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<1…18192021222324…34>
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... /+3 models use different memory contention, ports adressation and ram pages ...
    velesoft velesoft December 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    but didn't Andrew choose the +2a as the basis because the memory contention is in the right place?
    BiNMaN BiNMaN December 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... the basis because the memory contention is in the right place ... sinclair manual.
    The +3 contention is built to the specifications ...
    guesser guesser December 2010 Hardware
  • The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…

    ... sinclair manual.
    The +3 contention is built to the specifications ... seen the effect of memory contention being in the wrong place ...
    BiNMaN BiNMaN December 2010 Hardware
  • What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3

    ... has the correct 128 memory contention. There are a lot of ...
    chev chev December 2010 Hardware
  • What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3

    ... has the correct 128 memory contention. There are a lot of ...
    Chris A Chris A December 2010 Hardware
  • What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3

    ... at a technical level the contention on this model is so ...
    nuggetreggae nuggetreggae December 2010 Hardware
  • What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3

    ... at a technical level the contention on this model is so ...
    chev chev December 2010 Hardware
  • What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3

    ... has the correct 128 memory contention. There are a lot of ...
    velesoft velesoft December 2010 Hardware
  • What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3

    ... being written for the page contention of the +2A rather than ... the +2A has the page contention that Sinclair *said* the original ... don't fix the page contention issue. They're also pretty ...
    chev chev December 2010 Hardware
  • Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…

    It'll run particularly slow to be honest ;)
    Move the code up in memory (>=32768 ) to avoid memory contention.
    Woody Woody December 2010 Development
  • Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…

    ... (>=32768 ) to avoid memory contention.[/QUOTE]
    But the only ...
    trellis trellis December 2010 Development
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... gonna lose a lot to contention. Unless the CPU is fast ...
    Winston Winston December 2010 Hardware
  • Spectaculator... is it worth the money?Hi Folks, This is a genuine request for feedback. I have used the demo version of Spectaculator and it seems a very good Spectrum emulator. Lots o…

    ... speed. Maybe its an inaccurate contention issue, maybe IY or IX ...
    nuggetreggae nuggetreggae December 2010 Emulators
  • Xmas / NY present for all ZX UsersHi there, wasn't sure where this should go, but this is a couple of years "work" during free time while not in the office. This is a package of 480 o…

    ... has a different contention pattern and no contention on ports so a ...
    nuggetreggae nuggetreggae December 2010 Development
  • NEW! Poll Best Spectrum game from 2010 - Everybody vote here please -OK, so since there were several releases after the day I posted the original Poll, I would post this new one to include all the games from 2010. Eve…

    ... has been a point of contention and you can't please ...
    Arjun Arjun January 2011 Games
  • Converting TRD-Dos into TapHello, there are still many programs appearing on TRD-Dos or SCL format and users of normal Spectrum cannot run them. Of course I know about emulator…

    ... many clones had no memory contention and related problems, and also ...
    Shiru Shiru January 2011 Development
  • How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…

    ... is the source of the contention delays when reading or writing ...
    wozname wozname January 2011 Hardware
  • How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…

    ... conflict and this is called contention. By having a physically separate ... 32k without any worries of contention. That's why the top ...
    Alcoholics Anonymous Alcoholics Anonymous January 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    [QUOTE=BiNMaN;504855]so memory contention on the toastrack and the ...
    velesoft velesoft January 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    So the question for games not running properly is not that the CPU contention timing is different, but that contention is applied differently to memory banks on the toastrack/+2 and the +2a/b/3.

    Which runs the most games?
    csmith csmith January 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... is not that the CPU contention timing is different, but that ... contention is applied differently to memory ...
    BiNMaN BiNMaN January 2011 Hardware
  • contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …

    ... is not that the CPU contention timing is different, but that ... contention is applied differently to memory ... /+2B, or written assuming the contention in the manual will work ...
    guesser guesser January 2011 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... to slow down CPU anymore. Contention is missing but should be ...
    kpuchatek kpuchatek February 2011 Hardware
  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …

    ... 0,0 bit of the contention pattern.
    Philip Kendall Philip Kendall February 2011 Development
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... (already overclocked) and simplified memory contention scheme - afaik all memory was ... (some utilising Z80s) suffered less contention, but this led to significant ...
    TVzombie TVzombie February 2011 Sinclair Basic
  • A thousand core CPU?Maybe this is old news to most people on here, but according to: [url]http://www.zdnet.co.uk/news/emerging-tech/2010/12/25/intel-why-a-1000-core-chi…

    ... to be some shared resource contention going on. It's a ...
    Winston Winston February 2011 Chit chat
  • A thousand core CPU?Maybe this is old news to most people on here, but according to: [url]http://www.zdnet.co.uk/news/emerging-tech/2010/12/25/intel-why-a-1000-core-chi…

    ... to be some shared resource contention going on. It's a ...
    ewgf ewgf February 2011 Chit chat
  • ZX Poly - wow!Hi Folks, Came across the following: [url]http://www.igormaznitsa.com/zxpoly/zxpoly.html[/url] Has anyone else seen this before? I am no hardware…

    ... it would fit around the contention of the Z80/ULA or ...
    sack sack February 2011 Hardware
  • A thousand core CPU?Maybe this is old news to most people on here, but according to: [url]http://www.zdnet.co.uk/news/emerging-tech/2010/12/25/intel-why-a-1000-core-chi…

    ... apples vs oranges here - my contention is that the XBox runs ...
    ewgf ewgf February 2011 Chit chat
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  • Z80 cycle contentionHi,<br /> Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?<br /> I mean which Z80 clock cycle, T1 or T2?<br /> …
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  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ:<br /> <br /> instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b]<br /> and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b]<br /> …
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  • BIT b,(ii+n) contentionThe documentation says that BIT b,(ii+n) has this contention pattern:<br /> <br /> pc+1:4,pc+2:3,pc+3:3,pc+3:1 x 2,ii+n:3,ii+n:1<br /> <br /> See [ur…

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