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Search Again :: Adv Search 1000 results in 0.083s
<1234567…34>
  • 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…

    ... ),0 then NMOS CPU write value 0 to port BC, but CMOS CPU send ... /128k/+2/+2a/+3 used NMOS or CMOS versions of Z80?
    introspec introspec August 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…

    ... /128k/+2/+2a/+3 used NMOS or CMOS versions of Z80?[/QUOTE]
    NMOS Z80 CPU chips. The 48k, 48k ...
    1024MAK 1024MAK August 2013 Hardware
  • Is it possible to make the Z80 execute a bizarre instruction?What happens when it gets an unrecognised instruction OP Code, I mean something following a #ED that isn't one of the undocumented instructions eithe…

    ... I am aware, the Z80 (NMOS or CMOS version) will execute an instruction ... with normal execution. How useful or not the executed instruction is ... the Z80. So no overheating or burn out.

    ... see comments like “exercise the CPU”. But it makes no difference ...
    1024MAK 1024MAK March 2022 Development
  • IXL and IXHI don't know much about undocumented instructions but I get the impression that [b]LD A,IXH[/b] or [b]LD A,IXL[/b] (B, C, D, E also fine, HL not) are…

    The Z180 needs less clock cycles to execute some instructions, so is faster than a NMOS or CMOS Z80, but that's all I know.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK August 2016 Development
  • Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …

    ... a RAM fault while testing lower or upper RAM.
    ... it with a new CMOS Z80 and confirmed its ... I changed the CPU for an old NMOS one, but one ... described whenever the Spectranet or DivIDE were connected (even ... cases other than when a CMOS Z80 is fitted.
    ...
    Zorn Zorn February 2016 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…

    ... Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 would you ... CPU is faulty, go for a CMOS CPU (brand not important, but Zilog CMOS ... I myself would try a CMOS CPU. If when tested, there is ... try to find a NMOS 4MHz or 6MHz CPU. Again, any brand ...
    1024MAK 1024MAK April 2013 Hardware
  • A FAQ from a Z80 datasheet may reveal some up-to-now unknown behavioursA fellow member of the zonadepruebas.com forum has just mailed this PDF to me. [url]http://www.atc.us.es/~rodriguj/zilog_z80_faq.zip[/url] It's an e…

    ... /> Q. I've heard the CPU is a static device. Can ... . It's different for NMOS and CMOS.
    NMOS: No, it violates the ... they were Genuine Zilog or a second source NMOS - I do have ... differently to on the Zilog or NEC NMOS Z80s)
    Winston Winston October 2013 Hardware
  • SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…

    ... lines vis-a-vis CMOS vs NMOS Z80 chip.[/QUOTE]< ... whether it's a CMOS or NMOS Z80, and have suitable ... for a change in CPU type if they're ... , even between the NMOS Z80 and CMOS Z80B, but I ... layout change between even NMOS and CMOS Z80As, or NMOS Z80 and Z80As?
    zub zub April 2014 Emulators
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... the FPGA to replicate ULA, CPU, ROM, RAM and a ... onto one ULA chip (or in the zx80's case ... because the particular gates or layout used to implement ... a significant revision from NMOS to CMOS yet we call both ... PCB to connect parts, or soldering wires to TTL parts ...
    Alcoholics Anonymous Alcoholics Anonymous November 2014 Hardware
  • Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…

    ... the Harlequin128k fails to load or crashes after starting the ... and again press "D" or you can try to start ... only one having tis problems or not. I also like ... brand and what type of CPU you use. The only ... use a NMOS CPU and 128k SRAMs from BSI. Using CMOS CPU the ...
    ingo ingo November 2016 Hardware
  • Harlequin 128K minor problems.....Hi All, I've just assembled my Harlequin 128K kit, I had initial problems with it that I traced to not having soldered all of the pins on a couple…

    ... Harlequin128 on a different TV or monitor?
    Could you check ... was using a NMOS CPU. With 6MHz type CMOS I had some problems ... using divIDE interface while 4MHz CMOS CPU worked better.

    I ... RGB on a RGB monitor or to inspect the R, G ...
    ingo ingo March 2017 Hardware
  • Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…

    ... that can work out which NMOS CPU it is running on.
    CPU is an NMOS or a CMOS chip though (one ... "undocumented" instruction works differently). But the CPU ... that you have is an NMOS type. So ...
    1024MAK 1024MAK November 2017 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 …

    ... for one reason or another, a 5GHz (or 10GHz, or 50GHz) CPU is impractical ... , if not impossible (because of heat or ... radiation or ...
    ewgf ewgf March 2008 Emulators
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... it have problems generating sound or changing the colour of the ... reads and supplies to the CPU.

    I thought ... the Z80 and the CPU can't read or write to it ... for D0-D4 of the CPU's data bus. With the ... couple of 74-series TTL or CMOS if you don't have ...
    Winston Winston October 2010 Hardware
  • A FAQ from a Z80 datasheet may reveal some up-to-now unknown behavioursA fellow member of the zonadepruebas.com forum has just mailed this PDF to me. [url]http://www.atc.us.es/~rodriguj/zilog_z80_faq.zip[/url] It's an e…

    ... on a NMOS o CMOS chip?
    - Does the Z80 CMOS suffers from ... ?)
    - What happens if a NMOS Z80 suffers a negative spike ... during a LD A,I or LD A,R instructions? (this ...
    mcleod_ideafix mcleod_ideafix October 2013 Hardware
  • Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…

    ... , everything is NMOS or TTL. My board is all CMOS which uses a ...
    Winston Winston March 2007 Sinclair Miscellaneous
  • NEC CPU - problem?I wonder if I should substitute a NEC CPU in a grey +2. Does anyone else had problems with NEC CPUs inside ZX Spectrum. Some time ago I had a Spectr…

    ... that has specs for both Nmos and Cmos parts, and look for ... section.

    For Nmos Z80, these are both specified ... have any NEC / Toshiba / Sharp or other Z80 manufacturer's databook ... Indeed, I've "hand clocked" NMOS Z80s (clock cycles lasting seconds ...
    RetroTechie RetroTechie February 2009 Hardware
  • NEC CPU - problem?I wonder if I should substitute a NEC CPU in a grey +2. Does anyone else had problems with NEC CPUs inside ZX Spectrum. Some time ago I had a Spectr…

    ... that has specs for both Nmos and Cmos parts, and look for ... did you observe in an NMOS Z80 when it was clocked ... below 250kHz? Usually with a CPU with a given minimum clock ...
    Winston Winston February 2009 Hardware
  • computer wisdom neededany ideas? my computers dying, yesterday my computer developed a fault whereby itd keep freezing up, it did it on my XP and ME partitions and even o…

    clearing the CMOS is not quite the same ... sign of a failing PSU or faulty RAM. although freezing i ... the PSU voltage rates and/or the CPU temp as well.
    freddyhard freddyhard June 2009 Chit chat
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... the Z80s in Spectrums are NMOS not CMOS. (It's too easy ... rail-to-rail swings of CMOS outputs...)

    I've ... , so about 4.4 volts or thereabouts which should mean the ...
    Winston Winston September 2010 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…

    It would be best if you can get hold of a Zilog Z80, there are some timing issues with the NEC cpus. Also dont get CMOS cpu as there are some difference in those too, compared to the NMOS ones.
    Johan1973 Johan1973 June 2012 Hardware
  • T-States?Can anyone point me to any good reading (or summarise) that will explain exactly what a tstate is? At the moment for me, tstates are a useful gauge …

    ... to occur and since all cpu actions are made up of ... has occurred (the transition from NMOS to CMOS in the '70s, a ...
    Alcoholics Anonymous Alcoholics Anonymous July 2012 Development
  • Computer repair questionAn ewgf-style post: I'm usually able to find my way around things, search online for solutions and a few other things, but this time I'm unsure of w…

    ... tested for longer. The CPU may well increase further ... place where you're testing it, or has bad ventilation ... machine has had its CPU fan replaced already. That ... itself suggests a previous CPU overheating issue to me. ... wondering if the present CPU cooler is (a) ...
    Marko Marko August 2012 Chit chat
  • Z80 new old stockHi. I found this on eBay but ... is there a way we could know they don't hav a faulty M1 line? [url]http://www.ebay.com/itm/Zilog-Z80-CPU-Z0840004PS…

    ... hand if that's true or not. IMHO, as ... push components to their limits... (or beyond :D )

    NMOS and CMOS Z80's behave different ... can still buy Zilog CMOS Z80's brand new, ... this thread is usually NMOS - Zilog or other brand).
    RetroTechie RetroTechie October 2012 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…

    ... ]

    Yes, Zilog Z80 NMOS CPU have often problem with M1 ... as I know Zilog Z80 CMOS CPU don't have bad M1
    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…

    [QUOTE=velesoft;691696]Yes, Zilog Z80 NMOS CPU have often problem with M1 line. But as I know Zilog Z80 CMOS CPU don't have bad M1[/QUOTE]

    Is there any way to distinguish among NMOS and CMOS Z80?
    TK90XFan TK90XFan 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…

    ... any way to distinguish among NMOS and CMOS Z80?[/QUOTE]

    NMOS CPU write value 0 to port BC, but CMOS CPU send ... border, then your ZX use NMOS CPU, white border sign CMOS CPU.
    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…

    ... ),0 then NMOS CPU write value 0 to port BC, but CMOS CPU send ... , then your ZX use NMOS CPU, white border sign CMOS CPU.[/QUOTE]

    Zup Zup 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…

    ... ),0 then NMOS CPU write value 0 to port BC, but CMOS CPU send ... , then your ZX use NMOS CPU, white border sign CMOS CPU.[/QUOTE]

    NMOS from Zilog) and Z84C00AB6 (CMOS form ST). Things ...
    TK90XFan TK90XFan April 2013 Hardware
<1234567…34>

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