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  • Has any programmers recently pushed the spectrum to the limits?Hi there. Ive just discovered this great forum and I was brought up with the speccy 16,48 and then 128k. Im just wanting to know if there are any re…

    ... ; Hit here just as the contention-free period starts - start pushing ...
    AMW AMW August 2009 Development
  • Should I buy a Sam Coupe?Hi folks I been interested with the Sam Coupe since Miles Gordon Technology released the SAM as the successor to the Spectrum. Are their any SAM us…

    ... ]

    Due to memory contention while the video is being ...
    Quazar Quazar August 2009 Chit chat
  • Should I buy a Sam Coupe?Hi folks I been interested with the Sam Coupe since Miles Gordon Technology released the SAM as the successor to the Spectrum. Are their any SAM us…

    ... =Quazar;376976]Due to memory contention while the video is being ...
    chev chev August 2009 Chit chat
  • Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…

    ... constraints (Z80 undocumented opcodes, memory contention, floating bus, fixed number of ...
    Madonna Mk 2 Madonna Mk 2 August 2009 Development
  • Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…

    ... threw at it (floating bus, contention, whatever), then, to me, that ...
    csmith csmith August 2009 Development
  • Colour clash on the Commode64?Was there any? Every now and again, I see a screen shot like this... [img]http://www.lemon64.com/games/screenshots/full/j/jack_the_nipper_02.gif[/i…

    ... a lot more predictable) memory contention.
    AndyC AndyC September 2009 Chit chat
  • Colour clash on the Commode64?Was there any? Every now and again, I see a screen shot like this... [img]http://www.lemon64.com/games/screenshots/full/j/jack_the_nipper_02.gif[/i…

    ... a lot more predictable) memory contention.[/QUOTE]

    Didn't ...
    frobush frobush September 2009 Chit chat
  • Colour clash on the Commode64?Was there any? Every now and again, I see a screen shot like this... [img]http://www.lemon64.com/games/screenshots/full/j/jack_the_nipper_02.gif[/i…

    ... a lot more predictable) memory contention.[/QUOTE]
    Really? I never ...
    rich_chandler rich_chandler September 2009 Chit chat
  • 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 …

    ... not suffer any kind of contention. A program run within the ...
    mcleod_ideafix mcleod_ideafix October 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 …

    ... the BBC Micro worked without contention was interesting. The 6502, if ...
    Winston Winston October 2009 Hardware
  • Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…

    hmmm, if your RAM was bad, it'd probably hang on boot when it does a check.

    It looks a little like the kind of problems you'd expect with RAM contention problems? You got a spare ULA you can swap out to eliminate that as the cause?
    Andy Severn Andy Severn October 2009 Hardware
  • Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…

    ... , no INK change) so ULA contention issue would surely make black ...
    nuggetreggae nuggetreggae October 2009 Hardware
  • AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…

    ... identical Spectrums, the amount of contention is very consistent over time ...
    BloodBaz BloodBaz October 2009 Hardware
  • AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…

    ... identical Spectrums, the amount of contention is very consistent over time ...
    gasman gasman October 2009 Hardware
  • Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…

    ... to access it (known as contention). Having the display file memory ...
    Alcoholics Anonymous Alcoholics Anonymous November 2009 Development
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... think it'll need a contention cycle if the ULA is ...
    Winston Winston November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... ULA port, with the same contention as the existing ULA port ... is significantly easier to handle contention etc (of which there will ... reason for this is handling contention on the palette RAM. This ... update the palette will cause contention, so to avoid issues, ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... is significantly easier to handle contention etc (of which there will ...
    Winston Winston November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... get the port issue sorted - contention information (with high accuracy) will ... know how this will affect contention. ULA contention on even ports is ...
    Dunny Dunny November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... was trying to determine the contention timing for you all ;-)< ... speccy, then no problem. No contention.

    If the ... ink and paper colours. Eeek! Contention.

    [b]Border ... relies on a particular palette contention model and access timing (ie ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... updates, as there will be contention to deal with in the ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... changed, and there will be contention somewhere. That's all.
    contention excepted), or very shortly afterwards ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... pixel display area to avoid contention with you wonderful chaps who ... , because we want to avoid contention with the palette updates. Loading ... if we want to avoid contention. Doing so when the CPU ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... pixel display area to avoid contention with you wonderful chaps who ...
    joefish joefish November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... -scanline and its affect on contention. My question then is, do ...
    Arjun Arjun November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... -scanline and its affect on contention. My question then is, do ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... would mean implementing a second contention model for the new ula ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... early stage of development, and contention timing. Everything else about the ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... learn and work with the contention and timing, and just trust ...
    joefish joefish November 2009 Emulators
  • just thinking about ...compo for zx 16k ? anyone ?

    You could call it the Contention Competition, since all the lower ...
    chev chev November 2009 Development
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