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  • 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…

    ... implementation of AY within the FPGA or an ADC wired to ...
    XorA XorA August 2012 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…

    ... implementation of AY within the FPGA or an ADC wired to ... delta-sigma ADC in a FPGA using LVDS inputs as a ...
    JonS JonS August 2012 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…

    ... open (since to build the FPGA core, you'd need to ...
    Winston Winston August 2012 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…

    [QUOTE=XorA;649583]HDMI would mean the implementation of AY within the FPGA[/QUOTE]
    That's one of the things I'd like to include in this new ULAPlus clone, merging its output with the beeper signal.
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • A new ZX spectrum cloneOver the past 12 months i have been developing a new spectrum clone as a hobby project to waste my spare time on. It is still not fully complete yet …

    ... extended functionality plus a large FPGA (underneath the PCB) that handles ... the co-processor, however the FPGA should be able to catch ...
    mspec mspec September 2012 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…

    ... around with first in a FPGA before requesting a ZXI port ...
    JonS JonS September 2012 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…

    ... around with first in a FPGA before requesting a ZXI port ... whole speccy is in the fpga) then just use the "beta ...
    guesser guesser September 2012 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…

    ... whole speccy is in the fpga) then just use the "beta ...
    JonS JonS September 2012 Hardware
  • Games that could be better off with a 7MHz CPUI've just reviewed Kung Fu Master for the Spectrum, as I remember it as a very poor conversion from the arcade. Then it just ocurred to me to raise t…

    ... version of prism with the FPGA Z80 core supported all four ...
    JeffBraine JeffBraine September 2012 Games
  • A new ZX spectrum cloneOver the past 12 months i have been developing a new spectrum clone as a hobby project to waste my spare time on. It is still not fully complete yet …

    ... extended functionality plus a large FPGA (underneath the PCB) that handles ... the co-processor, however the FPGA should be able to catch ...
    chev chev September 2012 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…

    ... screen between pins at the FPGA :( It's nevertheless present between ...
    mcleod_ideafix mcleod_ideafix September 2012 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…

    ... a bit off side. The FPGA is just in its place ...
    mcleod_ideafix mcleod_ideafix September 2012 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…

    ... , it would only need the FPGA and the platform ROM. No ...
    mcleod_ideafix mcleod_ideafix September 2012 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…

    ... of time needed for the FPGA to be configured by the ... . Even at this frequency, the FPGA is configured and starts working ...
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…

    ... 's Spectrastick, Alessandro Dorigatti's FPGA core (versions of which exist ... -in ULAplus" J?dar's FPGA clone.

    Mostly you ...
    chev chev September 2012 Announcements
  • 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…

    ... who had more experience designing FPGA boards in our lab, ... and they told me that FPGA's (and microcontrollers by ... based upon the Spartan 1 FPGA (5V supply, 5V tolerant ... ) too far from the FPGA chip, and... no ground ... signal generated by the FPGA is adequate to be ...
    mcleod_ideafix mcleod_ideafix September 2012 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…

    ... the internal memory of the FPGA (9KB if I remember well ...
    mcleod_ideafix mcleod_ideafix September 2012 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…

    ... the internal memory of the FPGA.[/QUOTE]

    I might ... these buffers are in the FPGA - the Spartan 6 LX9 has ...
    Winston Winston September 2012 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…

    ... these buffers are in the FPGA. The shadow screen buffer is ...
    BiNMaN BiNMaN September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... this approach work on any FPGA besides Spartan 6? I mean ...
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... this approach work on any FPGA besides Spartan 6? [/quote]
    Winston Winston September 2012 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…

    ... to a +2A. With an FPGA you should go for the ...
    chev chev September 2012 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…

    ... to a +2A. With an FPGA you should go for the ...
    BiNMaN BiNMaN September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... to actually put on the FPGA, and generates a simulation from ...
    Winston Winston September 2012 Hardware
  • DivIDE CompatabilityThe Spectrum is 30 show proved a valuable event for investigating issues with Spectrums which do not work with the DivIDE.... The ones I sell are ma…

    ... it necessary to use an FPGA, and you would not really ...
    Johan1973 Johan1973 September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... which is 112MHz. The FPGA development board I have has ... used with the Spartan-6 FPGA's PLL configured as ... t want to kill the FPGA!) to do level translation ... is the bottom trace. The FPGA generated clock is the top ... (As you can see, the FPGA output is a lot less ...
    Winston Winston September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    I think you can say "test successful!". My sincere congratulations :) :)
    Does your clock recovery circuit take much space into your FPGA? Could it be implemented in a plain CPLD?
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • Average age of a Spectrum fanHi! I'm wondering what's the average age of us, readers of this forum. I'm 29 and started playing and programming on the Spectrum when I was 13 (infl…

    ... 'm ordering one of those FPGA hardware spectrum emulator boards soon ...
    jayteebee jayteebee September 2012 Games
  • Speccy 2010 / 2012Hi All, There are so many projects going on at the moment with the FPGA type spectrum I'm lost and have no idea where to look.. I like the idea of …

    ... could be added to the FPGA core, but others are too ...
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • Speccy 2010 / 2012Hi All, There are so many projects going on at the moment with the FPGA type spectrum I'm lost and have no idea where to look.. I like the idea of …

    ... was built mainly as Pentagon FPGA clone, it supports many file ... it, it is just nice FPGA show.
    kpuchatek kpuchatek September 2012 Hardware
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