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Search Again :: Adv Search 1000 results in 0.013s
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  • Growing up... Jasmin supports 128/+2 nowHi, all. New version of Jasmin is available (v0.11). It supports ZX Spectrum 128 and ZX Spectrum +2 models. Try it [URL="http://www.dustedpixels.co…

    ... information on what is memory and I/O contention in "physical" ... unlikely to me, since contention only take place when reading ... when writing to non-contended memory areas.

    ... start to design and implement contention emulation.

    Regards ...
    micapolos micapolos May 2007 Emulators
  • Growing up... Jasmin supports 128/+2 nowHi, all. New version of Jasmin is available (v0.11). It supports ZX Spectrum 128 and ZX Spectrum +2 models. Try it [URL="http://www.dustedpixels.co…

    ... why you get contention only for contended memory, and why you ... can get things like IR contention ... and I/O port contention, neither of which are accesses to memory ... with our best knowledge of contention: if you want the ...
    Philip Kendall Philip Kendall May 2007 Emulators
  • Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…

    ... (each ULA type has different contention points, correct?) Can you explain ... model only gets one contended memory fetch during each eight ... So, when running in contended memory, the 48K/128K ULAs still ... see a contended memory address sitting on the ...
    Woody Woody May 2007 Development
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... to run to clear the memory down (just in case I ... /-5v supplies to the 4116 memory, and check the +5v supply ... contended memory (since the ULA will stop the CPU clock when contention ... ULA from accessing the screen memory.
    Winston Winston May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... /-5v supplies to the 4116 memory, and check the +5v supply ... contended memory (since the ULA will stop the CPU clock when contention ... ULA from accessing the screen memory.[/QUOTE]

    Unfortunately that ...
    Avian Avian May 2007 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…

    [QUOTE=karingal;193731]Is contention necessary for the border routines ... border or writes to screen memory. But that's just me ...
    Dunny Dunny June 2007 Emulators
  • "Add Watch" Debug for EmulatorsHi, I am working on completing a JSW-style game that I started in 1991. Although programming using TASM and Spectaculator is far easier than on th…

    ... time to look into adding contention to the code, so we ... about the emulation of contended memory. Nice one mate.
    BloodBaz BloodBaz June 2007 Emulators
  • Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…

    ... controls the lower RAM (including contention by withdrawing the CPU clock ... (and instead, select your external memory on /CAS). The /RAS signal ... for each row). The 4116 memory only reads or writes when ... need to still comply with memory timings for when /CAS goes ...
    Winston Winston June 2007 Hardware
  • 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…

    ... there's no real contended memory information in there...[/QUOTE]
    contention, it might have happened that ...
    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…

    I'm obviously missing something here, as I don't see how ulatest3, which runs in uncontended memory and an uses an uncontended port, can be used to test anything to do with contention.
    Philip Kendall Philip Kendall 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…

    ... ulatest3, which runs in uncontended memory and an uses an uncontended ... test anything to do with contention.[/QUOTE]

    Two discussions ... an IO instruction that experience contention, and when that is.
    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…

    ... B]not[/B] applying the contention. This results in the IR ... FAQ and Wiki assume the contention happens at T1, while ... T1 itself, or does the contention really take place at beginning ... normal opcode fetches and memory access (saying the contention happens at point ...
    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…

    ... reads the second attribute from memory, is [B]not[/B] contended ... is just one type of contention, which starts at 14336.
    Woody Woody 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…

    ... see why the T3 of memory read/write is not contended ... the ULA starts applying the contention only when ~MREQ is still ...
    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…

    ... see why the T3 of memory read/write is not ... :
    [I]"I think contention occurs whenever the address bus ... = 0x4000 - 0x7fff AND MREQ high contention selection?

    It seems ... +3 ULA, which applies less contention than the 48K ULA (specifically ...
    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…

    ... 0x4000 - 0x7fff AND MREQ high contention selection?[/QUOTE]

    ... ULA, which applies less contention than the 48K ULA ( ... ULA applies contention when there is no memory access going ... on (check the Wiki for example for contention ...
    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…

    ... 48k ULA applies contention when there is no memory access going on ... (check the Wiki for example for contention ...
    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 ... 2/3 - shows 7 contended memory cycles.

    No ... implemented the T1 only mem-contention check.

    [I] ... Floatspy 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…

    ... that only T1 of a memory access is contended is it ... 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…

    ... you'd just finished your contention implementation based on the old ... which T-states of the memory read/write are contended. Could ...
    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…

    ... are of interest for memory and IO contention testing. I have run ...
    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…

    ... 228 instead of 224, the memory in range #4000-#7FFF is ... to mean that some different contention scheme was applied to the ... paging doesn't disable the contention of the high range, port ...
    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…

    ... which T-states of the memory read/write are contended. Could ... code fetch), M2 (memory read) and M3 (memory write) cycles is contended ... to the address of the memory accessed in case of M2 ... extra inserted T states the contention happens according to the value ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... due to +3's ULA contention. Don't know...
    [/QUOTE ... DEMO LEVEL3 to 3T read memory and 1T write to border ...
    velesoft velesoft October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... ;221119]The +3 has no contention outside of paper areas. It ... with 16x8 cycle sequences of contention, but with 7 cycles out ... to transfer data to contended memory with 2T read/write DMA ...
    omega omega October 2007 Hardware
  • SAM gets ethernetWhilst off topic - head over to [url]www.samcoupe.com[/url]. Colins got his ethernet board for the SAM available to buy and some interesting news ab…

    ... chip, which is a memory mapped ethernet controller with TCP ... . Aside from the register memory, it has 32 kbyte ... likely to be a bit memory hungry), plus a CPLD ... plan is to make this memory mappable in 8K pages, ... things like RST#8 trap contention can't be sorted ...
    Winston Winston October 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... memory... failed (0x01)
    High port contention 1... passed
    High port contention ... it hangs on 'High port contention 2' but is otherwise the ... . In 48K mode 'High port contention 2' passes (and is otherwise ...
    gasman gasman November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... )
    Contended memory: failed (0x02)
    High port contention: passed
    High ... port contention 2: failed (0x02 ...
    Jon Needle Jon Needle November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... memory... failed (0x01)
    High port contention 1... passed
    High port contention ... memory... failed (0x02)
    High port contention 1... passed
    High port contention ...
    Mr. Anonymous Mr. Anonymous November 2007 Hardware
  • Quick testCould I ask anyone with a real 128K or +2 to run the latest [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]Fuse test suite[/url] on it and …

    ... ... passed
    Contended memory... passed
    High port contention 1... passed
    High port contention 2... passed
    gasman gasman November 2007 Hardware
<1…14151617181920…34>

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