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  • ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…

    ... post I assume the upper RAM chips aren't socketed? In ... always a prime suspect (especially RAM, sometimes ROM), but could also ... ), or an ULA that's faulty but not completely dead. Let ... 's hope disabling the upper RAM provides some clues...
    RetroTechie RetroTechie July 2010 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…

    ... known is that Sinclair used faulty 64Kbit chips to implement the ... third 16K page, so the RAM test that the ROM performs ... , but the CPU which proved faulty.

    But, above all ... responsible of bit 0 is faulty, the screen displayed is like ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…

    ... there be the possibility of faulty operation because of pressing the ... other systems out of MB ram 0 ! Also BS-DOS and ... always to master system in ram 0 ( can be BS-DOS ...
    velesoft velesoft September 2010 Hardware
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    For this, static RAM is better: it draws less ... not as vulnerable as dynamic RAM. Besides, as he says, all ... find 4116 chips, I use 4164 memories. It's not common ... one or two chips damaged. 4164 chips, on the other hand ...
    mcleod_ideafix mcleod_ideafix September 2010 Sinclair Miscellaneous
  • 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…

    ... i.e. which chip- is faulty).

    Is ... have contains a lower RAM region (16K) which ... bank, and an upper RAM region (32K) which belongs ... /> If the non-contended RAM is damaged, the machine can ...
    If the contended RAM is damaged, the computer hangs ...
    mcleod_ideafix mcleod_ideafix October 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…

    ... order do I replace the Ram IC's

    as ... determine which memory chips are faulty. If you can do the ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... it. You've found the faulty chip. If want to be ... properly, because a faulty RAS/CAS circuit inside the RAM, or the ... the data pins of your faulty memory chip are not floating ... , then, with time, the faulty memory chip might damage your ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... it. You've found the faulty chip. If want to be ... a possible failure mode for RAM chip and/or circuit board ... is enough to declare a RAM chip failure. Since in order ...
    RetroTechie RetroTechie October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... have 48K machine with working RAM. I also loaded Manic Miner ... I'm going to take faulty IC15 out and solder new ...
    lillaolle64 lillaolle64 October 2010 Hardware
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    ... this schematic to spot a faulty memory chip on a +2A ... missed the fact that the RAM was ambiguous and the labels ... labels back in for the RAM chips. New schematic at the ...
    guesser guesser October 2010 Hardware
  • divide deviceHi, This is first my first post,so hello to you all I first Spectrum 48k was a Xmas present way back in 1983,best gift ever. Then I moved on to a C…

    ... and 512KB of battery backed RAM.
    Unfortunately a dirty edge ... + or if the DivIDE+ was faulty. If you want to use ... to dirty edge connector or faulty M1 on Z80 CPU.
    Alien 8 Alien 8 November 2010 Hardware
  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... of the RAM chips that I removed becuase they where faulty and ... this board.


    RAM Replaced:

    [IMG]http ... .com/albums/l426/hedge1970/Spectrum/Ram.jpg[/IMG]

    Image ...
    hedge hedge November 2010 Hardware
  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... of the RAM chips that I removed becuase they where faulty and ...
    RetroTechie RetroTechie November 2010 Hardware
  • 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
  • So frustratingI'd recently socketed the lower 16k only to find the upper 32k also had issues. While removing 4 of the chips I've managed to break two tracks. The c…

    ... much resistance?? I will be joining the legs of the ram chips ... so assume it's important not to have resistance ...
    hedge hedge 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
  • broken 48K, strange screenwell I finally socketed all lower 16K ram chips, (8 of them in a row near corner, not those 4 in two rows) and replaced them with new ones but it did…

    ... manual correctly, each RAM chip should have resistance more than 12K on ...
    orange orange 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
  • 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 …

    ... a while checking voltages and resistance readings etc. with my multimeter ... is obviously another fault somewhere (RAM most probably), but at least ...
    Jimbob-Squarepants Jimbob-Squarepants 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
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HitBox

Word Docs Hits
faulty 2.3K 2.8K
ram 12.6K 21.4K
4164 377 528
resistance 1.5K 1.8K

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