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<1234567…34>
  • Help :) (FLAGS)ok a question about the 8080 so if anybody can help me. do the flags only change for the accumulator or are they affected for the other registers a…

    ok a question about the 8080 so if anybody can help me.


    do the flags only change for the accumulator or are they affected for the other registers as well

    because if you inc b the flags are affected....why?
    ASH-II ASH-II November 2010 Sinclair Miscellaneous
  • A fast DRAW routineI was investigating how to speed up the line drawing for the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20225"]BASIC compiler[/URL]…

    ... on F'
    scf ; which flags ATTR must be updated< ... on F'
    scf ; which flags ATTR must be updated< ... on F'
    scf ; which flags ATTR must be updated< ... on F'
    scf ; which flags ATTR must be updated< ...
    boriel boriel December 2010 Development
  • AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…

    ... , as it only changes the Flags register so I couldn't ... b
    xor a
    scf
    SETBIT: rla
    djnz ...
    Battle Bunny Battle Bunny October 2011 Sinclair Basic
  • Help pleeease "Proving Emulator OpCode flags are correct"So I had a cunning plan... I wanted to write a test harness for Emulators that could "prove" that all opcode flags were correct. I wanted something m…

    ... could "prove" that all opcode flags were correct. I wanted something ...
    Korinel Korinel April 2012 Emulators
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    I can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recently. I have posted the details in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20345"]this ...
    Patrik Rak Patrik Rak November 2012 Emulators
  • Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met. For example, [code] ld a, MODE…

    ... 'm little lost when different flags are set/reset after logic ...
    Bedazzle Bedazzle September 2016 Development
  • I introduce myself and my emulator.Hi! My name is Marta, and I've been a Speccy user for 30+ years now. During the past year I decided to write my own emulator, just to see if I cou…

    ... faithful Z80 emulation (except for SCF/CCF flags)
    - Accurate 48K/128K ...
    TheMartian TheMartian March 2018 Emulators
  • Fuse 1.5.6 releasedA new release of Fuse, the Free Unix Spectrum Emulator, is now available at the SourceForge project: https://sourceforge.net/projects/fuse-emulato…

    ... ]
    [*] Z80 flags register is now correct after SCF and CCF
    Fred Fred August 2018 Emulators
  • Fuse for macOS 1.5.6 ReleasedA new version of Fuse for macOS has been released at the dedicated sourceforge project: https://sourceforge.net/projects/fuse-for-macosx/ Note …

    ... ]
    [*] Z80 flags register is now correct after SCF and CCF (Sergio ...
    Fred Fred August 2018 Emulators
  • How are LAST-K and FLAGS set on a Real Spectrum?Hi, I'm writing a Spectrum emulator and I've got Horace and the Spiders working (with the wrong colours and no sound) but when I boot into ROM non…

    ... ROM uses bit 5 of FLAGS and LAST-K to work ... far as I can tell, FLAGS and LAST-K aren't ...
    garethadams garethadams January 2019 Emulators
  • Zero v0.8Pigs can apparently fly because it's the v0.8 update of Zero that no one asked for but is out for public consumption anyway. Grab it [url="https:/…

    ... (ZJoyKiller, Ped7g).
    - Fixed SCF and CCF flags for undocumented behaviour (ZJoyKiller ...
    Arjun Arjun January 2022 Emulators
  • The new GP2Xpectrum releases threadYeah, I know the thread title isn't exactly too original, but I've decided that just one post to hold all updates makes more sense than a lot of smal…

    ... Exerciser[/URL], and fixed several flags bugs, a bug I've ... /> - Fixed flags behaviour for several instructions: BIT*, CPI, SBC & SCF.
    Metalbrain Metalbrain December 2006 Emulators
  • 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…

    According to the [URL=http://www.mdfs.net/Software/Z80/Exerciser/Spectrum/]Z80 Exerciser[/URL], some flags are wrong.

    The failed tests are:
    hl,
    add hl,
    add ix,
    add iy,
    bit n,
    Metalbrain Metalbrain December 2006 Emulators
  • 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…

    ... /Spectrum/]Z80 Exerciser[/URL], some flags are wrong.

    The ...
    Dunny Dunny December 2006 Emulators
  • 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…

    ... out to be related to flags 5 and 3, so they ...
    Metalbrain Metalbrain December 2006 Emulators
  • Minigame Compo 2007Hi there, also this year, there'll be a minigame competition, open to all 8-bit computers and consoles. It consists on writing games whose size (…

    ... , ADC HL,HL provides correct flags
    jp z, start
    SCF at init)

    getbit ...
    Fikee Fikee January 2008 Development
  • *The* Sinclair Knowledge baseOk, get ready for a long post. :p Let's consider a few facts: -The WOS ftp has thousands of important files, but it can be difficult to find what w…

    ... /wiki/Z80#Additional%20information]undocumented flags after SCF and CCF[/url] is ...
    Philip Kendall Philip Kendall August 2008 Sinclair Miscellaneous
  • which is the best?Hello, Since RealX is not coming out in the near times (realSpectrum was my favorite emulator) Can anyone point me a good one to replace it??? Som…

    ... excluding here: anything involving undocumented flags after SCF/CCF (as we don ... 't know how that works), undocumented flags ...
    Philip Kendall Philip Kendall September 2008 Emulators
  • which is the best?Hello, Since RealX is not coming out in the near times (realSpectrum was my favorite emulator) Can anyone point me a good one to replace it??? Som…

    ... excluding here: anything involving undocumented flags after SCF/CCF (as we don ... 't know how that works), undocumented flags ...
    Dr BEEP Dr BEEP September 2008 Emulators
  • Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…

    [QUOTE=Dunny;302899]No, but we now know a very great deal about the internals. I'd challenge anyone to write a program that runs differently on the real thing than on say, SpecEMU[/QUOTE]

    Easy. Undocumented flags after SCF/CCF.
    Philip Kendall Philip Kendall September 2008 Emulators
  • Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…

    ... =Philip Kendall;302902]Easy. Undocumented flags after SCF/CCF.[/quote]

    flags behaviour running the same code ... from a real machine using SCF/CCF as long as the ...
    Woody Woody September 2008 Emulators
  • Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…

    ... =Philip Kendall;302902]Easy. Undocumented flags after SCF/CCF.[/quote]

    flags' settings, or am I missing ...
    ewgf ewgf September 2008 Emulators
  • Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…

    [quote=ewgf;302934][SCF/CCF]
    Oh right. Isn' ... these operations and record the flags' settings, or am I missing ...
    Woody Woody September 2008 Emulators
  • Interlace demoSorry to reference another thread like this, but in the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?p=313428#post313428[/url] …

    ... Z80 emulation: MEMPTR and undocumented flags after SCF/CCF.
    Philip Kendall Philip Kendall November 2008 Sinclair Miscellaneous
  • Interlace demoSorry to reference another thread like this, but in the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?p=313428#post313428[/url] …

    ... Z80 emulation: MEMPTR and undocumented flags after SCF/CCF.[/quote]

    You've explained about the flags before ...
    ewgf ewgf November 2008 Sinclair Miscellaneous
  • Saboteur replaysI can't seem to be able to play the Saboteur replays as available in [url]http://www.rzxarchive.co.uk/s.php#saboteur[/url]. Both Spectaculator and Z…

    ... of the undefined flags after bit n,(hl) or scf/ccf is ...
    Patrik Rak Patrik Rak December 2008 Emulators
  • Saboteur replaysI can't seem to be able to play the Saboteur replays as available in [url]http://www.rzxarchive.co.uk/s.php#saboteur[/url]. Both Spectaculator and Z…

    ... of the undefined flags after bit n,(hl) or scf/ccf is ...
    Pavero Pavero December 2008 Emulators
<1234567…34>

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  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
  • Help :) (FLAGS)ok a question about the 8080 so if anybody can help me.<br /> <br /> <br /> do the flags only change for the accumulator or are they affected for the…
  • Help pleeease "Proving Emulator OpCode flags are correct"So I had a cunning plan... I wanted to write a test harness for Emulators that could "prove" that all opcode flags were correct. I wanted something m…
  • norton flags wos as 'suspect'Norton security gives me a 'suspect' message when I'm on wos, looked into it and got this report.<br /> <br /> [img]http://i62.tinypic.com/2rhpky9.…
  • Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met.<br /> <br /> For example,<br /> [code]…
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