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Search Again :: Adv Search 1000 results in 0.022s
<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 ... produced a mainly black screen with various coloured squares ... upper RAM, but I was unable to find any fault ... couldn't reveal the fault from BASIC. I can ...
    Zorn Zorn April 2012 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…

    ... diagnosis.

    the fault occurred about 13years ago whilst ... message, but the main screen is filled mostly in magenta ... the upper memory but the fault is still there.
    ... more likely a lower memory fault? or is my rom ... I order a lower ram set.
    cypher007 cypher007 December 2016 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 …

    ... 48k
    Initial problem: Yellow screen, only sees 16k.
    < ... 2. MEMCHK returned 32767, upper RAM fault. UPRAM85 returned 93, so IC18 ... Then the "black screen and red bars" RAM test appears, after ... black paper / yellow border screen or does the loading ...
    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…

    ... with various output to the screen every time I turned the ... . either coloured garbage or back screen with thin red lines.
    screen. You could almost say though ... that this is an upper RAM fault.
    As instructed I measured ...
    whoremoan whoremoan November 2014 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
  • 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…

    ... yellow greenish screen. (also there there is a lower ram fault with it ...
    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 …

    ... RAM. A few errant pixels and attribute squares appeared on screen ... never reported finding a RAM fault while testing lower or ... ENTER at the initial screen) I quickly noticed ... br /> - Occasional display synchronisation fault on entering/editing program lines ...
    Zorn Zorn February 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
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... a program that writes to screen RAM every bit pattern, and ... 7800) and copies it to screen RAM, hence testing write and ... +2 now: I have suspected ram fault (coloured flashing blocks). I first ... rom. Spectrum initialized and screen looked just like in emulator ...
    Timppa Timppa September 2005 Sinclair Miscellaneous
  • Bah, Spectrum+ has diedBah. My Spectrum+ appears to have died. On power up, the 'paper' part of the screen goes black (and you see the faint red lines that you normally se…

    ... , the 'paper' part of the screen goes black (and you see ... Spectrum overwrites all of RAM on boot - bad RAM >perhaps?[/QUOTE ... was a chip of upper RAM.

    A probe you ... then spectrum has a upper ram fault.

    Bye

    Jose_Leandro Jose_Leandro July 2006 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…

    ... from the messed up screen of a borked spectrum? ... people post asking "my screen looks like......, what's ... by looking at the screen exactly what's wrong ... can be seen on screen as just multi-couloured ... 's most likely a RAM fault since initialisation seems to have ...
    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[…

    ... black central screen area is more than likely a RAM fault since the ...
    alien8r33d alien8r33d May 2010 Hardware
  • Fuzzy Screen On 48k Spectrum.Hi there. I bought a Spectrum off eBay last week (another for my collection lol), and it suffers with a fuzzy screen e.g. it looks like interference …

    ... it made no difference. The screen was still fuzzy, and the ... which turns up on the screen every now and then :/
    RAM fault, which IC number(s) could ... 't seem to find a fault when testing this machine and ...
    Jimbob-Squarepants Jimbob-Squarepants February 2011 Hardware
  • ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…

    ... on the screen then I suspect a short or similar fault on ... be a CPU/ULA/ROM/RAM fault.

    I remember reading ...
    Zetr0 Zetr0 March 2011 Hardware
  • No video in Spectrum 128k +2A Grey[B][COLOR="red"]EDIT: 26-05-2012 = Thread topic edited[/COLOR][/B] Hi everyone, Recently i won a Spectrum 128k +2A Grey at ebay UK. The Spectrum …

    [QUOTE=guesser;631642]I suspect a RAM fault.

    What happens if you power on while holding the break key?[/QUOTE]

    I already try that.

    Nothing, full black screen.

    The ram are the 2 chips near the Z80 CPU ?
    g40rocket g40rocket June 2012 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…

    ... sometimes get noise lines across screen within five minutes. It keeps ... . My main suspicion is a RAM fault to be honest I really ... forgive my vague description or fault finding info.

    Also ...
    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…

    ... of returning to the introduction screen after all lives were exhausted ... must be due to a RAM fault that only affected a very ... . I replaced it and the fault went away.
    Zorn Zorn October 2012 Hardware
  • 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…

    ... put sockets down for the RAM and perhaps the CPU.
    screen it was a (lower) RAM fault. There was another ... -speaker buzzing was probably the RAM.

    @Zorn: Thanks for ...
    Trafferth Trafferth May 2013 Hardware
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    ... called lower RAM (used for the screen so sometimes called the screen RAM) is ... />
    The so called upper RAM also uses eight DRAM chips ... best way of fault finding a suspected RAM fault is to use a ...
    1024MAK 1024MAK August 2013 Hardware
  • ZX Spectrum + Please help!I wonder if anyone can help? I purchased a ZX Spectrum + from a Car Boot Sale last year, boxed, with games and leads. The problem is, it won't tune i…

    ... 'flash'...[/QUOTE]

    A screen with a white border and ... typical symptom of a RAM fault and/or a fault with the internal ...
    1024MAK 1024MAK January 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... is also possible that a RAM fault is causing the CPU to ... in the top part of RAM becoming corrupted.

    ... 48k machine with the "upper" RAM in sockets? If yes, remove ... ,

    No, the RAM is soldered in.
    But ... I still get the copyright screen?
    Brian Brian April 2014 Hardware
  • 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…

    ... , so using Zorn's RAM replacement module works, but ... place on screen.

    So it is a RAM fault, but ... rather than a chip fault. As moving the chips ... does not move the fault. The problem appears to ... a fault with the socket that Zorn's RAM replacement ...
    1024MAK 1024MAK April 2014 Hardware
  • 48k black paper white borderI recently sold a speccy to a guy, unfortunately the power supply didnt survive the trip, so on replacing for him it seems neither did the speccy! H…

    ... most likely to be a RAM fault.

    As it appears ... starting, hence the black paper/screen, that's an indication that ...
    1024MAK 1024MAK April 2014 Hardware
  • 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…

    ... beep momentarily stops and the screen prints a single "?" character, ... copyright message moving up the screen. The machine is unresponsive to ... BASIC commands correctly. However, the screen has duplicate versions of whatever ... not typical of a lower RAM fault.
    Zorn Zorn May 2014 Hardware
  • 48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…

    ... Spectrum has an upper RAM fault that is corrupting the ... generation of the upper RAM CAS and so the ... more of the upper RAM ICs is faulty. You ... />
    If faulty upper RAM is interfering on the data ... through the motions, loading screen is fine and then just ...
    wep855 wep855 August 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... a weird Z80 CPU fault or a weird RAM fault, the only other ... flat part of the silk screen print and the flat side ... curved part of the silk screen print).

    [I][B ...
    1024MAK 1024MAK October 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…

    ... on screen, or keyboard reading issues.

    Given the fault description ... this sounds like an upper RAM fault and that the ULA is ...
    balford balford January 2015 Hardware
  • You get what you pay for-You live and learnDecided to try for a cheap spectrum + on ebay described as not being able to tune it and some keys did not work - haha Duly received and opened up a…

    ... is most likely a lower RAM fault, but if the border colour ... to a very fuzzy copyright screen ( Analogue TV ) but could not ... V

    [B]LOWER RAM[/B]
    O V - 0 ...
    woollymammoth woollymammoth February 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... sensible to remove the upper RAM and concentrate on getting the ... it should with no upper RAM).[/quote]

    I ... RAM and powered up the Spectrum. I get the exact same fault screen ... as I did before. So apparently the upper RAM has ...
    memrah memrah December 2015 Hardware
<1234567…34>

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