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<1…13141516171819…34>
  • 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 ... the case - simple 74xx logic chips with (max) a few hundred ...
    RetroTechie RetroTechie 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 ... the labels remained on those chips. I've added the labels ... back in for the RAM chips. New schematic at the same ...
    guesser guesser October 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…

    ... the RAM chips that I removed becuase they where faulty and replaced ...
    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…

    ... the RAM chips that I removed becuase they where faulty and replaced ...
    RetroTechie RetroTechie November 2010 Hardware
  • 48k or 16K ?Hi All Something I do not recall, how do you tell a 48k rubber key Spectrum from a 16k ? Thanks for reading

    ... you don't have a 48 with dodgy RAM, the 16K ... bad ram or possibly loose chips, as it is meant to ...
    Chris A Chris A December 2010 Hardware
  • 48k or 16K ?Hi All Something I do not recall, how do you tell a 48k rubber key Spectrum from a 16k ? Thanks for reading

    ... bad ram or possibly loose chips, as it is meant to ... 48k machine ?[/QUOTE]

    faulty ram chip(s), as someone ...
    Arda Arda December 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…

    [QUOTE=aowen;497156]Best looking: 48
    Best of the 48K ... involve adding hard to obtain chips... the +3 is best for ...
    guesser guesser December 2010 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…

    ... memory chips shorting. These 4116 chips can still be found and faulty ones ... de-soldering, but finding the faulty memory can be very hit ...
    Macc Macc 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…

    ... non-contended ram chips and IC 24 likely the faulty one. Piggybacking ...
    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)…

    ... 32K chips go. That would make future replacement of a faulty DRAM ... easy, or allow you to quickly test DRAM chips ...
    RetroTechie RetroTechie 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)…

    ... advice. I've transplanted the chips and am just doing some ... computer, I would just have faulty reading and writing to the ...
    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)…

    ... enough that RAM chips which are [I]obviously[/I] faulty, aren't ...
    RetroTechie RetroTechie December 2010 Hardware
  • Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…

    ... ,
    considering replacing 74S04 in faulty 128k(heatsink).
    Here were ... of plain TTL and 74S chips from places like [url]http ...
    guesser guesser January 2011 Hardware
  • Spectrum 48k boots but small black dots start appearingAnyone any ideas where I should look first?

    ... case it was not a faulty part, just bad practice that ... one of the lower memory chips could be suspect. Theoretically...
    Can chips be tested 'in situ' with ...
    roko roko 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 …

    ... , I come across some memory chips, and to know if they ... damaged if I test a faulty 4116 chip on it.
    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 …

    ... , I come across some memory chips, and to know if they ... damaged if I test a faulty 4116 chip on it.
    LCD LCD January 2011 Hardware
  • DivIDE circuit/logic specsIs the hardware of the DivIDE documented, particularly the contents of the GAL/PAL chips? I'm looking to write a VHDL implementation of it. So far I…

    ... french. All this 32 kB roms use compatible 48 basic, but first ... type in low 16kB. If 48 basic is set then work ...
    velesoft velesoft January 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…

    ... are wrong. The speccy 48 is in a number of ... hand.
    No assorted TTL chips, no FPGAs, no Z80s ( ... I had a load of chips on hand that were ... cos thats a ton of chips I certainly couldnt have afforded ... have been better WITHOUT extra chips or second ULA.
    ...
    spodula spodula February 2011 Sinclair Basic
  • Just cleared out the shed....[IMG]http://i21.photobucket.com/albums/b253/chaosmongers/spe.jpg[/IMG] Just found this lot in the shed. I bet I can't find any blimmin' power supp…

    ... , A whole box of Ram chips, and an Eprom programmer. These ... they've always arrived within 48 hours. Everything is collected reliably ...
    chaosmongers chaosmongers February 2011 Sinclair Miscellaneous
  • 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. I ... ROM if that should prove faulty but my recollection is that ...
    weathereye weathereye February 2011 Hardware
  • Zx Spectrum 48k+ black screenHi A friend of mine gave me his 48k+ and when i tried to turn it on I just get a black screen of the TV. I don't have sound of the console. Where c…

    ... replace lower portion of RAM chips
    4. Check and replace ... probably cheaper to buy a 48 spectrum and use the ULA ...
    Zetr0 Zetr0 March 2011 Hardware
  • 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…

    Hi and welcome to WoS.

    I would say that there is a faulty memory chip.

    By heart the ZX Spectrum has 8x 1 bit chip and 1 of those chips might be broken.
    Dr BEEP Dr BEEP 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…

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

    Is there ... if Z80 or ram are faulty with just a multimeter? (I ...
    LuKeJerry LuKeJerry March 2011 Hardware
  • Spectranet updateOK, so I've not written an update here for a while...so here's a quick summary, the gory details are on the Spectranet news page on my wiki. * Hardw…

    ... " the IF1 because of a Faulty M1 signal.

    I ... out that alot of known faulty Z80A chips were used in Issue ...
    mick66 mick66 March 2011 Hardware
  • why is it......my xbox360 has died for the 4th time, so why can I turn on a 20+ year old speccy and still enjoy gaming goodness fecking microsoft, Sinclair could h…

    ... the additional problem of a faulty heat-sink design that didn ... Sony decided to clock their chips 30% slower, then the reliability ...
    takapa takapa March 2011 Chit chat
  • why is it......my xbox360 has died for the 4th time, so why can I turn on a 20+ year old speccy and still enjoy gaming goodness fecking microsoft, Sinclair could h…

    ... the additional problem of a faulty heat-sink design that didn ... Sony decided to clock their chips 30% slower, then the reliability ...
    ewgf ewgf March 2011 Chit chat
  • +2: 128k enhanced games no longer loading (but OK in 48k mode) :-/Having a spot of bother with my +2, a couple of my favourite games are now refusing to work in standard "Tape Loader" based 128k mode - Marauder (Hew…

    Thanks folks, I'll have a crack at programming the memory tester routine over the weekend!

    What happens if one or two banks come up faulty, can the memory chips be swapped out easily?
    greycase greycase March 2011 Sinclair Miscellaneous
  • +2: 128k enhanced games no longer loading (but OK in 48k mode) :-/Having a spot of bother with my +2, a couple of my favourite games are now refusing to work in standard "Tape Loader" based 128k mode - Marauder (Hew…

    ... that they (the memory chips) will need to be ... would be sourcing new memory chips..

    However I ... that remove all the chips in favour of a ... a problem of the memory chips as normally the Spectrum ... crash if one of the chips is faulty.

    I ...
    Speccyman Speccyman March 2011 Sinclair Miscellaneous
  • Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …

    ... next way for modify ZX16/48 to 128kB ram with both ... ZX board (use different dram chips and add next components).
    velesoft velesoft March 2011 Hardware
  • Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …

    ... start ZX to 48 basic, but with enable 128 kB paging = same ...
    velesoft velesoft March 2011 Hardware
<1…13141516171819…34>

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