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<1234567…34>
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... refresh (e.g. RAS only) cycles refresh a row but also ... a read cycles are.
    Normally CPU reads ... are no any additional refresh cycles (or there is no need ...
    brian-82 brian-82 November 2007 Development
  • A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…

    ... -check my understanding of M1 cycles inside the Z80.

    ajmoss ajmoss June 2010 Development
  • The Cycles Disk, stuck on picture of bike and bottom of screen is blue?Have a Loose Disk of The Cycles by Accolade, made a DSK from it and loaded it in Spectaculator but it sticks on a screen that just shows a bike at th…

    ... a Loose Disk of The Cycles by Accolade, made a DSK ...
    BarryB BarryB June 2018 Games
  • Z80 opcode breakdownAnyone knows if there's a document on the net covering all the Z80 instruction breakdown by machine cycles? All I could find was that one on the Z80…

    ... Z80 instruction breakdown by machine cycles?

    All I could ...
    Cesare Falco Cesare Falco March 2003 Emulators
  • Entire Sinclair Software Collection For Sale - Built Up Since 1988!Sinclair Spectrum Software For Sale Information below includes the title of the software, the type of media it is supplied on and the price. I can a…

    ... /> ?2.50

    The Cycles (Accolade ? 1988)

    48K ...
    retrogod retrogod March 2004 Sales
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... divides every opcode into M-cycles; each M-cycle is one ... INC (HL) has three M-cycles:

    * M1: 4 tstates ... data bus, it takes 12 cycles to get to 'n':
    cycles:

    * M1: 6 tstates ...
    Philip Kendall Philip Kendall July 2004 Development
  • Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…

    ... is broken down (in machine cycles) as follows (according to Microprocessor ...
    GOC GOC September 2004 Development
  • How can I see how long it took for IM2 to runHow can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken…

    How can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken from entering the IM2 routine to RETI
    robpearmain robpearmain October 2004 Development
  • ANN: Tipshop updated Tuesday, 14 December 2004Tuesday 14 December 2004 I've FINALLY (hopefully?!?!) got caught up with stuff, so here's a fairly big update, with a distinctly mappy feel! * I do…

    ... Strikes Back , Chiron ,
    Crozet , Cycles, The , Dangerous Kiss ,
    Fernandez ...
    hackersanon hackersanon December 2004 Announcements
  • help me identify this TYPE-IN for the Spectrum back in '83I've had an amazing time downloading some of the type-ins on this site and bring back lots of fantastic memories (I can still remember typing in Stas…

    ... grid inside it. The light cycles themselves were made up of ...
    DaxTrajero DaxTrajero July 2005 Games
  • TRDOS ReCracks Batch 3Hi All ! The third batch of the TRD Hacks converted to .TAP (and .Z80 in some cases) format is here. This time mostly games with starting letters B-…

    ...
    Cybex+1.tap
    Cycles.tap
    DarkMan+M_128.tap ...
    Tom-Cat Tom-Cat August 2005 Games
  • Old emulators on DOSBOX.Sadly, my Win'98 machine is going loco a bit too often. I've finally decided that I'll have to move everything over to the noisy, underused XP machi…

    ... run at 100% in 4000 "cycles". With all the speedups off ... at 100% in 8000-9000 cycles.

    Well within the ... it, but the number of cycles required to get that to ...
    Jmk Jmk November 2005 Emulators
  • Tron !!!I remember playing this game down the arcades when i was a kid and spending most of my pocket money on it ! It was released as a game but i cant reme…

    ... can rememer is the light cycles and shooting spider things that ...
    mcjoecool mcjoecool May 2006 Wanted
  • Lethargy and EggHead4 trained ...Hey all. Seeing that not many of you have heard of the great NEW game Lethargy I thought I would do a re-crack of it from TR-DOS which was trained b…

    ... intro needs a few more cycles than normal speccy can provide ...
    Tom-Cat Tom-Cat July 2006 Games
  • ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…

    ... , after a lengthy few testing cycles, I'm taking the plunge ...
    Dunny Dunny December 2006 Emulators
  • Little Britain the Computer Game wouldnt be out of place on the speccyI was told that a little britain was coming out on the PC/PS2 and had a search and it is indeed. After reading what its about it is in fact just 8 m…

    ... trademark tight fitting outfit, Daffyd cycles down the Llandewi Breffi high ...
    festershinetop festershinetop January 2007 Chit chat
  • I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…

    ... whole
    T2 and Tw cycles)
    During _reading_ from ULA ...
    brian-82 brian-82 February 2007 Development
  • Possibly a little OT: Exporting ROM function addresses to the Z88DKOK, so I'm using the Z88DK. It's entirely possible that some documentation has bypassed me. But assume I have a function in ROM, say, at address 0xF0…

    ... desperately inefficient in both CPU cycles, memory, and my time (especially ...
    Winston Winston April 2007 Development
  • LiberatedI was just browsing around at "stuff" and spotted the [URL=http://www.worldofspectrum.org/infoseekid.cgi?id=1000227]Liberator[/URL], a hardware wotsi…

    ... routine that ate up clock cycles before running the real IM1 ... to, again, eat up clock cycles?
    I would guess that ...
    icabod icabod May 2007 Hardware
  • What is the term......for a device which monitors a set of computers (via ping or whatever) and, if a computer is unresponsive, power cycles that computer (effectively …

    ...for a device which monitors a set of computers (via ping or whatever) and, if a computer is unresponsive, power cycles that computer (effectively pulling out the plug and plugging it back in again)?
    NickH NickH May 2007 Chit chat
  • Armagetron Advanced -- where is the moviepack?I've downloaded Armagetron Advanced (a brilliant open-source Light Cycles game for several platforms -- Windows in my case). Trouble is, the distro …

    ... (a brilliant open-source Light Cycles game for several platforms -- Windows ...
    robert@fm robert@fm June 2007 Chit chat
  • Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…

    Snipped from the complete spectrum ROM disassembly:
    [CODE]
    Now the memory is checked.

    11DA RAM-CHECK LD H,D Transfer the value in DE
    LD L,E (START = +FFFF, NEW =
    wilsonsamm wilsonsamm August 2007 Sinclair Miscellaneous
  • WOS Forums NNTP gateway: SSL supportPeople using the [url=http://matt.west.co.tt/ruby/bbgateway/]NNTP gateway[/url] at news.zxdemo.org to read WOS Forums on their newsreader may be inte…

    ... (and save me some CPU cycles).
    gasman gasman August 2007 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…

    ... (63*228 on 128k) cycles after the ULA has pulled ... (which lasts for 32 cycles and the Z80 can generate ... applying the contention a few cycles earlier, namely 1 cycle ... on 48k and 3 cycles on 128k, at least ... appear on the bus several cycles later. The sources differ ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • DJNZ e ProblemI'm trying to write the DJNZ e instruction as part of the development of my emulator and can't get it to work. Here is the in and out states of Phil…

    ... 't jump - just update the cycles
    cyclesRemaining = cyclesRemaining - 2
    PC = PC + offset

    // Cycles
    cyclesRemaining = cyclesRemaining - 3
    MadDoc MadDoc June 2008 Emulators
  • "Floating" AY registersWhile I was working on some AY sample-related stuff, it occurred to me that with the AY port not being completely decoded, it would be a handy CPU-ti…

    ... few tens of thousands of cycles before they decay to zero ...
    gasman gasman December 2008 Hardware
  • BASin Assembler suggestionsHi Dunny. According to your former request here goes a few suggestions. Been playing around with the Assembler and I'm glad I did. Quite nice indeed…

    ... column displaying the instruction clock cycles
    [*]At the bottom of ...
    rahtgaz rahtgaz January 2009 Emulators
  • ZXCF conundrumsBefore I start spending time prodding my ZXCF, I ought to ask... Anyone else have problems with the ZXCF losing its memory between power cycles? I'v…

    ... losing its memory between power cycles? I've checked the obvious ... about one in four power cycles.

    Is there something ...
    Winston Winston January 2009 Hardware
  • Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…

    ... bytes and whopping 145163 T cycles, if I have computed it ...
    Patrik Rak Patrik Rak February 2009 Development
  • DRAM without powerSomething interesting I noticed last night, after making a bad Spectranet ROM image which crashed the machine... Looking at the image on the screen,…

    ... maximum time between DRAM refresh cycles. Perhaps the values quoted are ...
    Winston Winston May 2009 Hardware
<1234567…34>

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Related Threads

  • Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly:<br /> [CODE]<br /> Now the memory is checked.<br /> <br /> 11DA RAM-CHECK LD H,D …
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone.<br /> <br /> I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where …
  • A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction.<br />…
  • The Cycles Disk, stuck on picture of bike and bottom of screen is blue?Have a Loose Disk of The Cycles by Accolade, made a DSK from it and loaded it in Spectaculator but it sticks on a screen that just shows a bike at th…

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