I tried another clock inverter solution from Ingo ... /> [U]The clock signal on the ZX Spectrum 128K toastrack[/U]
    The clock signal on the ... the 128K toastrack: the signal was weaker than the clock signal ...
    bverstee bverstee September 2013 Hardware
  • 800+ Spectrum 128k & 48k original titles still availableHi guys, The original thread was a bit messy and has vanished from the front page, so rather than bump it, here it is again a bit tidier: All origi…

    ... />
    I also have three 128k units left, all for sale ... Supertest
    Daley Thompsons Supertest 128k
    Daley Thompson's Supertest ... 128k
    Dambusters
    Dan ... 9
    Gregory Loses His Clock
    Grid Iron
    ...
    Kilmannan Kilmannan September 2013 Sales
  • 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…

    ... sure to work on the 128K variants. Turns out I was ... it even throws up timing differences between the 128K and the ordinary ...
    joefish joefish October 2013 Development
  • RS232 on Spectrum 128KDoes anyone actually use the RS232 port on the Spectrum 128K? Is there anything useful that can be done with it? I know about the keypad with the Sp…

    ... RS232 port on the Spectrum 128K? Is there anything useful that ... /> I'm working on a 128K expansion for a Spectrum-like ... % slower than a real Spectrum 128K, and I'm wondering about ... the slightly out of spec clock speed; same could be said ...
    rga24 rga24 May 2014 Hardware
  • Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…

    ... out on my ZX Spectrum 128K +2 and have run out ... using a breadboard.
    - the clock input into the TEA2000 looks ...
    pdj102 pdj102 September 2016 Hardware
  • AY-3-8912 help !Hi all. Happy new yeay. I'm new to spectrum programming, and am interested in writing some music for the +2 AY chip. The problem is...I cant find …

    ... data for every concievable AY clock cycle, and also, a kind ... mode: Start up as a 128K Spectrum, select 128 Basic from ... two. It involves using software timing to update the AY registers ...
    Alcoholics Anonymous Alcoholics Anonymous January 2004 Development
  • Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…

    ... could run the VGA timing from the CPU clock but i will ... support that is in the 128k model. But this was never ... of them with my original 128k (and +2/+3) very easy ...
    pern pern September 2004 Sinclair Miscellaneous
<1234567…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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