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<1…28293031323334>
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... /> [*]If you can program an EPROM, sort yourself out a very ... of doing your own test EPROM, use someone elses... (see [URL ...
    velesoft velesoft August 2012 Hardware
  • divide loading errorsHi All, Just bought a divide unit and I am having a few problems. I select the TAP file from the fatware browser, then do a load "". I get a lot of …

    ... and will copy them to eprom and see if they make ...
    jagman5994 jagman5994 August 2012 Hardware
  • Sixword Swift Discjust got hold of one for ?25, bloke sold it as not working etc plugged in and it works a treat :-D the ROM version is 2.4 is there anywhere where i …

    ... you will need a 27C256 eprom.

    2.4 version ... 27C128. The hardware allow both eprom.

    Bye

    Jose_Leandro Jose_Leandro August 2012 Hardware
  • Sixword Swift Discjust got hold of one for ?25, bloke sold it as not working etc plugged in and it works a treat :-D the ROM version is 2.4 is there anywhere where i …

    ... you will need a 27C256 eprom.

    2.4 version ... 27C128. The hardware allow both eprom.

    Bye

    reanimator reanimator August 2012 Hardware
  • THE ROM CHIPSDoes anyone know which are the ROM chips in ZX Spectrum 128K +2?

    Is there a schematic to change the rom in a +2 (Grey) for an eprom?.
    napoleonblownaparte napoleonblownaparte August 2012 Hardware
  • THE ROM CHIPSDoes anyone know which are the ROM chips in ZX Spectrum 128K +2?

    There's no need to change anything in the +2 grey to put an EPROM instead of ROM, isn't it? So no need for a schematic (unless you can't locate the ROM chip in the PCB)
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • My +2 Guinea PigA grey +2 I bought to perform my experiments on, it's had it's ROM replaced with a 27C256 with Open SE Basic onboard, combined with the Gosh Wonderfu…

    ... the second page of the EPROM instead of the standard 48k ...
    napoleonblownaparte napoleonblownaparte 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…

    ... the FPGA and the platform EPROM accordingly, that the configuration loading ...
    mcleod_ideafix mcleod_ideafix August 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…

    ... first 64kB block of flash eprom chip
    - press keys "w ...
    jayteebee jayteebee September 2012 Announcements
  • Divide HELP!Can someone help me out here? In order to get the latest and best version I'd need these. The Divide itself for ?40: [url]http://www.sellmyretro.co…

    ... first 64kB block of flash eprom chip
    - press keys "w ...
    jayteebee jayteebee September 2012 Hardware
  • Assembly game programming on ZX how-to?Hi. I'm planning to build and release new software for the Speccy but I'm pretty lame as to handle its hardware despite a good mastery of Z80 assembl…

    ... me. I even burnt an EPROM with a built-in disasm ... a now lost EP-100E EPROM burner (miss it too much ...
    pkersey pkersey September 2012 Development
  • Spectrum in black TS1500 case with grey "Sinclair ZX Spectrum" labelAt the Spectrum30 event yesterday, someone had brought a Spectrum like object with an unusual case and I never did find out whose it was or where it …

    ... computer with Terminal program on EPROM.
    I do have images ...
    Encarnado Encarnado September 2012 Hardware
  • EPROM PiggybackIs it possible to piggyback 2x EPROM's I heard someone mention it but don't know if its possible? I have 27c256's and 27c512's that I'm experimenti…

    dunno about the speccy , but on the BBC I have a socket which has banks on , and you use a switch on it to change bank (the eprom has more than 1 bank)
    fog fog September 2012 Hardware
  • EPROM PiggybackIs it possible to piggyback 2x EPROM's I heard someone mention it but don't know if its possible? I have 27c256's and 27c512's that I'm experimenti…

    ... up.

    Piggybacking an EPROM is simply doing the same ...
    RetroTechie RetroTechie September 2012 Hardware
  • Micro Command Speech Module(This is at the request of a certain Roger Jowett....) He has a micro command speech module - [url]http://www.worldofspectrum.org/infoseekid.cgi?id=…

    EPROM 2716 2KB
    RAM 6116 2KB
    superfo superfo 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…

    ... first 64kB block of flash eprom chip
    - press keys "w ...
    baluba baluba September 2012 Announcements
  • Micro Command Speech Module(This is at the request of a certain Roger Jowett....) He has a micro command speech module - [url]http://www.worldofspectrum.org/infoseekid.cgi?id=…

    A little review I did about this interface, in the speccy.org forum, including EPROM disassembly and high res pictures.
    [url]http://foro.speccy.org/viewtopic.php?f=8&t=2052&p=21812[/url]
    mcleod_ideafix mcleod_ideafix October 2012 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... find someone who has an eprom programmer, he or she could ... substitute by programming a 27c128 eprom with the spectrum rom code ...
    Knik Knik October 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... ]So i finished the " 74ls32" eprom modification , (..)[/QUOTE]
    I' ... are referring to. :-? An EPROM can take the place of ... for using an EPROM I think.

    EPROM contents will 'leak ... & reprogramming a fresh EPROM might solve the problem.
    RetroTechie RetroTechie October 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... you are referring to. :-? An EPROM can take the place of ... (socket) are correct for the EPROM (27(C)128?). There's ... ]not[/I] for using an EPROM I think.[/QUOTE]
    The ... ORed and fed to the EPROM /CE or /CS input. Hence ...
    1024MAK 1024MAK October 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... />
    Which would make the EPROM enable its output if (A15 ... checking.

    And presto: EPROM working fine, no extra LS32 ...
    RetroTechie RetroTechie October 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... it , it had an eprom , pin 27/28 connected ... verify the change in rom//eprom , and with the ... swop of rom vs eprom cannot work becouse of ... both possibilities ( rom and eprom ) is to modify pin ...
    I also verified the eprom , arranged a fresh one , and ...
    techy techy October 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... :-) the use of a standard EPROM is anticipated there.
    roko roko October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... designed to be blown to EPROM chips do not have to ...
    1024MAK 1024MAK October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... designed to be blown to EPROM chips do not have to ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... update: burned a 128K test EPROM from Fruitcake, ran the test ... , and each time the test EPROM faithfully reported the missing bit ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • [Free] BBC MasterHopefully this thread is OK with the mods, Figuring (1) its a freebie and (2) we all like preserving older hardware anyway. Right then, I need to re…

    ... a 2/3 way switch eprom so it can pretend to ...
    fog fog October 2012 Sales
  • [Free] BBC MasterHopefully this thread is OK with the mods, Figuring (1) its a freebie and (2) we all like preserving older hardware anyway. Right then, I need to re…

    ... a 2/3 way switch eprom so it can pretend to ...
    spider spider October 2012 Sales
  • [Free] BBC MasterHopefully this thread is OK with the mods, Figuring (1) its a freebie and (2) we all like preserving older hardware anyway. Right then, I need to re…

    ... -64k and master.. on a eprom / 3 way switch on the ...
    fog fog October 2012 Sales
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    Usually the /OE-to-Output time is much shorter than the /CE-to-Output time.
    So one might think about grounding /CE and doing the complete Eprom selection by means of /OE, when it indeed is a matter of timing.
    roko roko November 2012 Hardware
<1…28293031323334>

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