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<1…13141516171819…34>
  • The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…

    ... can cause the ULA to try to apply contention when the CPU ...
    1024MAK 1024MAK November 2015 Development
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    [quote="BiNMaN;839856"]ULA+ was emulation only, now it' ... be room in the new ULA for added functions).

    ULA+ was designed from day one ... causing problems such as extra contention required to allow it to ...
    AndyC AndyC November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... you aren't replacing the ULA you need to allow it ... of doing so and the contention that will need to be ...
    AndyC AndyC November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... "ULA". So no problems with memory speed access or extra contention. The ... the conventional part of the "ULA" logic.

    [b][i ...
    1024MAK 1024MAK November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... of having to introduce contention because the ULA still needs exclusive access ...
    AndyC AndyC November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    Oh, and about contention. I understand that the USSR ... more development time and the ULA that they had available had ...
    1024MAK 1024MAK November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... ="1024MAK;839963"]Oh, and about contention. I understand that the USSR ... more development time and the ULA that they had available had ...
    chernandezba chernandezba November 2015 Emulators
  • No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…

    ... + is another clone without memory contention.

    Given the poor ... pixels by the ULA), the lack of memory contention was probably about ...
    zub zub November 2015 Development
  • No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…

    ... “ULA” which requires a 4 MHz clock, and uses the same contention ...
    zub zub November 2015 Development
  • 7mhz CPU?One of the things I like about Spectaculator, is that I can zap the clock speed of the emulated CPU up. Doing so makes me wonder about why the desig…

    ... already exists). But all the contention and DRAM timing signals would ... difficult.

    Remember the ULA does a lot of hidden ... high speed.

    The ULA chips fitted to later issue ... compatible and using the original ULA chips would have made it ...
    1024MAK 1024MAK December 2015 Hardware
  • NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…

    [quote="1024MAK;842470"]The ULA only stops the clock ... . I understand why the ULA stops the clock during pixel ... lower RAM), then the ULA doesn't halt the CPU ... I swear I have the ULA book but I guess I ... to re-read the memory contention chapter a dozen more ...
    cbmeeks cbmeeks December 2015 Games
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... ago, the relationship between the ULA and how it affects timings ... on the TV. As the ULA repeatly reads the value of ... ,(16384) ;an operation that generates contention

    ld a,81h ...
    mcleod_ideafix mcleod_ideafix December 2015 Vega
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... you're going to emulate. Contention actually slows down the emulation ... in the frame (usually at contention points) you have to update ... a couple of levels of ULA snow emulation - RealSpec makes a ...
    Dunny Dunny December 2015 Vega
  • Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…

    ... between cpu + ula and only when the ula is accessing ... know when to apply contention. However you could have ... a contention on and contention off mode to ... in the video frame the ula is.

    ... can see where the contention delays are. On the ...
    Alcoholics Anonymous Alcoholics Anonymous February 2016 Development
  • Emulator developmentHi, Could anyone explain or direct to a link that explains in not to technical terms how an emulator is developed. It has always blown my mind eve…

    ... 's an OUT to a ULA port's speaker bit.
    contention, multicolour effects etc, but they ... keyboard handling. Then add more contention, port contention, unhandled port reads, all ...
    Dunny Dunny March 2016 Emulators
  • Character Based SpritesHi, I'm working through Jonathan's excellent guide to writing games, and have mastered the animation of single UDGs. Before or move onto Pixel…

    ... ) is uncontended, since ULA doesn'recognize it as requiring contention.

    contention.
    RMartins RMartins July 2016 Development
  • Character Based SpritesHi, I'm working through Jonathan's excellent guide to writing games, and have mastered the animation of single UDGs. Before or move onto Pixel…

    ... ) is uncontended, since ULA doesn'recognize it as requiring contention.

    contention.[/quote]

    I figured ...
    Sol_HSA Sol_HSA July 2016 Development
  • Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…

    ... nothing to do with ULA contention, "snow" or the ULA being unable to ... />
    It is true that contention doesn't occur during the ...
    BloodBaz BloodBaz December 2016 Sinclair Miscellaneous
  • Screen resolutions and the Speccy's limits?What list of screen resolutions/palettes could the ZX Spectrum feasibly produce on a standard PAL TV if RAM, ULA or other space constraints is not a …

    ... Then there is the ULA+, again it offers extras ... paper colour (another ULA register like used for ... ULA no longer needed to stop the CPU clock, cutting out contention ...
    To save some ULA pins for extra colour outputs ... keyboard port from the ULA and use a ...
    1024MAK 1024MAK January 2017 Hardware
  • Screen resolutions and the Speccy's limits?What list of screen resolutions/palettes could the ZX Spectrum feasibly produce on a standard PAL TV if RAM, ULA or other space constraints is not a …

    ... Then there is the ULA+, again it offers extras ... paper colour (another ULA register like used for ... ULA no longer needed to stop the CPU clock, cutting out contention ...
    To save some ULA pins for extra colour outputs ... keyboard port from the ULA and use a ...
    Rebelstar Rebelstar January 2017 Hardware
  • Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…

    ... . But, if I implemented the ULA in a CPLD or an ... I've have a zero contention video memory. That would be ... the HDL description of the ULA out there. It would be ... I'll tackle a CPLD ULA based board. I normally have ...
    msansom msansom February 2017 Hardware
  • Spectrum 48k Clock SpeedSo I was reading the [url="http://www.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrum48K_ServiceManual.pdf"]Spectrum 48k Service Manaul[/u…

    Yeah, that's bull. The ULA gets it's 14MHz clock and then outputs a nominal 3.5MHz clock to the CPU (this won't be a true 3.5MHz though, when memory contention is taken into account).

    B
    balford balford February 2017 Hardware
  • What are the differences between the +2 and the +2A ?I only acquired a +2 for the first time in my life a few months ago. It works fine. :) I even managed to tracke down nearly all the wargames by the s…

    ... clock (crystal) for the ULA, CPU and the PAL colour ... +2 uses the same ULA as the toastrack, so ... similar, and hence the memory contention is the same.
    ... away from using a ULA and used a ASIC ... the +2 having the same ULA as the toastrack!
    ...
    1024MAK 1024MAK February 2017 Games
  • What are the differences between the +2 and the +2A ?I only acquired a +2 for the first time in my life a few months ago. It works fine. :) I even managed to tracke down nearly all the wargames by the s…

    ... switched away from using a ULA and used a ASIC instead ... the +2 having the same ULA as the toastrack!
    [/quote ... the change in the memory contention layout wasn't spotted in ...
    AndyC AndyC February 2017 Games
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... RFSH from CPU for eliminate ula effect known as "screen raining ... /O ports slow-down CPU (ula slow-down cpu with same ... with original I/O space contention:
    [url]http://velesoft.speccy ...
    Renegade Renegade April 2017 Hardware
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    The contention is not limited to ... non-contended, as the ULA has no access to it ... be accessed by either the ULA or the CPU. If ... as the ULA stops the CPU. The ULA does not ... chips, because both the ULA and the CPU share the ... talk" to one device (ULA or CPU) at a time ...
    1024MAK 1024MAK May 2017 Development
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... window every frame when the ULA's drawing the border at ... (and the sides too) where contention isn't an issue. That ...
    Mysterion Mysterion August 2017 Development
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... window every frame when the ULA's drawing the border at ... (and the sides too) where contention isn't an issue.[/quote ...
    evilpaul evilpaul August 2017 Development
<1…13141516171819…34>

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