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Search Again :: Adv Search 1000 results in 0.016s
<1234567…34>
  • Issue 1 16K RAM bankFolks, I recently had a chance to fix a couple of Issue 1 boards, and learned the hard way that the chips in the 16K RAM bank have a different place…

    ... to fix a couple of Issue 1 boards, and learned the ... (IC13...IC6)

    with Issue 1, chips arrangement is D7 ... . Sigh.

    The Issue 1 board layout is not documented anywhere, to ... quick search in the message board archives does not reveal anything ...
    Falco-F8L Falco-F8L January 2015 Hardware
  • Board schematic files.Where do I go to download Board Layout and Schematics these days?- All up to Issue 6a boards. It's time for some tinkering!

    Where do I go to download Board Layout and Schematics these days?- All up to Issue 6a boards.

    It's time for some tinkering!
    Graz Graz September 2016 Hardware Preservation
  • 32K Expansion board for issue 1 SpectrumI realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently. Don't …

    I realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently.

    Don't mind if it's an original or third-party, or even if it's working.

    Thanks!
    B
    balford balford December 2013 Wanted
  • Which ULA to fit in which issue SpectrumI spent a little while studying the resistor changes on page 30 of the ZX Spectrum 48K service manual. They all concern aspects of the video circuit …

    ... ULA for that board.

    All issue one boards are ... earlier.

    Issue two is the board with the widest range ... although this was made after Issue two ceased production. The ... to check which version your Issue two board is configured for is ...
    rga24 rga24 April 2014 Hardware
  • DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…

    ... incompatibility with this specific 128k board issue that was somehow overcame ... />
    I think the issue which you identified with the ... basically down to the circuit board - presumably some of the ... timing to match the circuit board layout - a lot of hardware ...
    rwap rwap February 2008 Hardware
  • 16 K Sinclair Spectrums Still Available?Hi. I wanted to know if the 16 K Sinclair Spectrums are still available to buy. I have looked around on the net without any success. Maybe someone kn…

    ... that are truly collectible are issue one machines. These were the ... manufactured and have a different board layout to the later Spectrums without ... 48K ones required an additional board that hangs upside down in ...
    Matt_B Matt_B May 2009 Sinclair Miscellaneous
  • Spectrum Video Circuitry.Wotcha, I've looking at the circuit diagram of the speccy video circuitry (Hey, I'm snowed in, and theres only so much Civ IV i can stand :p), and I…

    ... needing to change the circuit board layout.

    [QUOTE]I assume ... be right... I checked an issue 4B board, but didn't find ...
    RetroTechie RetroTechie January 2010 Hardware
  • Spectrum +3' AY sound issuesHi everyone - first time poster. I just got a Spectrum +3 for Xmas, and I am over the moon at this - I used to write games which I have here on 3" d…

    ... these two pics of issue 1 vs issue 2 +3 boards:< ... ]

    yes the board layout was changed certainly. A diode ... is soldered on underneath his board.

    It ... there were errors on the board layout, or at the least ... I'm aware, just board layout.
    guesser guesser January 2011 Hardware
  • ZX Spectrum not working... issue 4S?Hi, I've bought a "new" broken ZX Spectrum +. The idea was to put an harlequin board inside, but for the moment I'm trying to put it in working order…

    ... , I'm worried about the board layout.

    TR4 and TR5 ... board says it's an [b]Issue 4S[/b]. Neither schematic nor layout ... .
    - Looking the schematics from Issue 4A/B, I've tried ...
    Zup Zup February 2012 Hardware
  • Divide CF cardsI have recently got a Divide but I'am waiting for my Compact Flash card to come form Amazon. However, the Divide states that the CF card needs to be …

    ... with any joysticks. The hardware issue is the lack of a ... as such or will the board layout need rerouted?

    Which ...
    toadstool toadstool May 2012 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... a copy of my circuit board layout either, though it appears this ... has been tested in an issue 2 Spectrum. Careful selection of ... 't work reliably in an issue 2.
    Zorn Zorn October 2013 Hardware
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... at the bottom of the board which will not react kindly ... 's an Issue 4S he's working on - the board layout is designed ... don't have a 4S board to look at right now ... add: Ok, I have an Issue 4S to hand, brb :)
    DEATH DEATH November 2014 Hardware
  • Issue 1 schematics?I'm fault-finding an issue 1 board. So far I've found a hot memory chip and snipped it's supply legs, then swapped the burnt-out 7805 for a switched…

    ... at least you get a issue 1 board layout...
    http://www.worldofspectrum ...
    1024MAK 1024MAK November 2015 Hardware
  • Issue 1 schematics?I'm fault-finding an issue 1 board. So far I've found a hot memory chip and snipped it's supply legs, then swapped the burnt-out 7805 for a switched…

    ... at least you get a issue 1 board layout...
    http://www.worldofspectrum ...
    namtip namtip November 2015 Hardware
  • 12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…

    ... the same. The board resembles the issue 3 board schematic not the 3b ... . If I look at the component layout ... 't find on the board layout, or the actual board. C7 or whatever ... schematic, it is on the issue 3 schematic though. How would ...
    patzik patzik April 2016 Hardware
  • Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…

    ... />
    A variable sized board could begin at 32 bytes ... actually create the initial layout of the board could probably be ... therefore not really needing the board layout data as part of the ... success in soling the glitchy issue. Silly mistake with a BIT ...
    Arkannoyed Arkannoyed February 2017 Development
  • ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …

    ... on the new Test board is above the main ... a design issue with the ULA. On issue 3 and ... later boards, TR6 is included on the board layout ... a picture of an issue 2 board where this has been ... link back to the Spectrum board. Only use enough cable ...
    1024MAK 1024MAK July 2017 Hardware
  • Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…

    ... here[/url] and the board layout is on WoS [url ... pub/sinclair/technical-docs/ZXSpectrumIssue3b-Layout.gif"]here[/url].
    issue 6A) design ([url="http ... this is only for issue 4S boards or if ... it affects other issue boards.

    ...
    1024MAK 1024MAK July 2017 Hardware
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    There's definitely a "known issue" with RAM timings on the ... at the factory on Z70833 issue 1 boards, and incorporated into ... the PCB on issue 2 and 4. It couldn ... the fact that it's board layout dependent are anything to go ...
    guesser guesser November 2017 Hardware
  • Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…

    ... biggest difference being the circuit board layout, I think.
    [quote="Renegade ... check on my grey +2 board issue 1.[/quote]
    Absolutely. The ...
    Ast_A_Moore Ast_A_Moore January 2018 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... chips is broken?
    Board is Issue 4S and upper memory chips ...
    lillaolle64 lillaolle64 October 2010 Hardware
  • So easy to use.Back in the 90s I was off work for 3 months following an operation, anyway in my boredom I dusted off my old speccy+ and the manual, and got my head …

    ... !
    The drawing of the board layout and pegs etc was not ...
    RetroGamerUK RetroGamerUK December 2011 Sinclair Basic
  • HxC Floppy Drive Emulator - help neededHi! I?m really having difficulties with my new HxC SD card floppy emulator on a Spectrum +3. It?s REV C cased light gray, with no labels on it, so I…

    ... -cased version only, where the board layout seems to be different). It ...
    schombi schombi November 2012 Hardware
  • 128k toastrack with an amstrad ULAI received a 128k toast rack today with an "amstrad" ULA fitted, I'm wondering if this is fairly common or more rare, presumably manufactured after t…

    ... an image of the main board, and issue 6U

    [url ...
    smogit smogit February 2013 Hardware
  • Superfo Harlequin Rev D Documentation wantedI have a Rev D Superfo Harlequin PCB. I would like the documentation (schematic and board layout files), but I get a [b]Not Found[/b] error when I cl…

    ... like the documentation (schematic and board layout files), but I get a ... of the documentation for this board revision please?

    Or ...
    1024MAK 1024MAK October 2015 Hardware
  • ZX Speccy +2A - B&W & snowy RF output + other issuesHi All, I am new to this forum and I am back to the Spectrum world after 25 years. Recently I've bought a second hand +2A (+2B board - Z70833 Issu…

    ... second hand +2A (+2B board - Z70833 Issue 1) as a DYI project ... . Built a proper composite output board based on the +128k design ... seems to be a mechanical issue.
    4. A few function ...
    Claudius Claudius October 2016 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... interesting an issue 2 16k ZX Spectrum board. The issue 2 board was part ... quite a mess of the board with poor soldering/skills trying ... />
    So to begin, this board was an eBay buy. Described ... in the auction showed the board was powering up but producing ...
    Your Spec-chum Your Spec-chum August 2019 Hardware
  • s-video SuccessHaving tried the various composite video fixes for the +3 etc, I was left feeling a little cold at the results, and was about to give up my quest for…

    ... adaptor, both the schematic and board layout in the zip file are ...
    dasteph dasteph April 2005 Sinclair Miscellaneous
  • Sound mod for AY audio chipsHi again. This is a repost. I posted it in the misc forum a while back but it definitely should be in here. I was totally pissed off with the crap…

    ... work it out from the board layout, but hey. Just that I ... was intending to redraw the layout for that instead.

    board, power supply etc. A sort ...
    dasteph dasteph December 2005 Hardware
  • Dead +2B, help required...It was bought defective on ebay. It came with two faults: a "dead" power supply (it was the fuse) and a faulty main unit. The power supply is now re…

    ... +2B, made in taiwan, board Z70833 issue 1. I'm trying to ...
    Zup Zup March 2007 Hardware
<1234567…34>

Latest Posts

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