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<1…18192021222324…34>
  • Machine code help pls: LDI example[deleted]

    ... [/QUOTE]

    yup,
    LDI/LDD
    CPI/CPD
    Fikee Fikee December 2008 Development
  • Dangerous Allram Mode On +2a / +3ZX Spectrum 128+2A and +3 support allram feature on port 1FFD. On this ZX models is very dangerous set allram if is connect any interface with extern…

    ... well known phenomenon of bus-contention.

    This is where ...
    Mark Wills Mark Wills December 2008 Hardware
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... following the cycle requiring the contention to be applied.

    Bob Stains Bob Stains January 2009 Hardware
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... following the cycle requiring the contention to be applied.[/QUOTE]

    Contention would apply when IORQ+A0 ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    [QUOTE=mcleod_ideafix;330315]Contention would apply when IORQ+A0 = ... Tech Info wiki! I/O contention isn't a simple on ...
    Philip Kendall Philip Kendall January 2009 Hardware
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... emulator? If it's not contention, what is it?

    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • Assembler snippetsI was just thinking that a thread for small but useful assembler snippets to do useful things would be cool for people learning z80 coding. Not to me…

    ... the stack or lots of LDI's.
    rich_chandler rich_chandler January 2009 Development
  • Assembler snippetsI was just thinking that a thread for small but useful assembler snippets to do useful things would be cool for people learning z80 coding. Not to me…

    ... the stack or lots of LDI's.[/QUOTE]
    There's ...
    evilpaul evilpaul January 2009 Development
  • Assembler snippetsI was just thinking that a thread for small but useful assembler snippets to do useful things would be cool for people learning z80 coding. Not to me…

    [QUOTE=karingal;330460]The quickest way is probably the longest and using the stack or lots of LDI's.[/QUOTE]

    I remember seeing a piece of code on the forums recently wherein someone made use of the stack pointer to cleverly shift data around.
    Arjun Arjun January 2009 Development
  • Other forums and why they piss me offI was on this site where you can download comics and ended up in the comicbook forum (my blame there) and all of a sudden just because I was giving m…

    ... that people who denied my contention that the word "Paki" is ...
    ewgf ewgf January 2009 Chit chat
  • Hi-colour gamesDoes anyone remember some of the games that used something called Ho-colour? Like the options page on the Agent X games, and a few others. If memory …

    ... know, pentagon has no memory contention (well, I might be totally ...
    Arda Arda January 2009 Games
  • 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…

    the same as ldir version, but with

    m1
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    jp pe,m1
    Shadow Maker Shadow Maker February 2009 Development
  • 25 years with the SpectrumTo paraphrase JFK, ask not what your Spectrum can do for you, but what you can do for your Spectrum. Well I've done quite a bit since I joined the sc…

    ... need to know about memory contention, accurate Z80 emulation, proposed changes ...
    ewgf ewgf February 2009 Sinclair Miscellaneous
  • Component count/modern replacementsThere is a thread/project for replacing the old memory with simms There is also the ULA replacement. There's DEATH's composite replacement. What els…

    ... be compatible with 48K (ram contention), and there is no garantee ...
    roko roko February 2009 Hardware
  • What was the best 16K Spectrum GameOK, I'm putting up a poll, but its not really about the poll, but a chance to focus on the 16K gems. (The poll, taking those with the best WoS rating…

    ... 2 interrupts properly and memory contention slows code down by around ...
    Matt_B Matt_B February 2009 Games
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... cycles between interrupts. The memory contention timings are also different between ...
    joefish joefish March 2009 Development
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... cycles between interrupts. The memory contention timings are also different between ... [1] lets you know your contention pattern[2].

    [1 ...
    Philip Kendall Philip Kendall March 2009 Development
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... you run into the memory contention issues, which means the code ...
    joefish joefish March 2009 Development
  • Detecting Spectrum modelsIs there any sure-fire way a program can detect the model of machine it's running on (48K, +, 128, +2, +2A, +3, clones) even when running in the 48K …

    ... /> Interestingly, the way that the contention works actually serves to regulate ... line. It's having less contention on the +2A that mucks ...
    joefish joefish March 2009 Development
  • Hidden Features In GamesI'm sure there was a thread like this somewhere - sorry, but I can't find it. Hidden stuff in games. In "Mikie" there is a hidden bonus in each of …

    ... first person to use inline LDI/LDDs for a cheap 4 ...
    dougburns dougburns March 2009 Games
  • +2 differences?I know there were a few, but can't find out which would suit my needs best. So, all I need is a unit with a contains a tape deck, and plays pretty…

    ... the grey ones. Only the contention can't be (easily) modified ...
    chev chev March 2009 Hardware
  • Timex 2048 can't see divIDEToday my divIDE with CF adapter arrived. I connected it to my Timex 2048, switched the computer on and nothing happened. I mean "(C) 1982 Sinclair Re…

    ... might be a cause of contention would be the FAT16 format ...
    Zetr0 Zetr0 April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... different to the PAL ULA (contention starts 15 cycles earlier).
    Fred Fred April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... up with a contention tester to check the contention start and pattern ... from Phil's contention testing program ...
    Fred Fred April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... the paper area and the contention pattern.
    Fred Fred April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... 't see them changing the contention pattern either.
    csmith csmith April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... we discover the line the contention starts, then we'll have ...
    csmith csmith April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... screen data and what the contention pattern is.

    Could ...
    zxbruno zxbruno April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... we discover the line the contention starts, then we'll have ...
    Philip Kendall Philip Kendall April 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... hacked some of Phil's contention testing code from fusetest that ... probes the contention pattern at a given tstate ...
    Fred Fred April 2009 Hardware
<1…18192021222324…34>

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