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  • 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…

    ... You can also identify the CPU at startup and use alternate ... I'd guess you could test for MPY with $ED4C, $ ... /> If the NEG/MPY test is a NEG, that probably ... some other cpu.
    Then you could test IXL and ... You almost have to test every feature you want to ...
    JamesD JamesD September 2016 Development
  • Magenta border and black screenGot my hands on a issue 3 48k machine. Did the initial resistance checks and everything seemed in order buy when I switch the machine on all I get is…

    ... it does a very simple test to work out how much ... the ULA (from the Z80 CPU).

    Does this board ...
    1024MAK 1024MAK September 2016 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…

    ... an divIDE57c could you please test to run the program Boovie2 ... brand and what type of CPU you use. The only ... is to use a NMOS CPU and 128k SRAMs from ... BSI. Using CMOS CPU the divIDE is very instable ... cases.
    An 128k Test-ROM I used found no ...
    ingo ingo November 2016 Hardware
  • New Game: SNAKE ESCAPE[b]SNAKE ESCAPE[/b] is a brand new game for the ZX-Spectrum! [img]http://i68.tinypic.com/9sqdj8.png[/img] [img]http://i65.tinypic.com/65odna.png[…

    ... couple more songs, and re-test the first few levels. Everything ... frames it uses too much CPU, thus not leaving enough time ...
    Einar Saukas Einar Saukas November 2016 Brand new software
  • Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…

    ... cycle refresh from the Z80 CPU. Even though they are 128 ... back in. The run the test program again.

    My ... refresh system in the Z80 CPU is defective. That would explain ... , buy a new CMOS Z80 CPU and try again.

    1024MAK 1024MAK December 2016 Hardware
  • help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…

    ... most importantly, some for the CPU "machine" stack. This is where ... .cgi?regexp=^Multiface+1+RAM+Test$&pub=^Flavio+M%2e ...
    1024MAK 1024MAK January 2017 Hardware
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    Can you try a ULA test (hold down U on startup) ... /> Not likely to be the CPU if the diagnostics otherwise work ...
    balford balford January 2017 Hardware
  • Testing your codeOk, guys, again I here with question. How do you test your works? I understand how to test functions and procedures mathematically (for example, g…

    ... under test through a simulator which can be initialized with cpu ... then queried for cpu state after the test program has run ... subroutines under test can be verified by looking at cpu state only ... extract only the subroutines under test from your project as ...
    Alcoholics Anonymous Alcoholics Anonymous January 2017 Development
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... 's a snapshot of a test I made while I was ... at 10Mhz even when the cpu is clocked. They can be ...
    Trantor Trantor January 2017 Hardware
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    The CPU clock looks like this, I' ... [/img][/url]

    The CPU /WAIT line is constant high ... it going into the ULA test:
    https://youtu.be/zub7r8N2D2g ...
    Jet5y Jet5y January 2017 Hardware
  • Kempston option spazzing outHi again I have a speccy 48k issue 6a. With it I have a Datel Kepston interface and a konix speedking joystick, all of them in my posession since…

    ... value read by the Z80 CPU is whatever the value is ... failure.

    You can test the joystick and interface with ... />
    [u]Kempston Joystick Interface Test Program[/u][code]
    10 ...
    1024MAK 1024MAK February 2017 Hardware
  • c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…

    ... playback for 1,6% of CPU time (5 raster line)
    Test version[/url] is available, please ... test it :)
    SIDBasic.tzx is ...
    Geco Geco February 2017 Announcements
  • 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…

    ... sensitive to the type of CPU. Best was using a NMOS ... CPU. With 6MHz type CMOS I ... divIDE interface while 4MHz CMOS CPU worked better.

    I ... and B signals of the test pattern with an oscilloscope.
    ingo ingo March 2017 Hardware
  • ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcEY4ajVk…

    ... information, maybe between the Z80 CPU /INT circuit and another line ... on resistance, Ohms range) to test for short circuits.

    1024MAK 1024MAK March 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... range or continuity range) to test that the tracks for the ... the board.

    Also, test and check that there are ... address bus between the Z80 CPU and the lower RAM, so ...
    1024MAK 1024MAK April 2017 Hardware
  • Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…

    ... data is returned to the CPU is another matter.

    test to work out how much ... the same time that the CPU is attempting to read non ...
    1024MAK 1024MAK April 2017 Hardware
  • ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …

    ... type, add sockets for the CPU, PCF and ROM. I would ... Bank Switch and burn two test ROM images with the EEPROM ... a breakout board underneath the CPU like this: [img]http://images84 ...
    Claudius Claudius April 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... even with a soldered in CPU. Use the 2000 ohm / 2k ... to the Z80 pin 22. Test the /RD pin (21) as ... />
    There is one further test you can do... back in ...
    1024MAK 1024MAK May 2017 Hardware
  • ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …

    ... as a TVoutput. For basic test you might connect TV to ... on the top of the CPU (spider mod).

    Be ... need 4MHz or faster Z80 CPU (A, B or H type ...
    Claudius Claudius May 2017 Hardware
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    That's an interesting test @Woody. Just tried it out ([ ... right.
    So effectively the CPU is able to perform 10 ...
    adrian_singh adrian_singh June 2017 Development
  • ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …

    ... super fast or constantly burning CPU cycles. Just a USB link ... OS. And I need to test them on the real thing ...
    tstih tstih June 2017 Hardware
  • ZXBaremulator 35th anniversary editionHi, to celebrate the 35th Spectrum anniversary, I've released the first complete Spectrum 48K bare-metal emulator for Raspberry PI. It's available…

    ... it again, an extensive test with versions 1.0 and ... is handled by one CPU and the emulation uses ... a different CPU.

    You can ... />
    That sets the CPU speed from 600 Mhz to ... heatsink installed over the CPU or you can burn ...
    zx81 zx81 June 2017 Emulators
  • ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …

    ... /> Take control of Spectrum's CPU
    Reset counters to zero ... internal counter in 8266
    Test if transfer completed - if no ... control of the Spectrum's CPU and reset it

    1024MAK 1024MAK July 2017 Hardware
  • Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…

    The first test on any faulty board, is ... can and are affected by test gear (meter, logic probe, oscilloscope ... stage. With the Spectrum, test the CPU clock input (pin 6).
    1024MAK 1024MAK July 2017 Hardware
  • Joystick IssuesHi guys, I'm having a few issues getting joysticks to work well on my Spectrum 128k. I've got a Power Play Joystick interface and I've tried it with…

    ... value read by the Z80 CPU is whatever the value is ... failure.

    You can test the joystick and interface with ... />
    [u]Kempston Joystick Interface Test Program[/u][code]
    10 ...
    1024MAK 1024MAK July 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... Spectrum is to use a test ROM. I can point you ... to a test ROM file. It just needs ... the CPU is working, the code in the test ROM can test the ...
    1024MAK 1024MAK August 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... receiving instructions from the Z80 CPU.

    If ... RAM is faulty, the CPU should be still be ... course, this assumes the CPU can read the keyboard ( ... regulator), using a test probe, test each of the ULA ... />
    Next up, test that the PCB tracks are ...
    1024MAK 1024MAK August 2017 Hardware
  • Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…

    ... said Semiconductor. So for the CPU, test the clock on pin 6 ...
    1024MAK 1024MAK August 2017 Hardware
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... "]Hikaru I've tried your test. I see the same what ... exact value depending on the CPU speed in a given Spectrum ... . 69888 for the 48K. The test is simply [url=http://faqwiki ...
    Hikaru Hikaru September 2017 Development
  • Strange Fault on 128 +2 GreyHi I've got 2 128 +2 Grey Spectrums and I thought they were both in good working order but it seems not but I have no idea what is wrong with one …

    ... good spectrum in order to test by swapping them.[/quote]
    CPU executes a I/O IN ...
    1024MAK 1024MAK September 2017 Hardware
<1…19202122232425…34>

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