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<1…17181920212223…34>
  • Poll: The best spectrumIm putting this up as weve had quite a lengthy discussion discussing the highs and lows of all spectrum models so heres a poll for personal preferanc…

    ... like rubber keys, no reset, faulty keyboards, no AY8192... but it ... 48k... except better keyboard (still faulty, though).
    128k: Good ... compatibility, good keyboard but still faulty.
    +2A/B: Not ... model. Since there's no RAM connected in the top 32K ...
    chev chev December 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... fault in the non-contended ram bank. of my +2 grey ... 24 likely the faulty one. Piggybacking a good ram chip over IC ...
    john58 john58 December 2010 Hardware
  • Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…

    ... just have faulty reading and writing to the upper ram.

    wozname wozname December 2010 Hardware
  • Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…

    ... well the ROM tests the RAM when it boots.[/QUOTE]
    RAM chips which are [I]obviously[/I] faulty, aren't ... for starters. There are some RAM test programs in the archive ... hold off or the static ram IC.[/QUOTE]
    64Kx1 DRAMs ...
    RetroTechie RetroTechie December 2010 Hardware
  • Official CSSCGC 2010 Competition ThreadDear Wossers, As 'loser' of the 2009 competition, I am now obliged to host the 2010 competition. I have created a site which will provide a hub for …

    ... a few bytes of upper ram, but still!"

    It ... myself instead of the massively faulty
    one that was doing ...
    Joe the Iceman Joe the Iceman January 2011 Games
  • Official CSSCGC 2010 Competition ThreadDear Wossers, As 'loser' of the 2009 competition, I am now obliged to host the 2010 competition. I have created a site which will provide a hub for …

    ... a few bytes of upper ram, but still!"

    It ... myself instead of the massively faulty
    one that was doing ...
    BloodBaz BloodBaz January 2011 Games
  • Testing 4116 and 4164 chipsI have a stash of old 4116 and 4164 chips and wondered how best to test them to see if they work. I don't have a working spectrum to plug them into …

    ... ;506758]funny, they are dynamic ram, so latching data will be ... and boot it with the RAM I want to test.
    faulty 4116 chip on it.
    RAM) and use it as a ...
    mcleod_ideafix mcleod_ideafix January 2011 Hardware
  • Testing 4116 and 4164 chipsI have a stash of old 4116 and 4164 chips and wondered how best to test them to see if they work. I don't have a working spectrum to plug them into …

    are 4164 'upper' RAM chips? if so, I'd be interested in buying few of them.
    orange orange January 2011 Hardware
  • Testing 4116 and 4164 chipsI have a stash of old 4116 and 4164 chips and wondered how best to test them to see if they work. I don't have a working spectrum to plug them into …

    ... and boot it with the RAM I want to test.
    faulty 4116 chip on it.
    RAM) and use it as a ...
    LCD LCD January 2011 Hardware
  • Fully integrated ZX+Hi, I just want to show some inspiration for integration HW to ZX+ case ;-) - ZX48 issue 3 board, without all parts regarding video generating (pa…

    RAM is changed to 4164, first plan was replace it ... model with kmouse and bigger ram ... :-)

    Machine is needs ...
    willcz willcz February 2011 Hardware
  • Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…

    ... whole batch of the 14000 faulty Spectrums was called back because ... there were reports of many faulty Spectrums although I have to ... was fine. I did have RAM pack wobble on my ZX81 ...
    Paddy Coleman Paddy Coleman February 2011 Sinclair Basic
  • zx spectrum 48k loading issue (memory problem i think)Hi I have a 48k spectrum that until yesterday was working flawlessly. The spectrum seems to work fine but the problem is with loading games.All the …

    [QUOTE]Isn't all above 16384 in upper RAM then ?[/QUOTE]

    It is. Unfortunately it can be also bad data line. Check PCB, as I remember 3b has soldered DRAM. Otherwise you could just put 4164 chip in socket.
    kpuchatek kpuchatek February 2011 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…

    ... .

    Certainly two (main) RAM chips are getting very hot ... ROM if that should prove faulty but my recollection is that ...
    weathereye weathereye February 2011 Hardware
  • Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…

    ... -6 8401
    16k Ram - 8408
    32k RAM - 8401
    Modulator ... -6 8343
    16k RAM - 8343
    32k Ram - 8345
    Modulator ... which was, and still is faulty. This one had the fuzzy ... 6C001E-7
    16k RAM - 8422
    32k RAM - 8419
    Modulator ...
    Jimbob-Squarepants Jimbob-Squarepants February 2011 Sinclair Miscellaneous
  • New To Group....Hi All, A quick introduction as this is my first post. I am a Scarborough, UK based chap who is quite heavily into retro computing, more specificall…

    I would doubt a faulty memory chip, the machine would ... unusual for a RAM chip to only be faulty within the pixel ...
    Winston Winston March 2011 Hardware
  • Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…

    ... to broken Z80 and some ram-chips 4116.

    Is ... to check if Z80 or ram are faulty with just a multimeter ...
    LuKeJerry LuKeJerry March 2011 Hardware
  • Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…

    ... the easier fix. Found several 4164 100 ns very cheap!!!
    * Rip of Video RAM 4116 and put 4164 doin? robotron-2084 fix ...
    * Rip of Upper RAM and ...
    Mobutu Mobutu April 2011 Hardware
  • Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…

    ...
    4116 DRAMs changed by 4164...bye, bye +12 and -5 ... ]

    a couple 4164 drams faulty...but replaced:

    [IMG ...
    Mobutu Mobutu May 2011 Hardware
  • Sinclair QL-Black and white lines displayCould be obtaining an QL soon,problem is according to seller it display black and white lines on screen,looking at service manual here- [url]http://w…

    ... EPROM to detect which RAM chip was faulty.

    Bye
    Jose_Leandro Jose_Leandro May 2011 Hardware
  • 48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…

    If you see @ message, try to locate video ram faulty.
    Mobutu Mobutu May 2011 Hardware
  • Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…

    ... up, the lower RAM (4116 memory) can become faulty, the TMS-4116 ...
    Winston Winston June 2011 Hardware
  • Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…

    ... up, the lower RAM (4116 memory) can become faulty, the TMS-4116 ...
    Muzer Muzer June 2011 Hardware
  • Rom Cartridge - How does it work?So I've got me an IF2 and it has this ROM cartridge slot. How does it work? I read Paul Farrows site but one question remains unanswered. If I have o…

    it replaces the lower ram, or part of it.. thats ... to find if you have faulty lower ram 4116(?) chips.. as it ...
    fog fog June 2011 Hardware
  • Rom Cartridge - How does it work?So I've got me an IF2 and it has this ROM cartridge slot. How does it work? I read Paul Farrows site but one question remains unanswered. If I have o…

    ... ;546421]it replaces the lower ram, or part of it.. thats ... to find if you have faulty lower ram 4116(?) chips.. as it ... , so it cannot replace lower RAM, only lower ROM.
    Question ... happen if you replace lower RAM (screen) with ROM?
    LCD LCD June 2011 Hardware
  • ZX Spectrum + alive thanks to this site.I was given a dead unit several months ago. I finally had time to look at it yesterday. Using the repair guide on this site the thing is now alive.…

    ... upper RAM fault, the table on that page correctly identified the faulty ... chip. I had only one faulty chip, but ... .

    What type of RAM chips are on your board ...
    JohnH JohnH August 2011 Hardware
  • 48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…

    ... and becouse of second video RAM it still gives possibility to ... I recived with damaged low RAM and many other problems. Now ... to ULA), installed 16 new 4164 RAM chips from one series, removed ...
    podly podly August 2011 Hardware
  • Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…

    ULA is in the socket - easy to put in working Spectrum and check. But I agree - it is seldom faulty. Memory quite often,
    now I have 128k+2B with all RAM dead, nothing more.
    kpuchatek kpuchatek September 2011 Hardware
  • Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…

    ... replacing the rare and expensive 4164 with more common 41256 pulled ... I repaired one of my faulty +2, which works now fine ...
    LCD LCD September 2011 Hardware
  • Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…

    ... know, can take the 4116 RAM with it when it goes ... chip with a less vulnerable 4164. They are *almost* pin compatible ...
    mcleod_ideafix mcleod_ideafix October 2011 Hardware
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    ... that all 8 upper ram chips are caboosed?[/QUOTE]< ... single bit failure (1 bad RAM chip) is enough.
    ... out [I]which[/I] RAM chip(s) are bad. ... DRAM chips, usually indicated as 4164 type (or equivalent).
    ... to replace the upper RAM with a single 32K x ...
    RetroTechie RetroTechie October 2011 Hardware
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  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21

HitBox

Word Docs Hits
faulty 2.3K 2.8K
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4164 377 528

Related Threads

  • 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 …
  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code:<br /> <br /> [CODE]<br /> ;; ram-check<br /> L11DA: LD H,D ; Transfer the top value to the HL registe…
  • Febuary offer - 4164 ram chips: 10pcs ?9, 20pcs ?16Special febuary offer: <br /> <br /> [B]10x 4164 chips[/B]: normally 12 GBP, now for [B]only 9 GBP (11 EUR)[/B] + postage.<br /> [B]20x 4164 chips[/B…
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  • Repalce 4164 RAM by 41464Dear all,<br /> <br /> I have some amount of 41464 DRAM from old PC VGA card which are useless at the moment. I think to keep them as a spare for the…
  • Free Faulty Original Sinclair ZX81 16k Ram expansionI bought this on ebay, was found to be faulty, when plugged in the screen froze and the "K" vanished. <br /> <br /> Thanks to a forum member I now h…
  • How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement.<br /> Know what I found? My old ZX Spectrum.... Those were the days!<…
  • Faulty Keyboard membraneHello,<br /> <br /> My keyboard membrane of the 48K doesn'nt work anymore,<br /> Does anybody know how to get a new one ?<br /> <br /> Thanks,<br /> …
  • just got three 'faulty' speccys...off of eBay - and found they all work :)<br /> <br /> I was geared up with schematics and soldering irons as well, half hoping to have to get the 'sc…

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