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  • 128K RAM tester as .TAP?I was sure that I've seen a RAM tester that can be loaded with e.g. DivIDE or DivMMC EnJOY! as .TAP. But I can't find it (been searching through the …

    ... that I've seen a RAM tester that can be loaded ... 128K machines, and if lower RAM works fine, and there is ... a small error in upper RAM.

    I have a ...
    bverstee bverstee January 2015 Hardware
  • Wanted: RAM Turbo InterfaceHi guys I am on the lookout for a RAM Turbo interface so anyone has any going spare then please give me a heads up. Cheers

    Hi guys

    I am on the lookout for a RAM Turbo interface so anyone has any going spare then please give me a heads up.

    Cheers
    CU_AMiGA CU_AMiGA January 2015 Wanted
  • Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …

    ... what I think is a RAM issue.

    I used ... that device is a 128K RAM test firmware.

    When ... [/url], page 4) means that RAM page 5 has an issue ... the PCB is for which RAM page?

    I?m ...
    CRNorris CRNorris February 2015 Hardware
  • Finally got round to itFinally got round to giving my old speccy a close look. Details 1982 Issue 2 Seriel No 001 196193 Hmm... Followed the initial tests on You tube w…

    ... fail then

    Lower ram tested on 200Kohm range
    IC 26 as a patch, is ... this usual ?

    IC 23 to IC 26, IC1, IC5 socketed ... but not IC 3 and 4 ?
    Upper ram socketed
    woollymammoth woollymammoth February 2015 Hardware
  • Loads of Microdrive cartridges on Ebay plus Vortex RAMI?ll be selling three bundles of eight Microdrive cases with four, used cartridges each, means 32 cartridges per bundle, here?s one of them [img]http…

    ... an untested Vortex SP 512 RAM expansion with CPU and ULA ...
    schombi schombi February 2015 Sales
  • ZX81 simple 16K modHi everyone! For the black & white addicts among us, :-B I've put up a web page detailing how I expanded a few of my ZX81's to 16 KB: <a href="…

    ... 's other places where ZX81 RAM expansions can be found. But ... , shortest possible wiring, minimal changes. RAM chip, IC socket, ~10 cm. wire ... , that's it. RAM chip goes into ...
    RetroTechie RetroTechie July 2015 Hardware
  • ZX Spectrum issue 2 has only blue tintsRecently I've bought a 16k speccy and ran into some issues with it. Faulty keyboard, broken caps, no stable frequency, faulty lower RAM chip, it bein…

    ... caps, no stable frequency, faulty lower RAM chip, it being 16k, ... ), switched out the lower RAM for a modern solution and ... modern 32k ram upgrade installed.

    ... chip(ULA5C112E-3) might be faulty and could explain both issues ...
    Relo999 Relo999 August 2015 Hardware
  • Another silly hardware idea - RAM Pack adaptorHow about a mini bit of PCB that adapts ZX81 RAM Packs to replace the address space of the Spectrum's ROM? I guess practically you'd need a way to…

    ... of PCB that adapts ZX81 RAM Packs to replace the address ... well just design your own RAM board.

    Could have ...
    joefish joefish September 2015 Hardware
  • Turbo RAM Glitch or feature ?I have been testing a Spectrum [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000328"]worldofspectrum.org/infoseekid.cgi?id=1000328"]RAM Tur…

    ... .org/infoseekid.cgi?id=1000328"]RAM Turbo Interface[/url].

    RMartins RMartins September 2015 Hardware
  • The Tripods C64 version / faulty Spectrum copies?I'm an occasional contributor to the website 'Games That Weren't' which researches unreleased games, particularly for the C64. One game they're looki…

    ... ? Or do you have a 'faulty' Spwectrum copy in your attic ...
    MartinUK MartinUK October 2015 Games
  • Weird crashing problemOK, got an odd (to me anyway!) problem. 16k Spectrum, appears to work fine, it starts up, go to load a game (Trans Am, Cookie, Jetpac etc), the game …

    ... at all if the lower RAM was faulty?

    Thanks ...
    Jet5y Jet5y October 2015 Hardware
  • Another hardware question - lower 16k bad?Like in my last question, I am referring to this video from JoulesperCoulomb (https://www.youtube.com/watch?v=IzgCmldm2H4), this time, it is with the…

    ... like mine) means the IC's are probably faulty. Mine is reading ...
    cbmeeks cbmeeks October 2015 Hardware
  • Testing a RAM packI had my Spectrum + today which is working, but i also had a ZX Spectrum 32k RAM Pack and i wanted to test it. Is there anyway i can test this on the…

    I had my Spectrum + today which is working, but i also had a ZX Spectrum 32k RAM Pack and i wanted to test it. Is there anyway i can test this on the Spectrum + and if so how ?

    thanks
    morcar morcar October 2015 Hardware
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... speccy, dead cockroach with 32K Ram pack installed. Lo and behold ... and the left-most lower RAM chip getting red hot. I ... promptly and snip all lower RAM chips supply legs. Switch back ... to put some good lower RAM in? If so, I could ...
    namtip namtip November 2015 Hardware
  • +2 Gray ProblemI'm trying to repair a +2 gray that behaves differently at every boot up. Some rare times I can get the selection window but pretty soon the characte…

    ... containing Paul Farrow's 128k ram testing program. New Z80 tested ... Data Line 5[/b]" at RAM Bank 0 and 2 and ... -FFFF.
    Also the message "RAM Paging Works Correctly" at the ... IC (or ICs) need changing? It must be on the contended RAM ...
    gtsamour gtsamour May 2016 Hardware
  • Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…

    ... PCB) because half of the RAM was faulty, but how many nano ...
    georgedb georgedb August 2016 Hardware
  • Redesigning the ZX Spectrum 128k - A lifelong dreamHello, I am myPinballs (Jim) and i run a small business here in the uk making replacement 8-bit hardware pcbs for arcade pinball games as well as…

    ...
    • 8 pages of 16k ram 128k total
    • High quality ...
    • Uses the 128k ULA IC - Ferranti 7K010E/Amstrad 40056
    myPinballs myPinballs August 2016 Hardware
  • Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…

    ... a problem with the upper RAM however on running the soak ... minutes. I also performed the RAM test detailed here http://www ... longer or look for non-RAM related issues?
    britain4 britain4 October 2016 Hardware
  • What could've happened to this Spectrum?Just some speculation here. I picked up +2 grey recently, and have been wondering what work may have been done on it, as it has an 'ace repairs' war…

    ... , 8638). It looks like the RAM chips of the 8640 model ... wondering, is this type of IC commonly used as a replacement ... IC for IC24? It got me ... it possible to damage the RAM of a +2 by pulling ...
    Jim M Jim M October 2016 Hardware
  • Creating a POK from RAM or binary.Don't know if this is the right category or not but here goes. I'm working on a bug fix for a game, it's a few hundred bytes worth of custom code …

    ... said file from a set RAM location or a binary? I ...
    Ersh Ersh October 2016 Development
  • Faulty DRAM chips wanted!If you have any suspect or known faulty DRAM chips, I'm after some so I can conduct some testing. I only want chips that are DIL type, either 16 p…

    ... have any suspect or known faulty DRAM chips, I'm after ...
    1024MAK 1024MAK November 2016 Wanted
  • help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…

    ... before I order a lower ram set.
    cypher007 cypher007 December 2016 Hardware
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    ... about the upper part of RAM and that crashes the same ... figured it might be a faulty ROM (despite passing the checksum ...
    Jet5y Jet5y January 2017 Hardware
  • zx.zigg.net lower RAM replacement module: Still shipping?Hi everyone I'm trying to resuscitate my 48k issue 6a, and I bought the lower RAM replacement module from zx.zigg.net. The paypal payment went thr…

    ... , and I bought the lower RAM replacement module from zx.zigg ...
    Mikelone Mikelone January 2017 Hardware
  • ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: [url="https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcE…

    ... was replaced ULA, CPU, ROM, RAM, (same thing with original and ... .zigg.net) LM1889N, all 74LSxxx IC, two quartz crystals all transistor ...
    skydiver021 skydiver021 March 2017 Hardware
  • ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcEY4ajVk…

    ... was replaced ULA, CPU, ROM, RAM, (same thing with original and ... .zigg.net) LM1889N, all 74LSxxx IC, two quartz crystals all transistor ...
    skydiver021 skydiver021 March 2017 Hardware
  • RAM questionI've been meaning to upgrade my desktop pc's ram for ages now as the 4GB it has isn't cutting it anymore but im confused about what ram my motherboar…

    ... my desktop pc's ram for ages now as ... but im confused about what ram my motherboard will support.< ...
    The motherboard has 4 ram slots 1 taken by the ... i dont know what ram is compatible and what ...

    in its ram section for the motherboard but ...
    festershinetop festershinetop March 2017 Chit chat
  • Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…

    ... a 16K model with a faulty keyboard ( dont they all). When ... it was an upgrade (OKI ram chips Btw)
    She passed ... where it says for Oki ram to work with a Issue ... must go to ground..... (OKI ram low enabled)......ahhhhh maybe this ...
    povvercrazy povvercrazy April 2017 Hardware
  • ZX Diagnostics v0.35 ReleasedHi all, I'm pleased to announce the release of zx-diagnostics v0.35, downloadable from [url="https://github.com/brendanalford/zx-diagnostics/relea…

    ... /> - Add failure beeps if a RAM issue is detected in soak ... ICs if all 48K upper RAM is faulty (as opposed to missing ...
    balford balford May 2017 Hardware
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Latest Posts

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