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<1234567…34>
  • 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 ... Spectrum clones using: this core, a Z80 Verilog core, and some other ... input because it isolates the FPGA pins from dangerous levels that ... way I hope to tune ULA timmings in case there's ...
    mcleod_ideafix mcleod_ideafix April 2012 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.org ... first suggested.

    The FPGA used is a Spartan 6 ...
    mcleod_ideafix mcleod_ideafix July 2013 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…

    ... well, that uses the new ULA core, and a 56MHz sigma-delta ... signals are generated inside the FPGA with no need to built ...
    mcleod_ideafix mcleod_ideafix May 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…

    ... well, that uses the new ULA core, and a 56MHz sigma-delta ... signals are generated inside the FPGA with no need to built ...
    chev chev May 2012 Hardware
  • How much would you pay for this FPGA clone?...given that a mint 128 goes for around ?125. [img]https://dl.dropboxusercontent.com/u/15659782/chloe280seboxed.jpg[/img] Features: [list] [*]100%…

    ... /> Yes. It requires a different FPGA core.

    [quote]fixing the ... the states[/quote]
    The ULA core is certainly capable of outputting ... the Z80 is on the FPGA it should be trivial to ... someone has finally done an FPGA version. But waiting this long ...
    chev chev May 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... ULAplus should work fine on ULA-based 128s. [/QUOTE]

    FPGA dev board that connects to ... back now to keep the ULA+ core synchronized with where the electron ...
    Winston Winston May 2014 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... back now to keep the ULA+ core synchronized with where the electron ... you at with your FPGA dev board? What FPGA are you planning ... did consider moving to a FPGA which would have advantages other ... the Altera Cyclone series of FPGA's and the configuration devices ...
    Basher Basher May 2014 Hardware
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... a natural extension to the ULA that can be done without ... too much hassle. The original ULA fetches two bytes per memory ... . All that without changing the ULA core much at all and without ... the video from the existing ULA would come up with these ...
    Alcoholics Anonymous Alcoholics Anonymous November 2005 Hardware
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... natural extension to the ULA that can be done ... much hassle. The original ULA fetches two bytes per memory ... that without changing the ULA core much at all and without ... video from the existing ULA would come up with ... easy extension to the ULA to provide the hi ...
    monty.mole monty.mole November 2005 Hardware
  • ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …

    ... />
    I will upload my ULA core when I get a chance ...
    csmith csmith September 2011 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…

    ... , using a CPLD for a ULA replacement, with modern SRAM and ... contention.

    Hopefully this ULA core will kickstart other projects!
    JonS JonS May 2012 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…

    ... (e.g. a ferranti ULA) is an ASIC just as ... much like the modern day FPGA.

    It ... implemented on a Ferranti ULA because of gate density ... GAL, PLA, PAL, ULA, SCLD, FPGA, etc are about gate density ... s still different from a ULA because, although you are ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Sinclair Miscellaneous
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    about ULA, iirc, someone said original 'blueprints' were lost?
    if they made a 'full' copy of ULA in FPGA, is there no way that with software and some precise clock measurement or something, one can tell difference? some sort of 'FPGA Turing test'.
    orange orange November 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... suddenly 'become' the Spectrum ULA. An FPGA doesn't spontaneously lose some ... of misdirection. A properly configured FPGA may be doing the same ... almost identical way, to a ULA. But a Spectrum-on-a ... 're then using the FPGA to replicate ULA, CPU, ROM, RAM and ...
    joefish joefish November 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... suddenly 'become' the Spectrum ULA. An FPGA doesn't spontaneously lose ... misdirection. A properly configured FPGA may be doing the same ... 're then using the FPGA to replicate ULA, CPU, ROM, RAM ... wires between parts on the FPGA chip. The 'programming' being ...
    Alcoholics Anonymous Alcoholics Anonymous November 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... suddenly 'become' the Spectrum ULA. An FPGA doesn't spontaneously lose some ... 're then using the FPGA to replicate ULA, CPU, ROM, RAM ...
    When configuring CPLD or FPGA devices, for simple designs you ... saying that a FPGA design that includes ULA and CPU is ...
    1024MAK 1024MAK November 2014 Hardware
  • SpecNextThis looks interesting... http://www.specnext.com/

    ... I change something in the ULA core :D
    mcleod_ideafix mcleod_ideafix May 2016 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
  • 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…

    ... added to the V6Z80p Spectrum core.
    Most of them ... ports.
    Some examples: ULA+, Timex modes, Kempston Joystick, etc ... will be completed, then the core will switch to the "standard ... also for
    other hardware/FPGA core developers!

    If ...
    adorigatti adorigatti January 2013 Hardware
  • MiST fpga and ZX Spectrum coreI don't see any MiST related thread here. You've probably already heard of it, it's a device which recreate some computers (atari st, amiga, amst…

    ... the sinclair spectrum) with a FPGA (like the Vega, Speccy2010, ZX ... is a new ZX Spectrum core which is now much more ...
    farvardin farvardin December 2015 Hardware
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... offer help in using an FPGA to be a video display ... the eZ80, the entire core of the FPGA can be devoted to ...
    Sparky Sparky September 2004 Sinclair Miscellaneous
  • 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
  • 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 …

    ... implemented on an Altera FPGA). This PC was ...
    Moving onto some FPGA stuff, here's a Jupiter ... implemented on an inexpensive FPGA board (US$47 delivered ... an open source Z80 core. I was given a ... ideas of an external FPGA-based ULA+ implementation) it was ...
    Winston Winston April 2011 Sinclair Miscellaneous
  • ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …

    ... of the project.

    FPGA core features:

    - Cycle ... in "The ZX Spectrum ULA: how to design a ... 7MHz, 14MHz (experimental). The original ULA contention algorithm is always applied ... NTSC ULA)

    At today, to boot the core some ...
    adorigatti adorigatti August 2011 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…

    ... -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
  • ULAPlus: showing different screen modes in one screenI wanted to write a demo showing the same screen, converted to various screen modes available on the Spectrum (well, a Spectrum clone capable of show…

    ... showing Timex hicolour mode and ULA+ mode).

    Currently, ... emulator (LCD screen) and the FPGA clone (CRT monitor)
    [img ... a Timex HiColour screen with ULA+ palette enabled.

    ... picture) due to the T80 core not generating a valid IORQ ...
    mcleod_ideafix mcleod_ideafix May 2012 Development
  • 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…

    ... flash chip to store FPGA configuration. An optional AD724 ... pins of the ULA socket to FPGA interface need to ... /> Quoting from Digikey:
    FPGA: 9.53 EUR (VQ100, smaller ... an AY-3-8912 core, or PS/2 keyboard ... real components (namely the FPGA and the platform ROM ...
    mcleod_ideafix mcleod_ideafix August 2012 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
  • Mist Fpga with as spectrum corei've just got hold of one of the mist boards and am running the screen core. still trying to get esxdos to run but can load tap and discs through th…

    i've just got hold of one of the mist boards and am running the screen core.
    still trying to get esxdos to run but can load tap and discs through the menus
    the hard part was getting a monitor that was comparable but that's also sorted now
    caver99 caver99 January 2017 Hardware
  • ZX Spectrum Next Core Released under GPL 3 LicenseAs promised by the original Kickstarter, the Next's FPGA sources are now public and licensed under GPL v.3.0. Core authors: Read the embedded documen…

    ... original Kickstarter, the Next's FPGA sources are now public and ... under GPL v.3.0. Core authors: Read the embedded documentation ...
    colonel32 colonel32 February 2020 Announcements
<1234567…34>

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