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<1234567…34>
  • 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 ... have some new and old RAM ics KM4164B-12 [B]only ... [/B] on ic's 25-32 positions
    how i can identify the faulty RAM ic?
    any tips will be ...
    xaris_sm xaris_sm March 2013 Hardware
  • Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…

    ... 1 spare lower ram, and 1 spare upper ram IC's you would ... -15NL4 (IC17)

    Working IC's pulled from scrap boards ...
    Your Spec-chum Your Spec-chum September 2017 Wanted
  • upgrades what you looking for?i start working for upgrades for ZX, but i'm Atari specialist and i don't know exactly what you need for ZX. On the moment i have DIVIDE in stock, an…

    A ram adapter card to replace faulty ram ic's with some readily available alternative ?
    Cameraman Cameraman April 2009 Hardware
  • upgrades what you looking for?i start working for upgrades for ZX, but i'm Atari specialist and i don't know exactly what you need for ZX. On the moment i have DIVIDE in stock, an…

    [QUOTE=Cameraman;348837]A ram adapter card to replace faulty ram ic's with some ... ;)
    Recently replaced the lower RAM on a Speccy 48K with ...
    RetroTechie RetroTechie April 2009 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... lower RAM (IC13) was not at fault by swapping this IC with ... and suspecting that an upper RAM IC would be the most likely ... PEEK in upper RAM suggested more than one faulty RAM IC. So, I de ... -soldered all the upper RAM and ...
    Zorn Zorn April 2012 Hardware
  • Issue 2 headache!Ive got an issue 2 here that firstly had a blown regulator (fixed), now its reading as a 16k machine (its fully populated), ive replaced and socketed…

    ... original problem was, as suspected, faulty upper RAM.

    Note that ... working address found by the RAM test routine. So, for what ... to try to identify the faulty RAM IC.
    Zorn Zorn August 2012 Hardware
  • Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …

    ... unfamiliar, contended or not ram, pages, data line ... and data adrress,ram banks...

    can i add ram ic's only on positions ic17 ... ic24? that is conteded ram? wich means that ... ram ic?
    is there any way to identify that faulty ram ic ...
    xaris_sm xaris_sm March 2013 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…

    ... /> how i can identify the faulty RAM ic?[/QUOTE]

    The Z80 ... />
    If it is a faulty RAM chip, it is not possible ... routed to all RAM chips. If it is a faulty chip, you ... is possible that IC10 is faulty. IC10 acts as a multiplexer ...
    1024MAK 1024MAK March 2013 Hardware
  • Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…

    ... as is, nothing apart from faulty RAM IC's replaced - nice clear and ...
    balford balford September 2014 Hardware
  • Memory testersHi, Just wondering which software people are using to test the memory in their spectrum. I have been using Zorn's memory tester as described here:…

    ... TC2068, so will have identified faulty RAM IC's based on the assumption ... post up which IC's are being reported as faulty, and I ... can cross reference the bits to the actual RAM IC ...
    balford balford November 2015 Sinclair Miscellaneous
  • 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…

    ... screen? I know sometimes ram chips can be faulty, or the ULA ... has faulty ram IC's. The diagnostic rom will identify which IC is faulty making ... br />
    And regarding the faulty eBay Spectrum. If the seller ... with 1 or more lower ram IC's. But the other way ...
    Your Spec-chum Your Spec-chum August 2019 Hardware
  • Spectrum 128k advice neededHi, I'm new to this forum and the spectrum world. I have this spectrum "toastrack" that was working fine until today. It doesn't boot anymore, it s…

    ... until there were no more faulty RAM IC's. There were 3 total ... faulty RAMs, now the machine boots!!< ...
    gleegum gleegum August 2020 Hardware
  • Spectrum +3 not working [HELP]Hi, When i turn on my zx spectrum +3, im presented with a black screen with a solid green border all around it. Anyone here knows whats the meani…

    ... 1OO% focus on being a ram issue and ill change the ... ;)[/quote]

    Sometimes a faulty ram IC can be hotter to touch ...
    Your Spec-chum Your Spec-chum October 2021 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    Hi, I have a faulty ZX Spectrum Issue 2 motherboard. ... a lower ram failure. I have lightly touched the IC's in ... seem cool.

    The ram fitted is 8322 4116 2N ...
    serene serene June 2013 Hardware
  • ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…

    ... zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have ... />
    While a 32Kx8 SRAM IC can be directly interfaced to ... as the lower RAM replacement and emulates dynamic RAM.

    Here ... you'll have to remove faulty RAM ICs in order to install ...
    Zorn Zorn July 2013 Sales
  • Issue 2 Upper Ram, Loading & ResettingI have a 48k Issue 2 Speccy and for the life of me can't track down what the problem is with it. I initially thought that some of the uppe ram ic's w…

    ... some of the uppe ram ic's were faulty as I wasn' ... on to desoldered the upper ram ic's, socketed the board ... and replaced the ram with known good chips. ... all the upper ram with known good ram from another Issue ... now be the upper ram as I swapped and ...
    retrogamemart retrogamemart December 2014 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…

    ... is a RAM fault but how can I identify the faulty chip ...
    Renegade Renegade July 2017 Hardware
  • ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…

    ... which is probably normal since ram
    test takes ...
    Sinclair ZX 16k ram pack issue 3 .
    ram pack :

    ... still a posibility of faulty RAM somewhere on the lower ... is faulty or not.

    Also when no ram ...
    Tom-Cat Tom-Cat September 2005 Sinclair Miscellaneous
  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …

    ... joints for the bottom-left RAM chips seem to be very ... physically on the board which RAM chip the display attributes is ... on. This all points towards RAM for me - I don't ...
    Muzer Muzer November 2009 Hardware
  • faulty zxspectrum +hi all i just bought a speccy 48k+ off ebay it worked for like 15 mins now it is stuck on the reset screen. I fear this is something major maybe fau…

    ... this is something major maybe faulty ram or the ULA. Does any1 ...
    rustyredline rustyredline November 2009 Hardware
  • Faulty +2 advice please :)Hi all , I have a faulty +2 which when powered up gives a black border and 6 black and White stripes , I'm thinking faulty ram ??? Any one have any b…

    Hi all , I have a faulty +2 which when powered up gives a black border and 6 black and White stripes , I'm thinking faulty ram ??? Any one have any better ideas :)

    CodenameV
    CodenameV CodenameV March 2012 Hardware
  • Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…

    ...
    the manual say that ram ic's should be KM4164B-15P ... repaired by anyone) the ram chips was KM4164B-12
    ram?

    something else, ... 48k issue 2 zx with RAM chips IC 6-13
    ... to remove all the 48k ram chips? it will not ...
    xaris_sm xaris_sm March 2013 Hardware
  • Calling people with Diagboards.....and who have toastracks or grey +2's with all socketed memory :) I'm finishing off modifications to the Diagboard firmware to expand its testing c…

    ... determine when memory is faulty, which specific IC(s) are at fault ... sample output when IC16 (upper RAM) is removed:

    [ ... when IC6 and IC8 (lower RAM) are removed:

    [ ... to screen the specific upper RAM IC locations that have failed.
    balford balford March 2014 Hardware
  • RAM issue for potential 48k buy?Hi guys I've got a 48k in my sight for ?20 but... it has an issue: [QUOTE]"I tested the computer and only displayed a distorted screen. Coloured …

    ... ]

    Would this be faulty RAM chips? I've seen similar ...
    dreamscape dreamscape August 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…

    Bought another faulty spectrum from Ebay.

    ... /> I found I had a faulty Lower RAM IC (IC 6) and replaced that ...
    whoremoan whoremoan January 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…

    ... btw). I desoldered 1 ram ic and tested this in a ... and socketed all lower ram. turned the speccy back ... and reinserted all original lower ram ic's. Speccy is working ... with a few lower ram ic's the 12v line ... look? Why are the ram ic's causing the instability in ...
    patzik patzik April 2016 Hardware
  • 48K Issue 2 Spectrum showing exactly 16KI've acquired an issue 2 and it quickly became clear that only 16K of memory is available. I've read that some early 48K Spectrums with malfunctionin…

    ... malfunctioning upper RAM were sold as 16K versions. All IC slots are ... populated and the upper RAM are all ... disabled? If the lowest upper RAM IC is faulty, can I determine that ...
    LoonyJetman LoonyJetman August 2016 Hardware
  • ZX Spectrum+ showing 16K of RAMHello again, as the title says my ZX Spectrum+ is showing only 16K of RAM instead of 48K when running a memory check. [url="http://www.1000bit.it/su…

    ... + is showing only 16K of RAM instead of 48K when running ... on how to identify the faulty RAM chip, but I seriously have ...
    vale vale July 2017 Hardware
  • Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…

    ... noticed it had lower ram IC's 9 and 11 ... previously replaced lower ram IC's as suspected faulty. I also noticed ... and fitted 2 new lower ram IC's(NEC D416C-2). ... around the upper/lower ram IC's. I know they ... where the previous lower ram IC's were replaced, and ...
    Your Spec-chum Your Spec-chum July 2018 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…

    ... were there two failed ram IC's, but the previous ... removal of IC15 lower ram, with damaged pads/vials ... IC10 to be faulty. I removed the IC, fitted a socket ... Smartcard, and this Speccy passes ram tests.:-

    ... do this if found faulty. I may upgrade to ...
    Your Spec-chum Your Spec-chum August 2019 Hardware
<1234567…34>

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