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<1234567…34>
  • Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…

    ... building a shadow RAM ( 16K dual-ported memory ) that maps over the ...
    cj7hawk cj7hawk December 2020 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…

    ... no longer able to locate dual ported RAM anywhere, so bus arbitration ...
    Sparky Sparky September 2004 Sinclair Miscellaneous
  • 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…

    ... no longer able to locate dual ported RAM anywhere, so bus arbitration ... ://www.digikey.com[/url] Have Dual port RAMs from Cypress - [url ...
    pern pern September 2004 Sinclair Miscellaneous
  • External Speccy CommunicationHow does a speccy communicate with the outside world ?? Do you have to have the interface 1 for serial communications ( rs232 ) or are there other p…

    ... for microcontrollers - has an 8K dual ported SRAM buffer, checksum calculation in ...
    Winston Winston March 2007 Hardware
  • Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?

    ... to implement 'poor man's dual ported memory' which isn't too ...
    Winston Winston April 2007 Development
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... had assumed that it uses dual-ported video memory ? in which case ...
    zub zub November 2007 Emulators
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... had assumed that it uses dual-ported video memory.[/QUOTE]

    Patrik Rak Patrik Rak November 2007 Emulators
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... 7ns CPLDs that could simulate dual ported memory and not only map ...
    Winston Winston January 2008 Games
  • differences between FPGA and CPLD?As the title says... Is there a difference between these two things?

    ... , FPGAs often contain some internal dual ported RAM, multiplier units, clock management ...
    Winston Winston August 2010 Chit chat
  • RGB to VGA convertor for ZX128/+2/+2A/+3David Luftner release source code (VHDL) of SCANDOUBLER for ZX128/ZX128+2/+2A/+3: [url]http://velesoft.speccy.cz/other/scandoubler-for-zx128_fixed_by…

    ... to be mirrored into the dual port RAM. Well, you need ... read video and attribute memory (dual ported RAM inside the FPGA), and ... the screen preloaded into the dual port RAM:

    [IMG ...
    mcleod_ideafix mcleod_ideafix January 2011 Hardware
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    ... memory arbitration (or really expensive dual-ported memory) and that was really ...
    AndyC AndyC February 2012 Sinclair Miscellaneous
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... see:

    1. using dual-ported RAM
    2. handling it ...
    Winston Winston October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... see:

    1. using dual-ported RAM
    2. handling it ...
    Black_Cat Black_Cat October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... , and FPGAs tend to have dual ported memory so the problem kind ...
    Winston Winston October 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…

    ... usually some amount of fast dual-ported RAM, and also the CLB ...
    Winston Winston January 2013 Hardware
  • Linking spectrums - parralel processing is it possible?Was there any way to do this, (excluding disk, tape and microdrives)?

    ... /> Even better, one could use dual-ported ram with some logic to ...
    pmsr pmsr September 2013 Hardware
  • Linking spectrums - parralel processing is it possible?Was there any way to do this, (excluding disk, tape and microdrives)?

    ... ]Even better, one could use dual-ported ram with some logic to ...
    Knik Knik September 2013 Hardware
  • Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…

    ... device, and it's also dual ported).

    The bootstrap code ...
    Winston Winston November 2014 Hardware
  • ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …

    ... EEprom. The reason is simple - dual ported RAM is very expensive. Min ... PC and write it into dual ported RAM.

    And then ...
    tstih tstih June 2017 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... />
    Looks like it used dual-ported RAM as well, which simplifies ... a blitter chip, though with Dual Ported ram, that could work during ...
    cj7hawk cj7hawk August 2021 Hardware
  • specie external keyboard - revision one -[img]https://photos.app.goo.gl/pqeYpXnLqTwYkLvKA[/img] revision one of my external keyboard ... wow it actually worked after a little bit of crash…

    ... /> Or, better still, use a dual-ported RAM ( a small one will ...
    cj7hawk cj7hawk August 2021 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... used for program ram also ) Dual Ported.
    Mapping? Unknown, but Spectrum ... another Z80 slaved as the dual-ported RAM could have allowed some ...
    cj7hawk cj7hawk August 2021 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... used for program ram also ) Dual Ported - This would be very expensive ...
    1024MAK 1024MAK August 2021 Hardware
  • Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…

    ... used for program ram also ) Dual Ported - This would be very expensive ... video ram and building a dual-port controller with conventional 64x4 ...
    cj7hawk cj7hawk August 2021 Hardware
  • More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…

    ... he might have just used dual-ported memory.

    What would ...
    cj7hawk cj7hawk October 2021 Hardware
  • Is it possible to use two spectrums linked with one acting like a co-processor?Just wondering. Would be kind of interesting, but I guess two interface ones would be needed, or was there other ways to connect. What about ear t…

    ... I'd probably use some dual-ported RAM or four 4-bit ...
    i love the z80s i love the z80s September 2022 Hardware
  • New GP32 coming out....The spec looks excellent and should run MAME, SNES and hopefully GBA full speed. Whats also exciting is the TV out connection !.... The ultimate ho…

    ... />
    2 x 200mhz CPU (dual set up, 400mhz potential)
    ported. Rockstar devteam assembled from PSP ...
    psj3809 psj3809 September 2005 Sinclair Miscellaneous
  • running Spin with dual monitorsI use dual monitors and find that when Spin is displayed on my second monitor the border icons (minimize, maximize and close) don't work. I have to d…

    I use dual monitors and find that when ...
    Mr Millside Mr Millside May 2006 Emulators
  • A little help with info on Dual Core processors...Tomorrow I will be getting an Intel Dual Core processor. i'm new to these things and have a few very vague questions to ask. 1) Can single core co…

    ... will be getting an Intel Dual Core processor. i'm new ... core support.

    2) Dual core processors seem to have ...
    HonoredShadow HonoredShadow November 2007 Chit chat
  • Dual Screen Computer SetupAfter getting my laptop I have been using it in dual screen mode with my existing monitor. It has increased my productivity to quite an extent. I ho…

    ... have been using it in dual screen mode with my existing ... .

    I know about dual head cards but am to ...
    Scottie_uk Scottie_uk February 2008 Chit chat
<1234567…34>

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