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  • Pera Putnik's RGB interfaceI am sure some (if not many) of you will have seen Pera Putnik's RGB interface [URL="http://members.tripod.com/%7Epiters/uvyrgb.htm"]circuit diagram…

    ... will get 50Hz from the ULA.
    Living in NTSC country ... to 60Hz will change the timing of presentation and you see ...
    ingo ingo May 2009 Hardware
  • The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…

    ... information, the game has 4 timing profiles:

    1. 48K ... each line, allowing for some contention. The Pentagon version takes exactly ... T-states per line, without contention.

    I'm not ...
    joefish joefish August 2009 Development
  • The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…

    ... . If memory contention is disabled, it'll do its timing checks against ... a Pentagon, and set the timing up for that. It'll ... in the Pentagon top-border timing delay. It looks like it ...
    joefish joefish August 2009 Development
  • The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…

    ... mode, with the contention turned on. With the contention turned off, the ... 've adjusted the +2A/+3 timing so it has its own ...
    joefish joefish 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…

    ... the movement of the emulated ULA speaker output isn't just ... case caused by the actual timing hardware.

    I can ...
    Winston Winston 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…

    ... the movement of the emulated ULA speaker output isn't just ... ]

    In fact Fuse timing is based in terms of ... case caused by the actual timing hardware.

    I can ...
    Fred Fred 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…

    ... some basic scroll registers to ULA when 128k machines came out ... a lot more predictable) memory contention.
    AndyC AndyC 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 ... to VRAM from CPU and ULA (a Texas Instruments gate array ...
    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 …

    I'd speculate that the ULA in that machine is possibly ... CPU accesses it via the ULA, not directly) and it has ... the BBC Micro worked without contention was interesting. The 6502, if ...
    Winston Winston October 2009 Hardware
  • Test ROM Cartridge For SaleI'm selling another load of gear including a Sinclair Research Test ROM Cartridge. [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=4000772…

    ... is not flashing then the ULA is almost certainly at fault ... . It could also indicate a timing failure when the computer is ...
    murtceps murtceps October 2009 Sales
  • 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
  • An idea for a possible(?) new interfaceDue to the Spectrum's processor speed and the way the ULA works, there are a couple things (among others) that are difficult to do: -Gigascreen or a…

    ... speed and the way the ULA works, there are a couple ... and demos that require specific timing. It would be used only ...
    Hood Hood October 2009 Hardware
  • An idea for a possible(?) new interfaceDue to the Spectrum's processor speed and the way the ULA works, there are a couple things (among others) that are difficult to do: -Gigascreen or a…

    ... do anything else, due to timing constraints), have a simple buffered ... K of RAM and a ULA, which is all you'd ...
    Winston Winston October 2009 Hardware
  • ZXDS 0.9.0 beta 1Hi! New version of [URL="http://zxds.raxoft.cz"]ZXDS[/URL] is available. Only one important change this time, but the one I have been dreaming about…

    [QUOTE=gasman;397724](re: new ULA feature)
    I assume he ... this entirely (i.e., proper timing stuff included) would likely require ...
    Patrik Rak Patrik Rak November 2009 Emulators
  • 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…

    ... /o. In the spectruim the ULA's display file can be ... memory mapped display device. THe ULA actually owns the 16k RAM ... 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.

    ... full decoding. In the replacement ULA only partial, because otherwise you ... address lines do reach the ULA even if some of them ... values of A0-A13). The ULA after all controls these multiplexors ... it'll need a contention cycle if the ULA is busy reading ...
    Winston Winston November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... t actually arrive at the ULA, it only arrives combined with ... that arrive directly at the ULA).[/QUOTE]

    Oh. ... lines are available at the ULA. However, /IOREQ issue has ... future enhancements may change the timing of things - software that ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... s just another ULA port, with the same contention as the ... existing ULA port. Touching the ... is significantly easier to handle contention etc (of which there ... 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 ... at how many registers the ULA+ was going to need and ...
    Winston Winston November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... at how many registers the ULA+ was going to need and ... all the other video related timing. Some off-chip memory is ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... writing software for the super ULA before the hardware actually exists ... /> 4) is timing for muliticolors same like on old ULA (medium priority ...
    Fikee Fikee November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... ]4) is timing for muliticolors same like on old ULA (medium priority ... low priority)[/quote]

    Timing is uncertain until the hardware ...
    chev chev November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... normal 64-colour program. The ULA replacement will not require any ... yet is exactly how the timing and border will function. That ...
    chev chev November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... implementing a second contention model for the new ula io ports. Not ...
    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 design ...
    csmith csmith November 2009 Emulators
  • which one bit of hardware would people want re-made?I'm just curious in the sense of I see interface 1's go for a fair bit on ebay and also multiface units etc.. so whats the one thing that you don't …

    ... owing to I/O and timing differences between the machines. Sinclair ... I/O space for the ULA, Timex machines don't. Also ...
    chev chev November 2009 Hardware
  • which one bit of hardware would people want re-made?I'm just curious in the sense of I see interface 1's go for a fair bit on ebay and also multiface units etc.. so whats the one thing that you don't …

    ... owing to I/O and timing differences between the machines. Sinclair ... I/O space for the ULA, Timex machines don't. Also ...
    Mister Beep Mister Beep November 2009 Hardware
  • just thinking about ...compo for zx 16k ? anyone ?

    You could call it the Contention Competition, since all the lower ... no bigger than the original ULA. [Edit] Multi-loads are definitely ...
    chev chev November 2009 Development
  • just thinking about ...compo for zx 16k ? anyone ?

    ... ]You could call it the Contention Competition, since all the lower ... no bigger than the original ULA. [Edit] Multi-loads are definitely ...
    Fikee Fikee November 2009 Development
  • Need help with interrupts againI'm fighting to understand how interrupts code handling works I'm trying to set my simple own interrupt routine, as I don't want to be dependent on …

    ... which can fool the ula into thinking bus contention occurs. At least ... that was the explanation of ula snow ...
    Alcoholics Anonymous Alcoholics Anonymous November 2009 Development
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