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Search Again :: Adv Search 1000 results in 0.029s
<1234567…34>
  • 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' ... , writing the decimal value 2 to each one. This ... byte (it should be 2), subtracts one from it ... ought to be 2, as written by the RAM-FILL routine). ... other than telling the RAM to store 2 in all locations.< ...
    Zorn Zorn April 2012 Hardware
  • 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
  • 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 …

    ... to fix up my Issue 2 and have run across ... :

    Spectrum: Issue 2, 48k
    Initial problem: Yellow ... colour issue.
    2. MEMCHK returned 32767, upper RAM fault. UPRAM85 returned 93 ... "black screen and red bars" RAM test appears, after which the ...
    Trafferth Trafferth August 2014 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 ... the upper memory but the fault is still there.
    ... just flicked between the 2 colours with occasional hints ... more likely a lower memory fault? or is my rom ... I order a lower ram set.
    cypher007 cypher007 December 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…

    Got myself a grey +2 but at startup it shows ... also suspect there is a RAM fault but how can I identify ...
    Renegade Renegade July 2017 Hardware
  • 48K Issue 2 RAM issuesI have 48K issue 2 board (I've checked, the upper memory is present!). It's not very well. I've not attempted to diagnose one before, so please bear …

    I have 48K issue 2 board (I've checked, ... with

    bit 2 = IC16 (IC7)
    bit ... 174 = 10101110

    bit 2 = IC16 (IC7) (from 166 result ... are only in the upper RAM as it will actually ... makes me wonder if another fault exists. It has been ...
    kurbeco kurbeco August 2019 Hardware
  • Issue 2 Speccy faultHi Guys, I'm really hoping someone can help me with a fault that has just developed on my issue 2 speccy. After perservering for some time with usi…

    ... can help me with a fault that has just developed on ... my issue 2 speccy.

    After perservering ...
    pasty72 pasty72 December 2010 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…

    ... for supplying me a replacement +2 however it seems to be ... this may be?

    Ram fault? ULA loose. If it requires ...
    zerohour zerohour June 2012 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…

    ... to diagnostic a probably RAM fault on my +2 grey

    i ... have some new and old RAM ics ... i can identify the faulty RAM ic?
    any tips will ...
    xaris_sm xaris_sm March 2013 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…

    ...
    I have an issue 2 spectrum which I'm having ... that this is an upper RAM fault.
    As instructed I ... resistance of pin 2 of the lower RAM and found 1 ... pin 2.
    I replaced the offending upper RAM chip ... 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…

    ... tring to fix an issue 2 board. I was getting the ... there there is a lower ram fault with it i think) I ...
    Firefox11 Firefox11 January 2015 Hardware
  • +2B ram chips?Hi all, I have got 2 Plus2B`s and 1 Plus2 gray case. Ok the one Plus2B don`t work, so I tried to see if I could pin down the problem. I changed the …

    ... />
    There are 4 ram chips on sockets on board ... Plus2B.
    The one ram chip IC6 had a pin ... .
    I then removed 2 ram chips IC6 and IC4 replace ... dwith 2 other ram chips that to be ... />
    If its the ram chips then I shall buy ...
    swift240 swift240 June 2007 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…

    ... to mean a lower RAM fault, ie something in the ... the machine gave the same fault. Due to the fruity ... Interface 2 which has a RAM test, the original fault when ... bit per byte the fault was always located at ... RAM chips contributes a single bit to each byte any fault ...
    Womble Womble August 2010 Hardware
  • 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 ... the chips are marked MM5290-2 and appear to be the ...
    weathereye weathereye February 2011 Hardware
  • Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…

    ... fault in upper RAM causing incorrect instructions to get run.
    2. A fault ... Z80.
    3. Intermittent ULA fault (easily testable - since the ... possibility)
    4. A fault in the ZX84 chip (PCF1306 ... which now functions as a 2.4k resistor) will probably ...
    Winston Winston December 2013 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 …

    ... been working on ZX285 for 2 - 3 days so far. ... never reported finding a RAM fault while testing lower or ... />
    - Occasional display synchronisation fault on entering/editing program lines ... reasonably confident that when the fault occurs, the voltage at ...
    Zorn Zorn February 2016 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 …

    ... . One has a low-16k ram fault for 1 I have no ... idea whats wrong and 2 have broken membrane - but fixable ...
    Tom-Cat Tom-Cat June 2005 Sinclair Miscellaneous
  • 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 …

    ... program that writes to screen RAM every bit pattern, and then ... (!) by one of the upper RAM chips! A quick replacement later ... fix my grey +2 now: I have suspected ram fault (coloured flashing blocks ... must be something wrong with ram.

    What would ...
    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…

    ... all of RAM on boot - bad RAM >perhaps ... ?[/QUOTE]

    I repair a spectrum issue 2 ... that had this symptom. It was a chip of upper RAM ... 74ls157 (In a issue 2 it was IC26 and ... then spectrum has a upper ram fault.

    Bye
    Jose_Leandro Jose_Leandro July 2006 Hardware
  • Spectrum ULAHi new to forum ,and have been a speccy owner/fan since the begining{like most 30 somthins on this forum !) Anyway what i want to know is the ULA th…

    Download the speccy 48K service manual from this very site and have a butchers at the memory testing bit. That'll give you some idea of if it's a ram fault

    Also there were some issue 2 16K machines released.
    BruceNorton BruceNorton July 2007 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…

    ... s most likely a RAM fault since initialisation seems to ... :D

    2) Swop the ULA and see ... hot. Especially the 4116 RAM chips. Change any ... 4) Test upper RAM - sometimes, bad upper RAM just stops working ... work. Sometimes, bad RAM will stop the machine ...
    DEATH DEATH July 2007 Hardware
  • Spectrum +3 suspected memory faultHi, I've been using my +3 for the first time in a while and found that some games have problems with the display becoming corrupted and sometimes cr…

    ... recently desoldered the +3's RAM, put in sockets and tested ... .php?t=31415&highlight=ram+fault[/url]

    reports a ... similar problem on a grey +2, and it's suggested that ... on startup, definitely not the RAM since I've swapped it ...
    JohnH JohnH July 2011 Hardware
  • Dark Screen, non working 48k Spectrum (rubber key)I have an issue 1 (I think) "dead cockroach" 48k Spectrum. On power up I get a dark screen and the machine is unusable - see pics. Any ideas on the…

    ... looks like an early issue 2 Spectrum.

    The display ... when there is a lower RAM fault. Are all the supply voltages ...
    Zorn Zorn May 2012 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…

    ... for supplying me a replacement +2 however it seems to be ... this may be?

    Ram fault? ULA loose. If it requires ...
    gtsamour gtsamour 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…

    ... . My main suspicion is a RAM fault to be honest I really ... forgive my vague description or fault finding info.

    Also ... 1.4A as opposed to 2.1A (+2 one) will this make ...
    zerohour zerohour June 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.
    2 with the same screen it was a (lower) RAM fault. There ... -speaker buzzing was probably the RAM.

    @Zorn: Thanks for ...
    Trafferth Trafferth May 2013 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…

    ... sense than buzzing being a RAM fault. :) I don't have the ... it kinda-like-an-Interface-2-but-not-really and run ...
    Trafferth Trafferth May 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…

    ... php?t=44052"]Testing a +2[/URL][/B]
    [ ... /showthread.php?t=41027"]RAM fault on 48K Spectrum[/URL ... includes a link to a RAM test from Zorn that ... /ramtest2.asm"]Spectrum +2 (not +2A!) RAM test[/URL][/B] ... ramtest2.tap"]Spectrum +2 (not +2A!) RAM test TAP file[/ ...
    1024MAK 1024MAK August 2013 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…

    ... for example a Sinclair Interface 2)? Does a joystick cause ... also possible that a RAM fault is causing the CPU ... in the top part of RAM becoming corrupted.

    RAM in sockets? If yes, ... remove this RAM and try again. If ...
    1024MAK 1024MAK April 2014 Hardware
<1234567…34>

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