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<1234567…34>
  • My attempt to restore the CPU clock signalI know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results. I'm not taking…

    ... /> Having a CPU in-phase clock signal is needed ... is the restored CPU signal clock, with the ... same phase as seen by the CPU ... itsef, i.e, it's inverted with respect to the clock ... , // 28MHz input master clock
    input wire cpuclk_in_n ...
    mcleod_ideafix mcleod_ideafix September 2014 Hardware
  • New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…

    ...
    With the new CPU and Spectranet connected, the Spectrum ... is attached to the CPU's clock input. I can ... capacitor between 0V and the clock input.

    ... rising edges of the clock. I assume this must ... enough. Maybe the new CPU type latches the value ...
    Zorn Zorn June 2013 Hardware
  • DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…

    ... stopped clock for CPU.
    DMA clock is same as for CPU, thus DMA wait ... . On ZX 128+2A/+3
    ula generate WAIT ... for CPU. DMA work on any ULA ...
    velesoft velesoft March 2007 Hardware
  • DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…

    ... stopped clock for CPU.
    DMA clock is same as for CPU, thus DMA wait ... . On ZX 128+2A/+3
    ula generate WAIT ... for CPU. DMA work on any ULA ...
    velesoft velesoft March 2007 Hardware
  • Gauging interest: ZX EvolutionHi everyone. First of all I would like to introduce myself, since this is my first post. My name is Conrad, I'm from Vancouver, BC, Canada, and I hav…

    ... mode without CPU wait states)/ 14 MHz (mega turbo with CPU wait states);
    * Real-time clock.

    When shipped, the ...
    TheRogue TheRogue September 2011 Announcements
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    What is the CPU clock signal (on pin 5) like?
    And also the CPU /WAIT signal? It should be high.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK January 2017 Hardware
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    The CPU clock looks like this, I'm ... [/img][/url]

    The CPU /WAIT line is constant high at ...
    Jet5y Jet5y January 2017 Hardware
  • VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…

    The Z80 mnemonic HALT lets the CPU wait until VSYNC (or Interupt) before allows the program continuation.
    LCD LCD May 2004 Development
  • Hardware section....Wonder why here is no specific hardware forum??? No one ever touched a soldering iron here? (o; I'm kinda lost here with my hardware stuff under: "…

    Yepp..just plain resistor network for VGA...

    I use internal PLL with 2 seperate outputs for CPU/VGA clock.
    klingler klingler July 2004 Sinclair Miscellaneous
  • Hardware section....Wonder why here is no specific hardware forum??? No one ever touched a soldering iron here? (o; I'm kinda lost here with my hardware stuff under: "…

    ... CPLD, any ideas for the clock "problem" ? ;)

    I could ... with 2 seperate outputs for CPU/VGA clock.
    [/quote]

    pern pern July 2004 Sinclair Miscellaneous
  • 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 CPU be stalled during T2 (and TW for IO) using ~WAIT ... ?[/QUOTE]

    Ignore the CPU ~WAIT signal - You [B]cannot[/B ...
    csmith csmith September 2007 Emulators
  • CPU question about various emulators for and on various machinesRight, you know how nowadays the latest CPUs seem to be dual (or more) core 2.4GHz (or whatever speed) as opposed to, say, single core 5.8GHz? Now I …

    ... for more cores over faster clock, but that is not ... chip to achieve the desired clock without overheating. The really ... What CPU is in the laptop? You can't compare clock speeds ... of different CPU architectures. Clock for clock a Core2 ...
    JamesW JamesW March 2008 Emulators
  • CPU question about various emulators for and on various machinesRight, you know how nowadays the latest CPUs seem to be dual (or more) core 2.4GHz (or whatever speed) as opposed to, say, single core 5.8GHz? Now I …

    ... for more cores over faster clock, but that is not ... chip to achieve the desired clock without overheating. The really ...

    [quote]
    What CPU is in the laptop?[/quote ... 't compare clock speeds of different CPU architectures. Clock for clock a Core2 ...
    ewgf ewgf March 2008 Emulators
  • Spectrum to Amiga emulationIs there an emulator I can install on my Amiga that will play tzx and tap files from the WOS archive? I cannot find one but wonder if anyone here can…

    ... GB HD.[/quote]
    What CPU and clock speed?
    Laser Laser July 2008 Emulators
  • Spectrum +2 datacorderHi, my Spectrum +2 datacorder isn't working. Does anyone know if I can still load software through the tape/sound socket at the back of the machine i…

    ... not drive the CPU with clock signal. The input clock of the ULA ...
    ingo ingo September 2009 Hardware
  • Spectrum +2 datacorderHi, my Spectrum +2 datacorder isn't working. Does anyone know if I can still load software through the tape/sound socket at the back of the machine i…

    ... not drive the CPU with clock signal. The input clock of the ULA ... try one thing. Take the clock signal and make a circuit ... are lucky, only output pin clock of the ULA is broken ... that ULA dodn't give clock signal for AY-8912 and ...
    Jose_Leandro Jose_Leandro September 2009 Hardware
  • Spectrum +2 datacorderHi, my Spectrum +2 datacorder isn't working. Does anyone know if I can still load software through the tape/sound socket at the back of the machine i…

    ... try one thing. Take the clock signal and make a circuit ... are lucky, only output pin clock of the ULA is broken ... doubt that in case the CPU had clock the computer would work ...
    ingo ingo September 2009 Hardware
  • Spectrum +2 datacorderHi, my Spectrum +2 datacorder isn't working. Does anyone know if I can still load software through the tape/sound socket at the back of the machine i…

    ... doubt that in case the CPU had clock the computer would work ... see if your ULA gives clock for TEA2000? It's the ...
    Jose_Leandro Jose_Leandro September 2009 Hardware
  • Faulty +2 advice please :)Hi all , I have a faulty +2 which when powered up gives a black border and 6 black and White stripes , I'm thinking faulty ram ??? Any one have any b…

    ... as it powers the clock for the CPU (no clock = no activity, of ... on a 48K). Check the clock signal if you can and ...
    Spirantho Spirantho March 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... . I confirmed that that CPU's clock was still present and so ...
    Zorn Zorn October 2012 Hardware
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... +2A/+3 not exist and CPU wait in neverending cycle. Games can ...
    velesoft velesoft December 2012 Games
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... +2A/+3 not exist and CPU wait in neverending cycle. Games can ...
    Metalbrain Metalbrain December 2012 Games
  • New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…

    ... Spectrum board when a CMOS CPU is used. I've tried ... a 47pF capacitor between the CPU's clock input pin and 0V ...
    Zorn Zorn July 2013 Hardware
  • Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…

    ... RAM is used for CPU stack, CPU cannot work correctly if RAM ... used years ago employing the CPU WAIT signal. It allows you to ... halt CPU at certain times and make ...
    Jimmy Falcon Jimmy Falcon May 2014 Hardware
  • Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…

    ... ? does the ULA halt the CPU clock in the normal way if ... the DMA controller from that clock line, or do you have ... the RAM access with the CPU's clock signal and to set ... the same way as the CPU would, then the ULA would ... just as it would the CPU.
    Zorn Zorn November 2014 Hardware
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... +2A/+3 not exist and CPU wait in neverending cycle. Games can ...
    Alessandro Grussu Alessandro Grussu March 2016 Games
  • Spectrum 48k Clock SpeedSo I was reading the [url="http://www.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrum48K_ServiceManual.pdf"]Spectrum 48k Service Manaul[/u…

    ... single-IC central processing unit (CPU). It is
    clocked at ... -IC central processing unit (CPU). The clock is derived from a 14 ... yes, for uncontended cycles, the clock is 3.5MHz approx.
    1024MAK 1024MAK February 2017 Hardware
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    General for all 8 bit CPU systems:-
    If the ... are okay, give the CPU a clock and a ROM chip, ... a "ULA") generates the CPU clock. But is this getting to ... the CPU?

    Is the CPU being held ... br />
    Does the CPU have power on it's ...
    1024MAK 1024MAK October 2017 Hardware
  • Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …

    ... ULA) uses WAIT to halt the CPU. I haven' ... the scope showing the WAIT signal activity. The Spectrum ... a period of no wait (WAIT signal is high), followed ... longer period with high wait activity. Of course, ... a Z804020 CPU (Z80 capable of 20MHz clock), isolate the ...
    mcleod_ideafix mcleod_ideafix October 2009 Hardware
  • How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…

    ... we'll run out of CPU time, for handling all of ... into the "control register", and wait for the CPU1 to clear ... able to write into the CPU registers AF, BC, DE, IX ...
    wilsonsamm wilsonsamm June 2009 Hardware
<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

HitBox

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cpu 6.7K 10K
wait 12.3K 13.6K
clock 3.1K 4.7K

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