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<1…13141516171819…34>
  • Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …

    ... at the time the CPU samples it, the CPU will read a ... , and unless you do a test where you check that writing ...
    Winston Winston April 2013 Hardware
  • Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…

    ... at cycle 14335 but this test indicates 14336:
    ... ]

    Yes, this test counts frame cycles from the ... pulse, not when Z80 CPU acknowledges it (which is ... related thing and not CPU related, it makes sense ... were written from the CPU point of view, but ...
    Patrik Rak Patrik Rak April 2013 Emulators
  • Circumspect - A Spectrum Emulator for learningThis is a project that I have been playing around with for a while. It must be said, I tend to have problems getting things finished where hobbies a…

    ... /trunk/fuse/z80/tests/]good test suite[/url] rather than trying ... the most power, but reducing CPU use cannot be a bad ... [/URL] display) becoming more popular, CPU power consumption will increase in ...
    zub zub April 2013 Emulators
  • Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…

    What says now RAM test program ? It is ok ?
    I guess you are using RGB output for test, so assuming ULA is ok, it has to be something around CPU/Z80. But you may check ROM too.
    kpuchatek kpuchatek April 2013 Hardware
  • Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…

    ... (cpu/rom/pcf/ula)

    another check was to test with ... main ics 25-32 the test program will work

    xaris_sm xaris_sm April 2013 Hardware
  • Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…

    If the RAM test program runs, then the Z80 CPU is okay.
    CPU is doing. For example if ...
    1024MAK 1024MAK April 2013 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…

    ... the 4116 chips, the ULA, CPU and ROM.
    Pierre[/QUOTE ... 'll write a lot of test that you already has done ... in ULA and also in CPU.
    - Check RESET pin in ...
    Jose_Leandro Jose_Leandro April 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…

    ... The first thing is to test all voltages, starting with the ... 100%. You can easily test for a ripple waveform ...

    The ULA, CPU and ROM, I just pop ... My IC tester unfortunately cannot test the 4116 chip, so ... them into my working test Spectrum. I also de ...
    Pierre Pierre May 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…

    ... without an oscilloscope, to test the M1 line on the ... smile:

    Other test gear like a logic probe ... br /> If your suspect Z80 CPU is socketed, and you can ... a very simple Z80 CPU test circuit. Then you can ... that this is a simple test).

    But ...
    1024MAK 1024MAK May 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…

    ... possible, I would use a test ROM first, as you can ... then discover if the CPU or RAM is the problem ...
    1024MAK 1024MAK May 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…

    ... fault. Hmm. At least the CPU and ULA are probably okay ... on your offer of a test ROM at some point, then ...
    Trafferth Trafferth May 2013 Hardware
  • How to test Z80 Code?Hi All, Is there a way to test a block of z80 code (nothing speccy specific in it) with many different inputs? The reason I ask is that I'm writing…

    ... ://code.google.com/p/z80-cpu/"]http://code.google.com/p ... /z80-cpu/[/URL] writing 4 lines of ... />
    The total number of test runs was approx. 2,000 ... ,000 and the whole test took just over 70 mins ...
    Shando Shando June 2013 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... in this situation. When the CPU will try reading the memory ... of those? you can just test it in your favourite emulator :)
    introspec introspec June 2013 Development
  • Issue 4A issuesHi all, I've been trying to get the Issue 4A board that came DOA with the case I purchased for my Frankenspectrum to work. I've recapped and socket…

    ... a magnifying glass. Finally test with a meter on the ... the first things the Z80 CPU does is to set ... to perform a simple RAM test. This causes the centre screen ... screen.
    If the CPU finds some RAM is good ... , the ROM starts the CPU testing the RAM from the ...
    1024MAK 1024MAK June 2013 Hardware
  • Fast Z80Todays Spectrums are fast as hell and few software utilises this. Z80 in ReVerSE runs at 42 MHz, in Speccy2010 at 28 MHz, in Pentagon 2.666 and in N…

    ... of software that uses precise CPU timming to do hires colour ... also Crazy Cars 1/2, Test Drive 2, Super Hang On ...
    Alone Coder Alone Coder June 2013 Development
  • 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…

    ... electrolytic capacitors.

    A test ROM should help to either ... resistance (a low range) to test for shorts between the pins ... .
    You should also test the CPU address lines (A0 to A15 ... ) at the Z80 CPU.

    See also this ...
    1024MAK 1024MAK June 2013 Hardware
  • "Jumping Jack" on Kempston Joystick.Hello. I'm new here, so at start I want to welcome everybody :) I'm totally newbie in ZX Spectrum. But I'm still own Timex without cassete player (I …

    ... it depends of Amiga emulated CPU settings. Under RealSpec in Windows ... can fix it somehow and test tap file later under PC ...
    olesio olesio June 2013 Games
  • 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…

    ... /address lines still, or the CPU or ROM have had it ... isn't happening either the CPU isn't running, it can ... for the suggestions. :) When the test ROM arrives hopefully that will ...
    Trafferth Trafferth July 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…

    ... probably suggest a way to test whether the Z80 is working ... fault.

    If the CPU appears to be doing the ...
    Zorn Zorn July 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…

    ... Spectrum board when a CMOS CPU is used. I've tried ... any change. In a brief test, it seemed to work perfectly ... a 47pF capacitor between the CPU's clock input pin and ...
    Zorn Zorn July 2013 Hardware
  • DivMMC clock bufferI have completed the first DivMMC EnJOY today: [url]http://www.worldofspectrum.org/forums/showthread.php?t=44238[/url] But there is a problem with t…

    ... got a working one to test (a while back while doing ... clock regeneration tests, I did test a toastrack with one of ... also in phase with the CPU clock (the clock signal at ...
    Winston Winston July 2013 Hardware
  • Strange error screen on a friend's 128k +2Hi all, Can anyone help me with this screen? [url]http://imageshack.us/photo/my-images/856/sw1k.jpg/[/url] (it is his own link) My friend wants to…

    ... , an easier test might be to swap the CPU (if it's ...
    balford balford August 2013 Hardware
  • Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…

    ... /> The web page on the test ROM you used talks about ... I/O circuit in the CPU or it being shorted to ... something else, then the CPU wouldn't be able to ... was detected, i.e. the test software determined that a read ...
    Zorn Zorn August 2013 Hardware
  • Do NOT click this link...Unless you want to wave goodbye to your entire day. [url]http://orteil.dashnet.org/cookieclicker/[/url] You have been warned. D.

    I thought it might be a good stress test as well but my CPU is only running at 1% with the odd jump up to 3% so nothing to worry about there. (That's with 50 of everything except time machines (34) and 35 out of 41 upgrades producing 14,693,394 CPS)
    ADJB ADJB August 2013 Chit chat
  • 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…

    ... /Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm"]RAM test program[/URL].

    Or ... know what instructions the Z80 CPU is processing. This is hard ...
    1024MAK 1024MAK August 2013 Hardware
  • Do NOT click this link...Unless you want to wave goodbye to your entire day. [url]http://orteil.dashnet.org/cookieclicker/[/url] You have been warned. D.

    ... a good stress test as well but my CPU is only running ...
    Morkin Morkin August 2013 Chit chat
  • New hardware for Spectrum from ShaosI have some ideas for new ZX-peripherals and quickly designed a prototyping board for experiments: [URL=http://nedocon.com/store/speccy/][IMG]http:/…

    ... set or no, then during CPU access from adress 0 can ... protection is very good for test old interfaces with unknown functionality ...
    velesoft velesoft August 2013 Hardware
  • New hardware for Spectrum from ShaosI have some ideas for new ZX-peripherals and quickly designed a prototyping board for experiments: [URL=http://nedocon.com/store/speccy/][IMG]http:/…

    ... set or no, then during CPU access from adress 0 can ... protection is very good for test old interfaces with unknown functionality ...
    Shaos Shaos August 2013 Hardware
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... ://www.dropbox.com/s/zvijykah7qbnnzw/test.tzx"]TZX[/URL] (Penetrator in ... ), you have lots of free CPU time. At 3000 baud, I ...
    GoingDigital GoingDigital September 2013 Development
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... sd card clock follow the cpu clock, so everything is always ... ]
    I will have to test more toroughly later this week ...
    bverstee bverstee September 2013 Hardware
<1…13141516171819…34>

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