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<1234567…34>
  • 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
  • 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
  • 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);
    TheRogue TheRogue September 2011 Announcements
  • 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
  • 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
  • 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
  • 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' ... [/img][/url]

    The CPU /WAIT line is constant high at ...
    Jet5y Jet5y January 2017 Hardware
  • NEC CPU - problem?I wonder if I should substitute a NEC CPU in a grey +2. Does anyone else had problems with NEC CPUs inside ZX Spectrum. Some time ago I had a Spectr…

    ... I should substitute a NEC CPU in a grey +2.< ... divIDE. After substituting the NEC CPU with a Zilog one the ... that works well with a MB02+ until I press a button ... first try to replace the CPU (I would have to ... destroy the NEC CPU while cutting it out).< ...
    ingo ingo February 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
  • 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 …

    ... /+3 halts the Z80 using WAIT?

    All ... mount ULA) uses WAIT to halt the CPU. I haven't ... the scope showing the WAIT signal activity. The Spectrum ... a period of no wait (WAIT signal is high), followed ... bit longer period with high wait activity. Of course, ...
    mcleod_ideafix mcleod_ideafix October 2009 Hardware
  • MB02 picsI got an original MB02 from someone to fix, and of course I made some pics to share (click for magnification): [URL="http://benophetinternet.nl/hobb…

    ... each line of the CPU while MB02+ is in ZX ... to be same as without MB02+?

    Ingo ... />
    If the MB02 ROM is never paged in ... , /IORQ, /RESET, /BUSRQ, /BUSAK, /WAIT, /NMI, /M1, CLK).
    Or ... problem between ZX Spectrum and MB02.

    Am ...
    bverstee bverstee February 2012 Hardware
  • For MB02+ usersI would like to make a list of those people that own the MB02+ interface(including me) on my website. So, anyone who owns one please leave his/her(?)…

    I would like to make a list of those people that own the MB02+ interface(including me) on my website. So, anyone who owns one please leave his/her(?) email on this topic

    Cheers,
    Anestis
    Anestis Anestis June 2003 Sinclair Miscellaneous
  • NEW INTERFACE FOR ZX SPECTRUM!!Hi all zx-maniax! Here is a letter from Polish inventor, Yarek Adamski. He constructed a new brilliant interface for ZX SPECTRUM. Ready carrefuly i…

    ... of computers based on Z80 CPU - e.g. ZX
    Spectrum ... with computers
    of other CPU (6502, 68000), but this is ... -like printer interface.
    - YAMOD.MB02 - is a 8255 PIO with ...
    Yerz Yerz July 2003 Sinclair Miscellaneous
  • MB02 Help!!just got my MB02, is there a way to convert tzx files, etc to MB02 disks?? thanks!

    just got my MB02, is there a way to convert tzx files, etc to MB02 disks?? thanks!
    vanpeebles vanpeebles February 2004 Sinclair Miscellaneous
  • Emulator D80 for MB02+[url="http://speccy.unas.cz/main.html"]http://speccy.unas.cz/main.html[/url] In the url above you can find a screenshot of a piece of software writ…

    ... D80 disk system on the MB02+.
    Does anyone know where ...
    Anestis Anestis May 2004 Sinclair Miscellaneous
  • Emulator for TR-DOS under MB02+Is there such software to allow loading TRD and SCL disk images on MB02+?

    Is there such software to allow loading
    TRD and SCL disk images on MB02+?
    Anestis Anestis July 2004 Sinclair Miscellaneous
  • Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…

    When my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing.

    I know I need to wait about 14300T after interrupt but how can I tell if the ULA is now past the border and onto the screen?
    robpearmain robpearmain September 2004 Development
  • The long waitNot only did we have to wait on our games loading, but had to wait yonks on the mail orders. Thats the thing that really drove my patience. Please …

    ... only did we have to wait on our games loading, but ... had to wait yonks on the mail orders ...
    GeeKay GeeKay October 2004 Games
  • Is there a utility to read TRD disk images from a MB02+ ?I would like to know if anyone has ever come across to a utility that could allow you to load trd images on a mb02 without having to change any of th…

    ... load trd images on a mb02 without having to change any ...
    Anestis Anestis November 2005 Sinclair Miscellaneous
  • Can a CPU emite microwaves? And other questionsSome CPU/electrical questions for the more technical amongst us: 1. Some time back a bloke I knew, whose PC I used to repair, said that he'd read in…

    Some CPU/electrical questions for the more ... PC magazine that when a CPU reached a certain speed (I ... , does that mean that the CPU is in effect drawing more ... XBox 360 console has a CPU with three 3.2 thread ... enough to supprt a 9GHz CPU?
    ewgf ewgf January 2006 Chit chat
  • PC CPU heatsink and fans to cool down Speccy!Ah ha! I've just had an idea! taking apart some scrap PCs I decided to take the CPU heatsink and fan units off and see if I can attach them to the …

    ... I decided to take the CPU heatsink and fan units off ...
    Count Count July 2006 Hardware
  • Will we see a return of the microcomputer?The glory days of the 80's are definitely in the distant, revered past, but I notice that computer makers are marketing more and more ultraportable l…

    ... , even pocket calculators have more CPU power, RAM and ROM that ... we don't have to wait minutes for the computer to ...
    torstum torstum September 2006 Sinclair Miscellaneous
  • MB02+ EmulationWhile I realise that a lot of people don't like it for one reason or another, I'm still a fond user of RealSpectrum. However, for the first time sin…

    ... it's unfortunately in the MB02+ emulation.
    The problem comes ... that provide emulation of the MB02+ Interface? Or any emulators where ... />
    I realise that the MB02+ is semi-redundant these days ...
    icabod icabod November 2006 Emulators
  • Windows Vista & ChessBought Windows Vista Ultimate a few days ago and noticed some things: 1-Finally a game that people can actually play! Chess! Who would have thought …

    ... GPU and not on the CPU.

    4-Regional settings ... time, without forcing you to wait, which is great. Yes, I ...
    Hedegaard Hedegaard April 2007 Chit chat
  • MB02+ troubleI have been using my MB02+ with a +3 power supply for years now. For the last two months I haven't touch my speccy as I had limited free time. Yest…

    I have been using my MB02+ with a +3 power supply ... try to turn on the MB02+ the fuse of the +3 ... then start looking at the MB02+....
    Anestis Anestis July 2007 Hardware
  • real MB02+IDEHi, I just managed to rebuild a MB02+ hardware including HDD-interface to connect IDE devices as CF cards and FDD interface to connect up to 2 HD-fl…

    ... just managed to rebuild a MB02+ hardware including HDD-interface to ... .
    All software made for MB02+ works perfectly because of 100 ...
    ingo ingo October 2007 Hardware
  • Mb02+ideAs I wrote in the hardware forum there will be a small number of a redesigned MB02+IDE (nearly the original MB02+ including IDE interface also for CF…

    ... of a redesigned MB02+IDE (nearly the original MB02+ including IDE interface ... />
    compared to the original MB02+ following changes are made :
    ingo ingo October 2007 Announcements
  • Full throttle CPUHello, I was just wondering: do you experts know if any of the 48K games pushes the Z80 CPU to 100%? I mean, every CPU cycle is used? If so, what's t…

    Hello,
    I was just wondering: do you experts know if any of the 48K games pushes the Z80 CPU to 100%? I mean, every CPU cycle is used?
    If so, what's the game/application?

    B/R,
    Lovespider
    lovespider lovespider December 2007 Sinclair Miscellaneous
<1234567…34>

Latest Posts

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  • Emulator D80 for MB02+[url="http://speccy.unas.cz/main.html"]http://speccy.unas.cz/main.html[/url]<br /> <br /> <br /> In the url above you can find a screenshot of a piec…
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