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Search Again :: Adv Search 1000 results in 0.003s
<1234567…34>
  • Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…

    ... the Z80. It fixes a contention problem (basically all I/O ... activating and causing some random IO function to be activated (hence ... perfectly (well, now with incorrect IO contention due to the absence of ... ULA to sometimes see spurious IO requests, causing the odd ...
    Winston Winston December 2013 Hardware
  • Border emulationHow is the border emulated to do all the fancy little tricks such as in Aquaplane? I've got some basic border emulation working but it only displays…

    ... emulation of memory (and possibly IO) contention is required. Without it, the ... /> You can read about memory contention [URL="http://www.worldofspectrum.org ...
    micapolos micapolos May 2007 Emulators
  • Border emulationHow is the border emulated to do all the fancy little tricks such as in Aquaplane? I've got some basic border emulation working but it only displays…

    ... emulation of memory (and possibly IO) contention is required. Without it, the ... /> You can read about memory contention [URL="http://www.worldofspectrum.org ... ,
    Michal.[/quote]
    Thanks. Contention is another thing I'm ...
    rich_chandler rich_chandler May 2007 Emulators
  • 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…

    ... answer why this slight IO contention difference does not affect ... I]

    [CODE]14336 IO Contention Starts
    14337 -
    14341 IO Contention End, Border finish, 1st ... pixels output
    14349 IO Contention End, Display byte 4 ...
    csmith csmith September 2007 Emulators
  • 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…

    ... /> [QUOTE]The timing of the IO contention however is different. Again 6 ... not affected by contention, neither memory nor IO, so the contention is fortunately ... .

    [QUOTE]If the IO contention was the same as memory ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... hunch about the 14335: If IO contention was assumed to be the ... />
    [QUOTE]"[I]IO contention is different from memory contention[/I] ......" Now this ... fetched during contended IO.

    Thus the IO contention I describe must ...
    csmith csmith September 2007 Emulators
  • 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…

    ... T3 of the instruction the IO read or write occurs.[/QUOTE ... , the smart thing about the IO contention is the idea to contend ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... Chris pointed out, the IO contention and Memory contention differ. So the ... and the other one due IO contention pattern? The first one ... t be certainly contended by IO contention, as IOREQ is not ... the second cycle contended due IO contention and the #7FFF gets ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... pointed out, the IO contention and Memory contention differ. So the ... and the other one due IO contention pattern?[/QUOTE]

    IO contention pattern.

    MREQ ... t be certainly contended by IO contention, as IOREQ is not ...
    csmith csmith September 2007 Emulators
  • 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…

    ... and otherwise it is the IO contention pattern.

    MREQ [ ... to do with choosing which contention pattern (because the ULA ... blog. However it takes the IO contention table as a matter of ... assumption there is just one contention pattern, not two.
    < ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... to.
    Philips fusetest checks IO contention this way.

    ... . However it takes the IO contention table as a matter of ... assumption there is just one contention pattern, not two.[/QUOTE]< ... the same as the memory contention, but the uncontended cycles ...
    csmith csmith September 2007 Emulators
  • 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…

    ... understand it... the wiki assumes contention is applied before T1, but ... Chris is applying contention before T3.[/QUOTE]

    contention is applied during T1 (and IO contention at T2 ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... 're showing here are the IO CONTENTION TIMINGS!

    All ... I]incorrectly[/I]) that the IO contention is the same as memory ... floating bus, which means the IO contention is as I suggest, ... problem isn't it? IO Contention starts at 14336 and continues ...
    csmith csmith September 2007 Emulators
  • 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…

    ... tries to apply the memory contention at T1 two states later ... is that the memory contention in Harlequin does not work ... my hunch is that the IO contention gets applied in the end ... change the memory contention to be the same as the IO contention pattern?
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... later is that the memory contention in Harlequin does not work ... I was thinking about 2 contention patterns.

    [QUOTE]Chris ... my hunch is that the IO contention gets applied in the end ... be the same as the IO contention pattern?[/QUOTE]

    I ...
    csmith csmith September 2007 Emulators
  • 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…

    ...
    3. Why is the IO contention so clearly based on what ... have a pointless crossover between contention models.

    The answer ... , and the memory contention being the same as the IO - a bit ... 'd worked out for the IO contention on T2 working to push ...
    csmith csmith September 2007 Emulators
  • 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…

    ...
    I've hooked IO contention and mem contention together and run a ... /> Fusetest - all passed
    contention - lots of FF in the ... implemented the T1 only mem-contention check.

    [I ... now returns 14347. Philips contention returns all 0's[/I ...
    csmith csmith September 2007 Emulators
  • 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…

    ... ULA fetches and memory contention is concerned. And IO contention very likely as ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... /> At least I got the IO contention worked nailed, and that [I ...
    csmith csmith September 2007 Emulators
  • 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…

    ... ULA fetches and memory contention is concerned. And IO contention very likely as ... you realised about the mem contention of T1 is exactly the ... same as what happens for IO and T2 - and looking at ...
    csmith csmith September 2007 Emulators
  • 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…

    ... of interest for memory and IO contention testing. I have run it ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... what are the chances of IO contention not being applied at ... Also, the fact that all contention is supressed during TW and ... performed prove that the 48k IO contention must really work as described ... as well as suppressing the contention during the following two ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Leave AY Chip alone guysWould you have a go at a child with down syndrome? No, thought not. AY has Asberge Syndrome, it's a form of Autism - think of that please before y…

    ... old could have coded accurate IO contention using Visual C++...

    rich_chandler rich_chandler September 2007 Chit chat
  • Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…

    ... didn't apply enough contention to IO instructions, which made their ... reliably or any other IO practically impossible. Having to ... instead of the intended IO contention model by forcing the ... workaround instead of the intended IO contention model, and so the ...
    Patrik Rak Patrik Rak March 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... I (supposedly) corrected the contention handling for IO where a contended memory ... fully understood the circumstances when IO contention is applied to the 0x7ffd ...
    csmith csmith July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    I did some measurement of ULA128. It seems that there is different IO contention. There is one extra case for canceling IO contention in opposite of ULA48. It is also canceled if C3-1 is equal to 4 and MREQT23 is zero at the same time.
    vranik vranik July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... 's book about ULA the IO contention shouldn't depend on MREQ ...
    vranik vranik July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... 's book about ULA the IO contention shouldn't depend on MREQ ... results above yet, but the IO contention [I]can[/I] depend on ... of T2 and "cancels" the contention. See page 206.

    io contention won't be affected by ...
    csmith csmith July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... 't happed. I tested IO contention because A14 and A15 are ... shouldn't be a memory contention.

    I forgot to ... contended pulses are missing. The contention period start at the third ...
    vranik vranik July 2011 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... in the ULA+ to reduce IO contention, it is important that the ... chips, after startup, with zero contention - and it's a real ...
    csmith csmith March 2013 Hardware
<1234567…34>

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