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Search Again :: Adv Search 1000 results in 0.007s
<1234567…34>
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... resistance in them between the CPU and
    ULA. ... at pin 6 of the CPU.

    - Hopeful ... data bus lines at the CPU.

    - 0 ... br /> - A8-A14 at the CPU mostly sit at just under ... or perhaps a
    partially faulty CPU.

    Any ...
    Zorn Zorn November 2011 Hardware
  • nec780 vs z80aHi everyone! Got a 48k issue 2 board with nec780 with a mts2369 at its back.(spider?) Between pin 11 of the cpu and pin 14 of ic 23 theres a resis…

    ... /> Between pin 11 of the cpu and pin 14 of ic ... think i may have a faulty cpu and i can get only ...
    odious odious September 2005 Sinclair Miscellaneous
  • OopsToday is a sad day :confused: Poor old rubber keys has gone t**s up. :( All i get is a black screen with a white border. Any body got any ideas …

    ... (lower 16k), faulty ULA, faulty upper RAM (4532 32k) and faulty CPU.

    faulty ULA.

    don't ...
    GP GP March 2004 Sinclair Miscellaneous
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... are you sure that the CPU is being properly resetted? With ... could be the ROM, the CPU, or the non contended ... corrumpted and hence, the CPU cannot read any valid instruction ... due to a faulty CPU, faulty ROM (most probably), or faulty multiplexers. Non contended ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... rightmost ones (that connect to CPU pins 2 & 38 respectively ... schematic, pin 5 of the CPU is shown as connecting to ... that will rule out a faulty CPU.
    napoleonblownaparte napoleonblownaparte June 2012 Hardware
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... has been caused by a faulty CPU, but I've never seen ...
    Zorn Zorn January 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…

    ... to be due to a faulty CPU; not necessary completely inactive, but ...
    Zorn Zorn May 2013 Hardware
  • Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…

    ... :

    - Faulty CPU
    - Faulty ROM
    - Faulty ULA
    - Faulty upper RAM interfering ... with communications between CPU/ROM/ULA.

    Faulty upper RAM is ...
    Zorn Zorn May 2014 Hardware
  • You get what you pay for-You live and learnDecided to try for a cheap spectrum + on ebay described as not being able to tune it and some keys did not work - haha Duly received and opened up a…

    Is the border colour white? What are the exact voltages measured on the +12v, -5v and +5v rails?

    It is most likely a lower RAM fault, but if the border colour is non-white then it could be a faulty CPU also.

    B
    balford balford February 2015 Hardware
  • You get what you pay for-You live and learnDecided to try for a cheap spectrum + on ebay described as not being able to tune it and some keys did not work - haha Duly received and opened up a…

    ... then it could be a faulty CPU also.

    B[/QUOTE ...
    woollymammoth woollymammoth February 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... RAM IC or possibly a faulty CPU. Without further test equipment, it ...
    Zorn Zorn December 2015 Hardware
  • The "Big Issue" about the ZX 48K rubber key Spectrum . Which Issue is best? There is no easy answer as every 48k rubber keyed Speccy owner will have their own favourite so it will be pretty subjective . But my favourite a…

    ... (A/B/S) had a faulty CPU, if I remember correctly, which ... itself, though, so replacing the CPU with a known good one ...
    Ast_A_Moore Ast_A_Moore April 2017 Hardware
  • What's going on inside this ZX Spectrum? [Newbie]Hello folks Last year I got hold of a ZX Spectrum. At the time it appeared to boot up fine, but more recently when I've tried to boot up I've had…

    ...
    1. One or more faulty upper RAM ICs interfering on ... />
    2. Faulty ULA.

    3. Faulty CPU.

    4 ... . Faulty lower RAM. The most ... .

    5. Faulty ROM (rare, so not very ...
    Zorn Zorn October 2017 Hardware
  • issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…

    ... pcb from ebay with status faulty
    pcb had bad voltages ... *256

    I changed cpu (old one working), also changed ...
    gorski gorski March 2009 Hardware
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... that the ULA from the faulty mbo worked fine in the ... 20k, which should suggest a faulty chip.

    So, I ... the repair guide further, the CPU and the ROM chips are ...
    deckard deckard January 2012 Hardware
  • Faulty Grey Spectrum +2 - help neededI have a faulty spectrum +2. I tested the voltaged inside - all check fine. Well, within some limit, +5 for example is 4.83, but all other voltages a…

    I have a faulty spectrum +2. I tested the ... present.

    I swapped CPU with another BLACK +2 - nothing ... /> So, video out is okay, CPU is okay, voltages are fine ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ...

    I have a faulty Issue 3 motherboard and would ... the 4116 chips, the ULA, CPU and ROM. All are ok ... is also possible that the CPU does not start at all ...
    Pierre Pierre April 2013 Hardware
  • Can a CPU emite microwaves? And other questionsSome CPU/electrical questions for the more technical amongst us: 1. Some time back a bloke I knew, whose PC I used to repair, said that he'd read in…

    Some CPU/electrical questions for the more ... PC magazine that when a CPU reached a certain speed (I ... , does that mean that the CPU is in effect drawing more ... XBox 360 console has a CPU with three 3.2 thread ... enough to supprt a 9GHz CPU?
    ewgf ewgf January 2006 Chit chat
  • Faulty 128KI digged out my Spectrum 128, and it wakes not up. I don't have experience, only with 48K. Maybe someone can give me some hint, clue. It looks like m…

    ... looks like memory (or ULA, CPU, memory control logic) error. Screen ... 't have spare. Can replace CPU, but seems not likely...
    piters piters June 2006 Hardware
  • PC CPU heatsink and fans to cool down Speccy!Ah ha! I've just had an idea! taking apart some scrap PCs I decided to take the CPU heatsink and fan units off and see if I can attach them to the …

    ... I decided to take the CPU heatsink and fan units off ...
    Count Count July 2006 Hardware
  • Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…

    ... /> Anyway - which Z80s had the faulty M1 lines, and what was ...
    Winston Winston April 2007 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... />
    Could it be a faulty RF connector (the big box ... the RF output) or a faulty Ferranti ULA chipset?

    CPU-ZX-Spectrum_W0QQitemZ120137893224QQihZ002QQcategoryZ4193QQrdZ1QQssPageNameZWD1VQQcmdZViewItem[/url]

    Msx2 Msx2 July 2007 Hardware
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... in order to test the faulty one's chips.
    After ... i came up with one faulty one so i put a ...
    gtsamour gtsamour November 2007 Hardware
  • Full throttle CPUHello, I was just wondering: do you experts know if any of the 48K games pushes the Z80 CPU to 100%? I mean, every CPU cycle is used? If so, what's t…

    Hello,
    I was just wondering: do you experts know if any of the 48K games pushes the Z80 CPU to 100%? I mean, every CPU cycle is used?
    If so, what's the game/application?

    B/R,
    Lovespider
    lovespider lovespider December 2007 Sinclair Miscellaneous
  • Faulty M1 LineHello, I've got a new DivIDE but it's not working with my Spectrum 48k+. I've got a sneaking suspicion that it's a faulty M1 line. Is there any way …

    ... suspicion that it's a faulty M1 line. Is there any ...
    garethrichardadams garethrichardadams February 2008 Hardware
  • CPU question about various emulators for and on various machinesRight, you know how nowadays the latest CPUs seem to be dual (or more) core 2.4GHz (or whatever speed) as opposed to, say, single core 5.8GHz? Now I …

    ... or 10GHz, or 50GHz) CPU is impractical, if not impossible ... thickness limitations of the CPU's signal lines, or ... XBox itself has a 700MHz CPU. Fair enough, DOSBox ... DOSBox needs a decent CPU to emulate desirable games ... a P4-1GHz, a 2GHz CPU etc?

    ...
    ewgf ewgf March 2008 Emulators
  • CPU fanI want to buy a new CPU fan. But not sure what to buy can anyone reconmend a good cheap fan :) My cpu is Pentium 4 3.06ghz HT

    I want to buy a new CPU fan. But not sure what to buy can anyone reconmend a good cheap fan :)

    My cpu is Pentium 4 3.06ghz HT
    Countvarg Countvarg May 2008 Chit chat
  • Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…

    ... times it has happened, the CPU is from SGS, not Zilog ...
    mcleod_ideafix mcleod_ideafix June 2008 Hardware
  • Video fault with my spectrum, any ideas?Spectrum not working, CPU still seems to work, as the "BEEP" command still operates if machine is plugged in, however it no longer displays a picture…

    Spectrum not working, CPU still seems to work, as ... have any ideas what maybe faulty?

    Thanks Shomenno
    shomenno shomenno July 2008 Hardware
  • Issue 2 Board - CPU 'Patch'I've been wondering why my issue 2 board has been kicking out this signal when powered up... [IMG]http://www.drumfu.com/ResizedDuffIssue2.jpg[/IMG] …

    ... this is symptomatic of a CPU fault.
    I've had ... evening and noticed that the 'CPU Patch' that should be present ...
    jp jp September 2008 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
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    John Elliott on April 21
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  • Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced![quote]Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced![/quote]<br /> Err, why?<br /> <br /> If you are trying…
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