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  • 128K Spectrum - can't figure out what's wrongLong time no post :) So I have this 128K Spectrum (+2 ROMs) that I cannot for the life of me figure out where the problem lies. Let's take a look a…

    ... -up.

    The Z80 CPU appears to be running the ... write some simple machine code test programs and can burn your ...
    1024MAK 1024MAK December 2014 Hardware
  • Issue 2 Upper Ram, Loading & ResettingI have a 48k Issue 2 Speccy and for the life of me can't track down what the problem is with it. I initially thought that some of the uppe ram ic's w…

    In that case test the data line from IC22 to the CPU. It may be the track has a hairline break.

    [B][I]Mark[/I][/B]
    1024MAK 1024MAK December 2014 Hardware
  • 1985-2015.A topic where we can review games released on the Speccy 30 years ago, or, anyway, talk about that year.

    Ian Botham's Test Match
    [IMG]http://www ... what the jolly old Spectrum CPU thinks is going on. Spin ... . The saving grace is the CPU's batsman were as flummoxed ... score of 73 in the Test edging my button mashing 63 ... at the end of the Test and this travesty of a ...
    Jumping Stack Jumping Stack January 2015 Games
  • ZXMAK2Hi everyone, I'm glad to present you the latest version of my emulator - ZXMAK2 :) There are a lot of changes were made since the last topic about t…

    ... ]

    According your noflic test, Unreal Speccy (with frame resampler ... 1.6 ghz dual core cpu and lcd monitor 60hz.
    cpu occupancy, but scroll still isnt ... to buy a quad core cpu, just because of these feature ...
    Pegaz Pegaz January 2015 Emulators
  • ZXMAK2Hi everyone, I'm glad to present you the latest version of my emulator - ZXMAK2 :) There are a lot of changes were made since the last topic about t…

    ... 812282]According your noflic test, Unreal Speccy (with frame ... 6 ghz dual core cpu and lcd monitor ... MAK2, has 50-60% cpu occupancy, but scroll still ... buy a quad core cpu, just because of these ... br /> Unfortunately I cannot test Unreal Speccy. Because it has ...
    ZXMAK ZXMAK January 2015 Emulators
  • ZXMAK2Hi everyone, I'm glad to present you the latest version of my emulator - ZXMAK2 :) There are a lot of changes were made since the last topic about t…

    ... and ocassional audio stops. My CPU is a quad core Intel ... , there is need for a test :)

    If you have ... device (no shared memory with CPU)? Is the virtual device framework ... your own spectrum configuration and test it:
    [IMG]http://savepic ...
    ZXMAK ZXMAK January 2015 Emulators
  • Strange keyboard port reads on 48+Hi all, I don't know whether it was already discussed (I also searched forum, but there are too much of results searching "48k keyboard" so I didn't…

    ... some addresses):[CODE] cpu z80undoc
    relaxed ... /> di
    call test
    ei
    ... ret

    test
    loop
    rept ...
    ub880d ub880d January 2015 Hardware
  • spectrum +2A loading problemHi new here ! I have recently purchased a 2A thinking it would be more reliable than my old rubber key machine and external tape drive. Problem i…

    ... run a memory test (which will also exercise the CPU).

    1024MAK 1024MAK February 2015 Hardware
  • DivMMC Enjoy - I'm not enjoying it!My DivMMC Enjoy arrived today. Excitedly I rushed home to plug it into my +2a. I have quite a few SD card/CF solutions for my computers so I know wha…

    ... 1 (no cap on the CPU):[/B] This board had no ... ok and passed all ram test (paul farrow's cartridge ones ...
    BCH BCH February 2015 Hardware
  • DivMMC Enjoy - I'm not enjoying it!My DivMMC Enjoy arrived today. Excitedly I rushed home to plug it into my +2a. I have quite a few SD card/CF solutions for my computers so I know wha…

    ... 1 (no cap on the CPU):[/B] This board had no ... ok and passed all ram test (paul farrow's cartridge ones ... I haven't done a test on it yet.

    guesser guesser February 2015 Hardware
  • google ai and gaming[url]http://www.bbc.co.uk/news/technology-31620759[/url] just saw it on the london news.

    ... of hard drive space and CPU power, yet we still can ... who could pass the Turing Test.

    I'll say ...
    ewgf ewgf February 2015 Chit chat
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ... it looks like the Z80 CPU is not running. What the ... screen change?

    What test gear do you have? If ... an oscilloscope test the clock input pin to the Z80 CPU.
    1024MAK 1024MAK May 2015 Hardware
  • Video ZX Spectrum+ 48k<span>Good day ... is a bit of time that I try to fix my zx spectrum ... I replaced the ram 4116, all electrolytic capacitors ... but the monitor loo…

    ... data buses between the Z80 CPU and the DRAM chips, you ... data buses between the Z80 CPU and the DRAM chips are ... the power off, you can test (using the 200 ohm resistance ...
    1024MAK 1024MAK May 2015 Hardware
  • not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …

    ... CPU in a known working board.

    Did you test ... pin 1's etc. Test between pin 2 and 14 ... Then test that each data line (pin) on the CPU goes ... 14).

    Also test that there are no short ... caused by solder splashes. Test between each pin on each ...
    1024MAK 1024MAK July 2015 Hardware
  • New version (v0.31) of ZX DiagnosticsHi all,<br><br>Just wanted to let people know that I've released a new version of the Spectrum Diagnostics into the wild.<br><br>These were originall…

    ... br />
    If the Z80 CPU is dead, the existing diagnostics ... br />
    If the Z80 CPU is okay, and the address ... and no receiving) using just CPU registers is possible.
    < ... improvisations needed.
    An alternative (test) ROM, can be loaded by ...
    Dan Antohi Dan Antohi August 2015 Hardware
  • ZX Spectrum+ adviceHey all, I just got a ZX Spectrum+ from eBay and I'm not sure yet what to do with it. I wanted to first take a peek inside, see what issue board it i…

    ... ). But the best instrument to test for a composite video signal ... speaker. If yes, the Z80 CPU is running BASIC. Note that ...
    1024MAK 1024MAK August 2015 Hardware
  • Grey +2 - DOA and no power lightTook a punt on a grey +2 at the weekend to be a spare. It was "untested" although so were all my other +2's which are all fine. Tried to power th…

    ... getting hot, but the Z80 CPU was getting hot ([b][u ... the speaker.

    What test equipment do you have?
    1024MAK 1024MAK August 2015 Hardware
  • Dead SpectrumHello guys, I've just bought a dead Speccy 48k (Rubber Keyboard Issue 3 board). Basically, when powered on it initially appears to boot up ok, but in…

    ... like the Z80 CPU is attempting a RAM test, but the system ... fails to complete the test. Somewhere there is a video ... tube showing what a RAM test looks like. Blink and you ... video system) during the RAM test.

    [b][i]Mark ...
    1024MAK 1024MAK August 2015 Hardware
  • External Z80 CPUHi Looking for some advice if possible. Many years ago I had a plug-in board for a Spectrum 48k which had a couple of switches, a z80 CPU, and a S…

    ... to disable the internal Z80 CPU, connect /BUSREQ on the ... />
    On the external CPU, use a pull-up resistor ... /HALT on the external CPU to the edge connector. A ... data lines on the external CPU, which in turn connect ... half followed by a test ROM in the other ...
    1024MAK 1024MAK August 2015 Hardware
  • 48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…

    ... />
    By all means recheck / test the supply voltages on the ... vary depending on what the CPU and ULA are doing.
    1024MAK 1024MAK September 2015 Hardware
  • Access to ZX81-Service ManualI need the ZX81-Service manual to repair my sick Zeddy. Unfortunately I don't get access to WOS documents via ftp. How can I register? For the ZX-S…

    ... eliminated the other parts, the test is simple - plug in a ... rewiring.

    The Z80 CPU is fairly reliable, but do ...
    1024MAK 1024MAK September 2015 Hardware
  • External Z80 CPUHi Looking for some advice if possible. Many years ago I had a plug-in board for a Spectrum 48k which had a couple of switches, a z80 CPU, and a S…

    ... have built an external Z80 CPU on a prototype board, but ... to a working board to test. On the edge connector I ... not connected. On the external CPU I've connected /NMI via ... . Every other connection on the CPU has been linked to the ...
    Graham Graham September 2015 Hardware
  • Access to ZX81-Service ManualI need the ZX81-Service manual to repair my sick Zeddy. Unfortunately I don't get access to WOS documents via ftp. How can I register? For the ZX-S…

    ... Zeddy is living again. The test with an external RAM pack ... . Then I have changed the CPU by an CMOS Z80, and ...
    HZJ HZJ September 2015 Hardware
  • External Z80 CPUHi Looking for some advice if possible. Many years ago I had a plug-in board for a Spectrum 48k which had a couple of switches, a z80 CPU, and a S…

    I ended up just copying the clock circuit from an issue 2 board (simply because I had the bits to hand), using a ZTX313. Now working fine - just need to find a spectrum with a dodgy CPU to test it on in real life!
    Graham Graham September 2015 Hardware
  • bmp2scrhttps://www.youtube.com/watch?v=zsjTpFR0oYQ converted for the sam coupe by using bmp2scr can anyone help Leszek Daniel Chmielewski ideally it onl…

    ... perfect in its emulation of CPU and display timings, to my ... of confidence that anything you test in SimCoupe will work on ...
    zub zub September 2015 Development
  • bmp2scrhttps://www.youtube.com/watch?v=zsjTpFR0oYQ converted for the sam coupe by using bmp2scr can anyone help Leszek Daniel Chmielewski ideally it onl…

    ... perfect in its emulation of CPU and display timings, to my ... of confidence that anything you test in SimCoupe will work on ...
    AndyC AndyC September 2015 Development
  • 1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…

    ... the samples. I used tritone-test-2.sna from earlier in ... regular intervals related to the CPU clock cycle? That would make ...
    RobeeeJay RobeeeJay October 2015 Development
  • Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…

    ... )
    ULA: 5C112E 8307
    CPU: Zilog Z84...PS Z80...U ... 8429
    ISSUE 4B
    CPU: NEC JAPAN D780C -1 8423X5 ... /> ULA: 6C001E-6 8344
    CPU: SGS Z8400AB1 Z80ACPU 28345-ITALY ... open it, onw because I test the Issue one and 4B ...
    Z80user Z80user October 2015 Sinclair Miscellaneous
  • Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…

    ... syntax are compatible across different CPU's. I also much prefer ... and .sna to run and test the program at once. And ...
    Alcoholics Anonymous Alcoholics Anonymous October 2015 Development
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... is to see if the CPU can run the code in ... are using DRAM chips), quickly test the supply voltages again, then ...
    1024MAK 1024MAK November 2015 Hardware
<1…17181920212223…34>

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