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<1234567…34>
  • I've had better nights...So I got a broken issue 2 today, case in good nick but the diags board showing multiple failures in both lower/upper RAM. Never mind, good as a spare…

    I don't think Chris has made a 'production' board for the ULA replacement. The closest thing to an actual production ready one is the ULA+ from mcleod_ideafix, but he's working on his doctorate at the moment so it may be some time yet...
    Winston Winston November 2013 Hardware
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... If you work at the ULA/FPGA/CPLD/whatever level, you can ... as a GAL, CPLD, or FPGA.
    [/quote]

    FPGA :) The difference is only ... can be said of an FPGA, especially the OTP ones ... end up with an FPGA that cannot be reprogrammed.< ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Sinclair Miscellaneous
  • PoC for a ULA video generator described using Handel-C and a Basys FPGA board.Recently, I've taken a course about hardware design for video processing using FPGA's. The HDL used in the course was Handel-C, a C look alike langua…

    ... video processing using FPGA's. The HDL ... , an academic level FPGA board, quite cheap. ... description of the ULA behaviour when generating ... FPGA is rated at 25MHz instead of 14MHz of the original ULA ... FPGA runs several FSM in parallel: one of them is the ULA ...
    mcleod_ideafix mcleod_ideafix November 2010 Hardware
  • 2 new FPGA based clone from russiaFirst of all I wanna introduce you to the [B]ZX Evo[/B] by NedoPC -> [URL="http://www.nedopc.com/zxevo/zxevo.php"]http://www.nedopc.com/zxevo/zxevo.p…

    ... , Covox) with an FPGA instead of an ULA, so you can make ... and AY being in the FPGA as well, "only" 2MB ... use Z80-Cores on the FPGA, which can be clocked at ... the limit of the FPGA, which is 60Mhz virtually breaking ... long as you program the FPGA appropriately.
    Shockwav3 Shockwav3 August 2009 Hardware
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... ) forum regarding... a dead ULA, but only a partially dead ... />
    (Original here, by mcleod_ideafix: [url]http://www.zonadepruebas.com ... life.

    "Another ULA knackered!" I thought...but... how ... to read something from the ULA. This combination (the ...
    Winston Winston October 2010 Hardware
  • Brief report about RetroEncounterAnother April... another retro event! (Firstly sorry for the quality of the photos, owing to not being able to find my camera battery before leaving …

    ... />
    (that's Mcleod_ideafix's hands you see playing ... were brought along by mcleod_ideafix (he implemented the Jupiter ... ideas of an external FPGA-based ULA+ implementation) it was ... br /> Other stuff:

    mcleod_ideafix shot a short video of ...
    Winston Winston April 2011 Sinclair Miscellaneous
  • Experiments mixing ULA+ and Timex Hicolour featuresI'm trying to improve my Verilog skills, so I've written a description of a complete ZX Spectrum 128K (+2 grey ROMs), with AY-3-8912. I wanted to add…

    ... -8912. I wanted to add ULA+ support, and in the way ... Starter Board, with a XC3S1000 FPGA. No double port RAM has ... been used to implement the ULA+ palette registers.

    I ... to add this to the ULA+ page, if you wish ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…

    ... , hopefully, complete description of the ULA chip, written in Verilog, and ... input because it isolates the FPGA pins from dangerous levels that ... on it to act as ULA, with a true Z80 and ... way I hope to tune ULA timmings in case there's ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • Configuration of FPGA coresHi all! Lately a lot of features have been added to the V6Z80p Spectrum core. Most of them are handled (clearly) using ports. Some examples: ULA+, Ti…

    ... ) using ports.
    Some examples: ULA+, Timex modes, Kempston Joystick, etc ... also for
    other hardware/FPGA core developers!

    If ...
    adorigatti adorigatti January 2013 Hardware
  • ULA Plus demonstration!I have seen with my own eyes the ULA+ in action - the actual real hardware. Fortunately, so did the camera in my phone. Here's a short (shaky) video …

    ... with my own eyes the ULA+ in action - the actual real ... ) video of the ULA+ being demonstrated by mcleod_ideafix at RetroMadrid last weekend ...
    Winston Winston March 2013 Hardware
  • Spectrum FPGA clone with HDMI video output by Jozsef LaszloThis clone is based upon the ULA core I wrote for opencores.org . It features a scandoubler and HDMI conversion engine. Jozsef has found that a 28MHz…

    ... clone is based upon the ULA core I wrote for opencores ... first suggested.

    The FPGA used is a Spartan 6 ...
    mcleod_ideafix mcleod_ideafix July 2013 Hardware
  • ULA Replacement??I searched, but maybe I just missed it. Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhap…

    I searched, but maybe I just missed it.

    Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhaps something else such as a microcontroller?

    Thanks
    cbmeeks cbmeeks October 2015 Hardware
  • Experiments mixing ULA+ and Timex Hicolour featuresI'm trying to improve my Verilog skills, so I've written a description of a complete ZX Spectrum 128K (+2 grey ROMs), with AY-3-8912. I wanted to add…

    [QUOTE=mcleod_ideafix;615637]I'm trying to ... -8912. I wanted to add ULA+ support, and in the way ... Starter Board, with a XC3S1000 FPGA. No double port RAM has ... been used to implement the ULA+ palette registers.
    [/QUOTE]
    JeffB JeffB April 2012 Hardware
  • ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…

    [QUOTE=mcleod_ideafix;623836][B]ULAplus with Timex ... well, that uses the new ULA core, and a 56MHz sigma ... signals are generated inside the FPGA with no need to built ...
    chev chev May 2012 Hardware
  • Synth SpeechHi All, Can anyone recommend an easy way to get a *subroutine that I can call in asm that will give a decent sounding phrase? I've had a look at a …

    [QUOTE=Shiru;641913]mcleod_ideafix suggests advanced methods that use ... output analog signals from a FPGA. I used them in my ... to generate both sound output (ULA + AY) and video output (3 ...
    mcleod_ideafix mcleod_ideafix July 2012 Development
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    [QUOTE=mcleod_ideafix;646775]I'm sure ... bus lines of this ULA might not have enough ... The soft-core inside this ULA is based in the same ... Clock Management) inside the FPGA, which in turn generates all ... enhance the capabilites of this "ULA". For example, an AY ...
    ANDREW RYALS ANDREW RYALS August 2012 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... .

    [QUOTE=mcleod_ideafix;646700]- It main purpose is ... interface.

    [QUOTE=mcleod_ideafix;646700]- Its main advantage is ... .

    [QUOTE=mcleod_ideafix;646700]- It is not compatible ... FPGA, so the soft-core could be adapted for ULA ...
    Fruitcake Fruitcake August 2012 Sinclair Miscellaneous
  • 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=mcleod_ideafix;648833]Well... I didn't buy 20 FPGA's to build ... 20 "ULA's" for myself ...
    Johan1973 Johan1973 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=mcleod_ideafix;653374] A double buffer for ... the internal memory of the FPGA.[/QUOTE]

    I ... being a DVI-D/HDMI ULA+ that can be plugged into ... in time with where the ULA thinks that the TV scan ... these buffers are in the FPGA - the Spartan 6 LX9 ...
    Winston Winston September 2012 Hardware
  • Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…

    ... be all that difficult - mcleod_ideafix's ULA+ implementation just uses resistors to ... the clamping diodes of the FPGA he's using). The ... signals). Unlike a CPLD, the FPGA will lose its configuration when ... . The resources for an FPGA are quoted usually as CLBs ...
    Winston Winston January 2013 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=mcleod_ideafix;686350]
    While the ULA is waiting for the time ... edge of RAS, the ULA reads again its address lines ... br />
    [QUOTE=mcleod_ideafix;686350]
    All ULA I/O ports must ... in a modern CPLD or FPGA with plenty of gates? Although ...
    Mr X Mr X March 2013 Hardware
  • @zxuno, the TwitterHi! Now we have a Twitter account about ZX-Uno FPGA Spectrum board project. Follow at: [url]https://twitter.com/zxuno[/url] Main site: [url]http:/…

    ... -phenomenon'..[/QUOTE]

    The ULA+ has been real hardware for ... - Miguel Angel (mcleod_ideafix) who also did most the FPGA work on the ... a hardware implementation of the ULA+ that fits inside a 48K ... Spectrum (in the ULA socket). He brought it to ...
    Winston Winston March 2014 Announcements
  • @zxuno, the TwitterHi! Now we have a Twitter account about ZX-Uno FPGA Spectrum board project. Follow at: [url]https://twitter.com/zxuno[/url] Main site: [url]http:/…

    [QUOTE=Winston;757158]The ULA+ has been real hardware for ... - Miguel Angel (mcleod_ideafix) who also did most the FPGA work on the ... a hardware implementation of the ULA+ that fits inside a 48K ... Spectrum (in the ULA socket). He brought it to ...
    Hark0 Hark0 March 2014 Announcements
  • We could design the LokiWouldn't it be great... if this community would develop what Sinclair himself started but was never finished: a successor of the 128K with 'cartoon l…

    ... with a Spartan-6 family FPGA which directly supports HDMI/DVI ... clone that outputs HDMI using mcleod_ideafix's ULA Plus core, the TV80 ... if you're using an FPGA which supports the signalling standard ... socket) are required since the FPGA can drive it directly.
    Winston Winston March 2014 Hardware
  • Crowdfunding ULAs?Hi everybody, I've found someone who's willing and able to make another production run of the Plessey ULA6C001E-7. We're not talking small amounts …

    ... original). mcleod_ideafix has already shown a ULA (including ULA+) ... which plugs into the ULA socket implemented on a Spartan 3 FPGA ... . Chris Smith has demonstrated a standard and timing perfect ULA ... under a grand. mcleod_ideafix is currently working ...
    Winston Winston July 2014 Hardware
  • Crowdfunding ULAs?Hi everybody, I've found someone who's willing and able to make another production run of the Plessey ULA6C001E-7. We're not talking small amounts …

    ... processes used for the original ULA any more, in other words ... an ASIC version of the ULA may actually run into millions ... - be MUCH better off asking mcleod_ideafix for the PCB design files ... working. The verilog for the FPGA is freely available on OpenCores ...
    Winston Winston July 2014 Hardware
  • Ben Heck modifies a Zee X Spectrum.Gahh, one of the differences between Americans and Europeans right there in the title. Anyway, we know better ;) ...and this isn't about that anyway.…

    [QUOTE=mcleod_ideafix;787016]
    He didn' ... ).[/QUOTE]

    [QUOTE=mcleod_ideafix;787016]Ben re-arranged the ... that it's the ULA that makes it a ... or FPGA based clones the specific behaviour of the ULA)
    ULA I don't really ...
    guesser guesser August 2014 Hardware
  • WANTED: 128k+ or 128k +2(early grey mod.) ULA chipHello, Attempting to repair my 128k+ speccy. Needs a ULA(IC1)chip from either a 128k+ or an early +2 will work also. If anyone has this chip or has a…

    ... 128k+ speccy.
    Needs a ULA(IC1)chip from either a ... 's broken(other than the ULA), please give me a shout ...
    thomas3120 thomas3120 January 2003 Wanted
  • Looking for Microdrive to test FPGA ZX SpectrumSomeone has a microdrive and some cartridges left for testing my Altera FPGA design at: [url="http://www.fpga.ch/retro_zx.php"]http://www.fpga.ch/re…

    ... left for testing my Altera FPGA design at:

    [url ... ="http://www.fpga.ch/retro_zx.php"]http://www ... .fpga.ch/retro_zx.php[/url]
    < ...
    klingler klingler July 2004 Wanted
  • ZX Spectrum 48k in FPGAFinished test design of ZX Spectrum 48k in Altera FPGA... There is already one project called "zxgate" but mine implementation uses normal VGA monit…

    ... ZX Spectrum 48k in Altera FPGA...

    There is already ... />
    See: [url="http://www.fpga.ch/retro_zx.php"]http://www ... .fpga.ch/retro_zx.php[/url]
    < ...
    klingler klingler July 2004 Announcements
<1234567…34>

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