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Search Again :: Adv Search 1000 results in 0.013s
<1234567…34>
  • 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 the ... evening and noticed that the 'CPU Patch' that should be present ...
    jp jp September 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 the ... evening and noticed that the 'CPU Patch' that should be present ... ...
    [/QUOTE]

    This CPU Path?

    [url]http ...
    Jose_Leandro Jose_Leandro September 2008 Hardware
  • DivIDE with gray +2 LOAD not workingI have 128+2 gray. It has faulty upper memory. PEEK 23733 shows 191. I wanted to use divIDE to load some test programs, but it always hangs when exec…

    ... real signal picture showing
    CPU fault. I can do that, but ...
    kpuchatek kpuchatek July 2010 Hardware
  • Spectrum +3 Help pleaseI bought a +3 from a bootsale today, and when I got it back it didnt work (shock!) However after working out the +5V line on the PSU line was about …

    ...

    (a)ROM fault
    (b)CPU fault

    recently I ... /> Next possible fault I would say is a CPU, you can test ... this with a CPU exchange from another spectrum.
    Zetr0 Zetr0 April 2011 Hardware
  • Spectrum +3 Help pleaseI bought a +3 from a bootsale today, and when I got it back it didnt work (shock!) However after working out the +5V line on the PSU line was about …

    ... /> @Guesser

    indeed, the CPU fault is a long shot my ... would happen... after replacing the CPU with one from a ULA ...
    Zetr0 Zetr0 April 2011 Hardware
  • Very odd problemHmm, loaded up Sanxion on another 48k+ I have here only to find that when it had loaded there were no enemies on screen, furthermore on loading Atic …

    I'll guess that the most likely is a RAM fault, followed by a multiplexer (that interface the RAM to the Z80) fault, then maybe a Z80 CPU fault. I don't think a ULA fault would cause this, but may be wrong.

    [I][B]Mark[/B][/I]
    1024MAK 1024MAK January 2014 Hardware
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... recently explained to be a CPU fault) has gotten worse and now ...
    CornishManicMiner CornishManicMiner March 2014 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…

    ... 3 from the dead today... CPU fault. :)
    Trafferth Trafferth August 2014 Hardware
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... a weird Z80 CPU fault or a weird RAM fault, the only other ... the ULA and the Z80 CPU). Also if you renew it ...
    1024MAK 1024MAK October 2014 Hardware
  • Resurrection of ZX SpectrumHello everyone. I recently emerged from my attic bearing my childrens 128k ZX Spectrum +2 with a bag of games etc. Like many before it hasn't seen…

    ... RAM chip fault, a ROM chip fault or a Z80 CPU fault.
    ... But as the Z80 CPU only has very simple add ... , the next stage of fault finding is to swap the ... faulty one. If the fault does not move with the ...
    Next, if the Z80 CPU is socketed, change this for ...
    1024MAK 1024MAK January 2015 Sinclair Miscellaneous
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... tricky to diagnose upper RAM fault, so I thought I' ... . This usually indicates a fault with the upper RAM or ... was unable to find any fault by testing from BASIC.< ... analyser to the Spectrum's CPU and capturing the time ... I couldn't reveal the fault from BASIC. I can ...
    Zorn Zorn April 2012 Hardware
  • Spectrum +2A/B - CPU affects loading??Hi everybody, Here's something I don't understand. A +2A came in the other day, and it was working fine, but wouldn't load some tapes. OK, thinks I…

    ...
    Tried changing the CPU with one with an iffy ...
    Tried changing the CPU with an NEC D780C as ... alignments. With the good CPU it just worked straight ...
    How can the CPU be affecting the loading this ... your CPU and not your datasette that's at fault!
    Spirantho Spirantho January 2013 Hardware
  • New CPU and Spectranet oddity.I have no reason to suspect this problem is due to a fault/poor design of the Spectranet, but understanding what it does at system initialisation may…

    ... problem is due to a fault/poor design of the ... />
    With the new CPU and Spectranet connected, the Spectrum ... timings of some of the CPU's operations, making it ... the detection of the CPU's ROM access and ... enough. Maybe the new CPU type latches the value on ...
    Zorn Zorn June 2013 Hardware
  • Microdrive fault.I guess some of you may know this... My microdrive has a problem: the motor starts running as soon as I plug the computer in, and won't stop! It is …

    ... is not the interface's fault, as it behaves the same ...
    Alessandro Tommasi Alessandro Tommasi April 2001 Sinclair Miscellaneous
  • Spectrum +3 fault - flashing screen on power onHi ive just bought a +3 When I power it on the power led and disk drive led come on. The screen just flashes black and white around the border, almos…

    ... ideas as to what the fault is?

    ta ...
    mlasham mlasham December 2002 Sinclair Miscellaneous
  • New member, dead SpeccyHallo everyone, I was directed here from a Commodore (boo, hiss) forum after pleas of aid with my newly acquired, quite dead 128k Speccy. I sincerely…

    ... tell if it's a fault in the power supply or ... />
    I've got replacement CPU and memory, but if it ...
    idrougge idrougge December 2004 Sinclair Miscellaneous
  • 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 ... i may have a faulty cpu and i can get only ... known working one and the fault is still there)

    odious odious September 2005 Sinclair Miscellaneous
  • 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
  • Noisy display faultI've been given an Issue 3 48K Speccy PCB which is in good working order except the main display area has slight changes of shade loosely following a…

    ... changes and shifts with varying CPU activity (and matches changes of ...
    Laser Laser 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
  • Black paper, white border. Ram fault?We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working o…

    We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working one, and we got the same result.

    is this a ram fault? How can we check ram chips?
    Arda Arda December 2006 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... only the lower 16KB of CPU's address space. If ... I removed the CPU and ROM chip (which ... my Spectrum and connect the CPU buses of both computers ... RAM in sync with the CPU, which will probably prevent ... they also appear when the CPU is dead)? I would ...
    Avian Avian May 2007 Hardware
  • Spectrum Diagnosis: Purple is not my colour!Hi, I thought the self-fault-finding amongst you might appreciate my learning experience this afternoon in fixing my home-made speccy 48K. Yesterda…

    ... />
    I thought the self-fault-finding amongst you might appreciate ... of the 4 digital boards. CPU/ROM - nothing obvious there. ZX8401 ...
    Phu Phu July 2007 Hardware
  • Unreal Tournament 3Is anyone here looking forward to Unreal Tournament 3 on the PC/XBox 360/PS3? The original Unreal Tournament (1999) is probably my favourite PC game …

    ... , I don't see any fault with the UT 1999 engine ... will have more memory, more CPU speed and far more graphical ... fork out for the necessary CPU/memory/motherboard/GFX card to ...
    ewgf ewgf August 2007 Chit chat
  • What I hate about computers and/or video gamingYesterday I spent approximately four months (subjecively that is, objectively it was around two to three hours) fixing my mate's PC. I won't bore you…

    ... sound and graphics cards, memory, CPU speeds and types, etc?
    fault, but WinXP is supposed to ...
    ewgf ewgf August 2007 Chit chat
  • Dell Dimesion 8300 - Blue Screen of DeathOver the last couple of weeks I have been attempting to fix a Pentium 4 Dell Dimension 8300 belonging to a blind frienrd of mine. I kept getting the…

    ... the memory was not to fault.

    After a bit ... , installing the existing memory and CPU. I am still getting these ... this??

    Is the CPU shot, would that be causing ...
    Scottie_uk Scottie_uk November 2007 Chit chat
  • 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
  • Hardware fault - HELP!I bought a speccy 48K (rubber) on Ebay. I was delighted when it arrived. It was in PRISTINE condition, it looks brand new! However, the machine has a…

    ... ! However, the machine has a fault. The seller has no idea ... that the machine has a fault, so I'm reluctant to ... condition...

    So, the fault? Well, SOME of the keys ... conclude the hardware is at fault. A couple of questions:
    Mark Wills Mark Wills 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
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
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    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
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