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Search Again :: Adv Search 1000 results in 0.016s
<1…11121314151617…34>
  • 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…

    Well, a new (Zilog) z80 didn't do it, even ... showed the old one as faulty so I'm officialy crying ...
    napoleonblownaparte napoleonblownaparte June 2012 Hardware
  • 16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …

    Have you tried loading a 16K .tap file - if the .z80 causes an unresponsive keyboard, I wonder if it might be a faulty ram chip somewhere....
    rwap rwap August 2012 Hardware
  • Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …

    ... bus or the Z80 I/O system that is faulty as such ...
    1024MAK 1024MAK August 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... diagnostic that says A0 is faulty. I quite frankly cannot understand ... components connected to A0: the Z80, the gate array, the ROM ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • Half dead divIDE helpHi. My divIDE boots up fine but nothing comes up when I press its NMI button. The button was tested and is ok. Any advice?

    ... ) The Z80 chip on the Spectrum may have a faulty M1 line ... - in which case you need to replace the Z80 ...
    rwap rwap October 2012 Hardware
  • Half dead divIDE helpHi. My divIDE boots up fine but nothing comes up when I press its NMI button. The button was tested and is ok. Any advice?

    ... ) The Z80 chip on the Spectrum may have a faulty M1 line ... - in which case you need to replace the Z80 ... it failed. I replaced the Z80 with some others known to ...
    pkersey pkersey October 2012 Hardware
  • ZX Spectrum + 2 128K - Video Issue?Hi All, I have just picked up a secondhand +2 and am having a problem with it. :( When I power the unit on and hook it up to my TV with the RF cable…

    ... supply section is faulty, or the Z80 CPU is faulty. Both are fixable ... . Less likely, is a faulty ...
    1024MAK 1024MAK November 2012 Hardware
  • ZX Spectrum + 2 128K - Video Issue?Hi All, I have just picked up a secondhand +2 and am having a problem with it. :( When I power the unit on and hook it up to my TV with the RF cable…

    ... supply section is faulty, or the Z80 CPU is faulty. Both are fixable ... . Less likely, is a faulty ...
    Drbabbers Drbabbers November 2012 Hardware
  • A new site for an old projectThe 'Interface 1bis' project site has been moved to: [url]https://sites.google.com/site/interface1bis/[/url] In fact, it's not only a simple relocati…

    ... function also with Z80 CPUs that have a faulty /M1 line. It ...
    Dan Antohi Dan Antohi January 2013 Announcements
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... ]

    You have a faulty Z80 cpu (M1 line), replace it ...
    gtsamour gtsamour January 2013 Hardware
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... =gtsamour;678208]You have a faulty Z80 cpu (M1 line), replace it ...
    bverstee bverstee January 2013 Hardware
  • Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …

    ... bit computers are due to faulty RAM chips.
    [URL="http ... ? and which of the two z80 that i have?
    i ... show with all chips on (z80 native is on board i ... ram chips on the working z80 from 48k/NEC D780C-1 ...
    xaris_sm xaris_sm March 2013 Hardware
  • Dataline check on Spectrum 128k +2 greyhi all according with this [url]http://tcg.speccy.cz/zoom/pics/plus2sch.png[/url] R22 pin goes to A14 wich is pin 43 of ULA and pin 4 of Z80 bu…

    ... connection from Z80 A14 to ULA A14. Z80 A14 is ... IC7.

    The Z80 originates the A14 signal so ... the way back to the Z80.

    R22 ... therefore connects between the Z80 A14 and AY-3-8921 ... not the broblem with my faulty +2

    in ...
    xaris_sm xaris_sm March 2013 Hardware
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    ... identify the faulty RAM ic?[/QUOTE]

    The Z80 CPU is ... the "A0" line between the Z80 CPU (IC9) and IC10 ( ...
    If it is a faulty RAM chip, it is not ... chips. If it is a faulty chip, you will have ... is possible that IC10 is faulty. IC10 acts as a ...
    1024MAK 1024MAK March 2013 Hardware
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    ... the "A0" line between the Z80 CPU (IC9) and the ROM ... the "A0" line between the Z80 CPU (IC9) and IC10 (Amstrad ... chips. If it is a faulty chip, you will have to ...
    xaris_sm xaris_sm March 2013 Hardware
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    [QUOTE=1024MAK;690972]The Z80 CPU is a 8 bit ... the "A0" line between the Z80 CPU (IC9) and the ... the "A0" line between the Z80 CPU (IC9) and IC10 ( ... is possible that IC10 is faulty. IC10 acts as a multiplexer ... he removed and found the faulty line? he said the ...
    xaris_sm xaris_sm March 2013 Hardware
  • The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…

    ... another thread I read about faulty M1 signals, which affects the ... they said that NEC branded Z80's have the "strongest" M1 ...
    mcleod_ideafix mcleod_ideafix April 2013 Hardware
  • The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…

    ... another thread I read about faulty M1 signals, which affects the ... they said that NEC branded Z80's have the "strongest" M1 ... .[/QUOTE]

    Yes, Zilog Z80 NMOS CPU have often problem ... . But as I know Zilog Z80 CMOS CPU don't have ...
    velesoft velesoft April 2013 Hardware
  • The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…

    ... ;691573]What's the best Z80 for Spectrums?

    I ... technologies (CMOS, NMOS), so what Z80 would you recommend for Spectrums ... />
    If the CPU is faulty, go for a CMOS CPU ... not important, but Zilog CMOS Z80's are still made, so ...
    1024MAK 1024MAK April 2013 Hardware
  • The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…

    ... ;691866]If the CPU is faulty, go for a CMOS CPU ... not important, but Zilog CMOS Z80's are still made, so ...
    RobeeeJay RobeeeJay April 2013 Hardware
  • +2 Grey NMI problemMy shonky old +2 has always worked very well until recently, ive found that hitting the nmi button on my multiface will either do one of three things…

    ... an external M1 line). A faulty Z80 may appear in any kind ...
    Zup Zup May 2013 Hardware
  • Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…

    ... I have heard of a Z80 failure. I know some members ... I have never experienced a faulty Z80 CPU in the ZX Spectrum ... chips. Occasionally I find a faulty ULA, but that is not ... norm. I have also experienced faulty driver transistors in the video ...
    Pierre Pierre May 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... mind that it is the Z80, the ULA, the ROM ... fault that stops the Z80 after it has got ...
    What we know:
    Z80 okay :)
    Not a ULA ... /> Problem with socket for Z80 or ULA?
    Problem ... solder joint, solder splash, faulty component or track damage on ...
    1024MAK 1024MAK June 2013 Hardware
  • Issue 2 black paper white borderGot an issue 2 here that has a 6c001e ULA, no cockroach, no transistor mod (although you can clearly see on the top of the z80 and on some legs, some…

    ... (in the middle beneath the Z80) is where one leg of ... ROM tester will signal a faulty data line 2 then. If ...
    roko roko July 2013 Hardware
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    ... to know what instructions the Z80 CPU is processing. This is ... . If the system is faulty, the Z80 may be processing random instructions ...
    1024MAK 1024MAK August 2013 Hardware
  • +3 with dead expansion portI bought a +3 from a WoS user. So far, the computer works as expected, but when an interface (e.g. DivIDE (configured correctly) or Multiface3) is co…

    ... classic case of a Z80 with a faulty M1 line. Had a ...
    Falco-F8L Falco-F8L November 2013 Hardware
  • +3 with dead expansion portI bought a +3 from a WoS user. So far, the computer works as expected, but when an interface (e.g. DivIDE (configured correctly) or Multiface3) is co…

    ... daring?[/QUOTE]

    Any Z80 would do the work.
    faulty..
    Zup Zup November 2013 Hardware
  • +3 with dead expansion portI bought a +3 from a WoS user. So far, the computer works as expected, but when an interface (e.g. DivIDE (configured correctly) or Multiface3) is co…

    [QUOTE=Zup;735739]Any Z80 would do the work.
    < ... fails your RAM is surely faulty..[/QUOTE]

    Just be ...
    The_Bert The_Bert November 2013 Hardware
  • Tricky ZX RepairHello guys, This time I put my hands on a very nice Issue 3 16K, upgraded to 48K. To bertter explain "nice", it is absolutely mint, not a scratch on…

    ... ;738002]I think if the Z80 were at fault, you wouldn ... , better, I thought that the Z80 could read correctly (which explains ... this evening and look for faulty lines.
    Falco-F8L Falco-F8L December 2013 Hardware
  • Issue 3B suddenly goes black and whiteAnother 3B I have here had a faulty ULA, swapped that out for another and hurrah! Works! New keyboard membrane and composite mod later I load a game…

    ... , do the same for the Z80 CPU and the ROM just ... the 74LS157 multiplexer that is faulty (my guess).

    By ...
    1024MAK 1024MAK February 2014 Hardware
<1…11121314151617…34>

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