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Search Again :: Adv Search 1000 results in 0.020s
<1234567…34>
  • Black paper, white border. Ram fault?We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working o…

    We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working one, and we got the same result.

    is this a ram fault? How can we check ram chips?
    Arda Arda December 2006 Hardware
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... a tricky to diagnose upper RAM fault, so I thought I ... usually indicates a fault with the upper RAM or the logic ... upper RAM, but I was unable to find any fault by ... passed from testing lower RAM to upper RAM. Here is an ... I couldn't reveal the fault from BASIC. I can ...
    Zorn Zorn April 2012 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... process still had some issues, so a large number ... also did the composite video mod as troubleshooting this ... to mean a lower RAM fault, ie something in the ... the machine gave the same fault. Due to the fruity ... which has a RAM test, the original fault when I ...
    Womble Womble August 2010 Hardware
  • How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…

    ... assign the first K of ram to video memory and the rest ... is accessing the higher order ram (> 16K) the ULA (or ... is when writing to the video memory, beautiful :) So using the ... chip only needs 1K of video memory and the second chip ...
    Robin Robin January 2011 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... got my new upper ram replacement module from Zorn ... Divide on it (original divide), issues start to appear.
    < ... manages to boot, the ram passes the memory test i ... When I put the upper ram chips back in place, ... DMA to the upper RAM and uses unusual timings ...
    gtsamour gtsamour September 2013 Hardware
  • 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…

    ... some diagnosis.

    the fault occurred about 13years ago whilst ... the upper memory but the fault is still there.

    fault? or is my rom scrambled ... before I order a lower ram set.
    cypher007 cypher007 December 2016 Hardware
  • Using a thermal camera to fix speccy's.Hi All, Thought I'd share another repair... Got a board that collapsed the bench supply straight away ( I run a bench supply and give it just enou…

    ... . As long as the RAM isn't damaged, it ... s not indicative of a fault at this stage - it ... jpg[/img]
    32K RAM chips, and the cap near ... The two caps near the video modulator... ( One visible in ... change unless there's video issues. The video is very clean on ...
    cj7hawk cj7hawk January 2022 Hardware
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    ... try to diagnostic a probably RAM fault on my +2 grey
    RAM ics KM4164B-12 [B]only ... i can identify the faulty RAM ic?
    any tips will ...
    xaris_sm xaris_sm March 2013 Hardware
  • Seriously weird Issue 2 issue... (RAM-related)Hi guys; I have been trying to fix up my Issue 2 and have run across a bizarre issue that I haven't seen elsewhere in the forums. Hopefully one of …

    ... /> 2. MEMCHK returned 32767, upper RAM fault. UPRAM85 returned 93, so IC18 ... "black screen and red bars" RAM test appears, after which the ...
    Trafferth Trafferth August 2014 Hardware
  • Issue 2 Spectrum - Black screenHi I have an issue 2 spectrum which I'm having some issues with. I bought it on ebay so have no idea of the history or how it came to be broken. Whe…

    ... which I'm having some issues with.
    I ... that this is an upper RAM fault.
    As instructed I ... get the corresponding upper RAM location and sure enough ... some of the lower RAM chips about to different ... to the upper RAM and the fault stayed with those ...
    whoremoan whoremoan November 2014 Hardware
  • 48k issue 2 video issueHi folks. I am currently tring to fix an issue 2 board. I was getting the yellow greenish screen. (also there there is a lower ram fault with it i th…

    ... there there is a lower ram fault with it i think) I ...
    Firefox11 Firefox11 January 2015 Hardware
  • Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …

    ... itself never reported finding a RAM fault while testing lower or upper ... never stop generating a valid video signal, even if the pixels ... normally occurs in a proper video signal. For example, I ... still think this video defect must be a fault, but I don ...
    Zorn Zorn February 2016 Hardware
  • Spectrum 128 video issuesIf you can tolerate 30 seconds of awful generic music, have a glimpse in my video below. I have muy toastrack hooked on RGB and I have flicker and…

    ... , have a glimpse in my video below.

    I have ...
    Pyjamarama Pyjamarama March 2016 Hardware
  • Troubleshooting RAM IC's on Spectrum +2 Grey?Got myself a grey +2 but at startup it shows something very similar to this: [img]https://preview.ibb.co/mmai5F/2_Ram_Fault.png[/img] I also su…

    ... also suspect there is a RAM fault but how can I identify ...
    Renegade Renegade July 2017 Hardware
  • Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…

    ... It's most likely a RAM fault since initialisation seems to have ... getting hot. Especially the 4116 RAM chips. Change any 4116 ... /> 4) Test upper RAM - sometimes, bad upper RAM just stops working so ... disagree with me on certain issues. Thing is, it all ...
    DEATH DEATH July 2007 Hardware
  • Broken speccys on ebayI often see broken speccys on ebay,the usual listings of no display on pic etc,i know could be opening a can of worms when buying one,so can [B]some[…

    ... the unit for sale has video output but some keys don ... is more than likely a RAM fault since the processor must be ... the ULA is producing a video signal etc... (Somebody is bound ...
    alien8r33d alien8r33d May 2010 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…

    ... mac is still sharing the ram between video and cpu, too, wheras ... actually doing anything with the video hardware. If it's purely ... and fixed most of the issues with the Amiga 1000 that ...
    Matt_B Matt_B August 2011 Sinclair Miscellaneous
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... some PEEKing in the video memory to see whether ... unwanted artifacts are in RAM or are being created ... I could see if the fault follows the ULA...
    ... indicate a ULA video fault) rather than a RAM fault as the ... also stored in the lower RAM.

    You ...
    1024MAK 1024MAK July 2013 Hardware
  • Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…

    ... 128K hardware issues, but it does sound like a RAM fault. A loading ...
    balford balford August 2013 Hardware
  • Faulty 48+Hi I picked up a pile of Spectrum kit including a boxed "untested" 48k+ The Speccy boots to this screen... [IMG]http://www.scotek.net/zx spectrum/…

    ... rather like a typical lower RAM fault. Are all the power supply ... .com/watch?v=IzgCmldm2H4[/URL] video for where to measure.
    Zorn Zorn February 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... it fixing poor, dark grey video issues, so I was expecting this ... 't include part of the video signal known as the back ... . This is different to your fault. The early ZX81 ULA chips ...
    1024MAK 1024MAK September 2014 Hardware
  • 48K Not booting properlyBought another faulty spectrum from Ebay. This one, when you turn it on, it looks like it's going to boot OK, but when it gets to the point where it…

    ... , or keyboard reading issues.

    Given the fault description I'd ... this sounds like an upper RAM fault and that the ULA is ...
    balford balford January 2015 Hardware
  • Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…

    The ULA generates the video picture. The LM1889 (a colour ... component video signal to a composite video signal).

    Your fault has ... "lower" RAM fault, an RAM address or data bus fault or a ULA fault.
    1024MAK 1024MAK May 2015 Hardware
  • 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…

    Video does not work for me ... It could be an unusual fault with the CPU or the ... okay.

    All the RAM chips are DRAM type. In ... variations of symptoms of a RAM fault. The problem with your ... or may not be a RAM fault. But RAM faults and faults with ...
    1024MAK 1024MAK January 2017 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…

    ... it could still be a RAM fault.

    If you ... that there is a lower RAM fault.

    Note that ... only ever displayed a monochrome video picture. He tried everything he ... it produced colour video. The only remaining fault was a faulty keyboard ...
    1024MAK 1024MAK August 2019 Hardware
  • ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…

    ... , it’s not a RAM fault. And RAM faults don’t cause the ... or a very strange hardware fault. It is well worth trying ... like they run without any issues.

    It is also ...
    1024MAK 1024MAK September 2019 Hardware
  • Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…

    ... /> - CPU: Z80C
    - RAM: >= 512k
    - Video RAM: 256k (512k)
    - ROM ... : 64k (128k)
    - Video: Standard VGA ...
    pern pern August 2004 Sinclair Miscellaneous
  • Newbie question about my unwell Spectrum...Hi - I have had a couple of dud 48K Issue 3 Spectrums in the loft for 20 years or more. One would initialise sometimes but could not be guaranteed t…

    ... from WOS I traced the fault to a missing -5V rail ... suspect this could be a RAM fault because IC6 and IC11 run ...
    weathereye weathereye February 2011 Hardware
  • +2 OverheatingMust first give thanks to Dazza75 for supplying me a replacement +2 however it seems to be overheating and corrupting graphics in games making them u…

    ... this may be?

    Ram fault? ULA loose. If it requires ...
    zerohour zerohour June 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... 't made any difference. The fault remains.

    A visual ... I be looking at a RAM fault?

    Ideas anyone ...
    ramsrc ramsrc October 2012 Hardware
<1234567…34>

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