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  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... expansions / interfaces that have a ROM in them? Or which can ... that prove if it works? ROM fault?

    [quote="1024MAK; ... that can take a ROM/EPROM, a ROM based RAM test program ... RAM turbo interface which takes ROM cartridges but I unfortunately don ...
    memrah memrah December 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    From the symptoms, I think it's highly likely the CPU is faulty, though I couldn't rule out a RAM (upper or lower) fault. It's very rare for the ZX Spectrum ROM to fail. While you're at it, also check the -5 and 12 V power supply rails at the lower RAM.
    Zorn Zorn December 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... work if there was a ROM fault? And yes, that's what ...
    Jet5y Jet5y December 2015 Hardware
  • Problem with 128k +3Got this a while ago on Ebay, just got around to trying it out and face the following problem. Displays garble block on the screen and keyboard does…

    ... depending on the type of fault.

    An alternating white ... at 0x0130 and 0x0367 in ROM 0)

    This should ...
    balford balford January 2016 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... it in a case labelled ROM version F Nought . I then ... . It remains a busted Multiface fault unknown
    harriusherbartio harriusherbartio January 2016 Hardware
  • Issue 3B turning offI'm trying to save a Spectrum Issue 3B. I restored the power supply section, changing the 7805, TR4, and TR5, besides all electrolytic capacitors. No…

    ... the ULA. So any chip (ROM, Z80 and discrete logic ICs ... problem, or a open circuit fault. Does you meter have a ... Speccy behaves, and when the fault just presents itself. If the ... if you can move the fault by swapping chips from one ...
    1024MAK 1024MAK March 2016 Hardware
  • ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…

    ... keyboard/ULA. External interface (where ROM cartrige is connected) is not ... the Z80 CPU can access ROM or "upper" RAM while the ... ]
    Resistors will limit a fault current, absolutely right. But Sinclair ...
    1024MAK 1024MAK July 2016 Hardware
  • Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…

    ... to be fine. The diagnostic rom works ok, i would expect ... the data lines is at fault, am I wrong thinking this ...
    patzik patzik August 2016 Hardware
  • 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…

    ... first things that the BASIC ROM code does is to set ... faulty, or there is a fault on the data bus or ...
    1024MAK 1024MAK September 2016 Hardware
  • Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…

    ... going to be memory at fault but I've swapped out ... have thought the RAM diagnosis ROM would have thrown something out ...
    Jet5y Jet5y November 2016 Hardware
  • 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…

    ... identifying IC25 as being at fault. The graphical upper RAM browser ... test works on that diag rom.

    I've socketed ...
    Paulcatchpole Paulcatchpole 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…

    ... " RAM fault.
    It's unusual for a mask ROM to fail ... the chip). And if the ROM had failed, I doubt you ... the Spectrum's ROM with a memory test ROM image would soon ...
    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…

    ... be an unusual fault with the CPU or the ROM, but for ... machine code instructions from the ROM. That means that the CPU ... of symptoms of a RAM fault. The problem with your machine ... may not be a RAM fault. But RAM faults and faults ...
    1024MAK 1024MAK January 2017 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…

    ... up if it is a rom fault. does the divide have this ...
    cypher007 cypher007 January 2017 Hardware
  • 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…

    ... for RAM faults, is a ROM based test program. A number ... can run a program from ROM (including EPROM/EEPROM/flash memory ... RAM test program running from ROM, does not rely on the ... work out what the RAM fault is.

    The [url ...
    1024MAK 1024MAK January 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…

    ... bytes of memory (16k bytes ROM, 16k bytes RAM, optional 32k ... responding. Either due to a fault, or due to a modification ... chips. If there is a fault here, this will not stop ...
    1024MAK 1024MAK April 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…

    ... :)

    The most likely fault is that one or more ... that the Z80 or the ROM chip have failed. So a ... the Z80 CPU and the ROM chip are at least partially ... the Z80 CPU and the ROM chip will both be okay ... run the code in the ROM chip.

    > ...
    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…

    To aid in fault finding, a test ROM is desirable. The easiest way ... to get a test ROM to run if you don ... it with a suitable test ROM e.g. [url="https://github ...
    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…

    ... and most effective way to fault find a ZX Spectrum is ... point you to a test ROM file. It just needs programming ... a minor change to the ROM selection circuit on the Spectrum ... the code in the test ROM can test the RAM and ... take a EPROM or a ROM file can also perform ...
    1024MAK 1024MAK August 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    I carried on with the recap and finished it . It did not get rid of this fault though . I have no idea why it happened . It has not happened before like this when I have recapped in similar fashion . It appears to be behaving like there is no ROM chip
    harriusherbartio harriusherbartio August 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... to continuity check the ROM on this 6A and ... be because the 4B ROM set up it different ... right pin of the ROM (the pin nearest the ... this same spot (RHS ROM connection nearest the edge connector ... Rom should give any kind of continuity . Could this be the fault ...
    harriusherbartio harriusherbartio August 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... 6A is throwing up a ROM fault screen display indicating there is ... no ROM fitted (when there is one ... is continuity to the VCC Rom point unlike the other Spectrum ... I have found the fault causing the ROM failure?

    Pic ...
    harriusherbartio harriusherbartio August 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... broken or an absent ROM . Well the ROM is not absent ... a short circuit in the ROM itself which now also ... the ROM has to be removed to cure the fault but ... if 1) applies a new ROM could ... tracking then it is the ROM that caused the problem . ...
    harriusherbartio harriusherbartio August 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... pin 22 of the ROM is telling it that ... If the fault is NOT the ROM, fitting another ROM would not ... (active low Output Enable). ROM manufacturers each have different names ... signal which tells the ROM it's okay to ... 5V Vcc supply, the ROM will never output any data ...
    1024MAK 1024MAK August 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... are:-

    1) The fault occurred after just 2 capacitors ... good clean image of the "ROM failure" fault (so as faults go ... appears on the "soldered in" ROM chip itself and other Spectrums ... was wrong and created a fault that has stayed .

    harriusherbartio harriusherbartio August 2017 Hardware
  • In-game Screen FlickeringHi folks, today while playing 'Beyond the Ice Palace' I noticed strange behavior of my Issue 6a Spectrum+. When I pressed '2' (for UP) + 'O' (for …

    ... into part of the Spectrum ROM code.

    The cause ... may be an intermittent memory fault, or something else, like a ...
    1024MAK 1024MAK September 2017 Hardware
  • Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…

    ... myself. It has a display fault very similar to yours where ... Phil's(of Retroleum) test rom pre-loaded. I ran the ...
    Your Spec-chum Your Spec-chum September 2017 Hardware
  • 48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…

    ... " DRAM chips as well while fault finding) power up again and ... BASIC interpreter program from the ROM chip.

    Good luck ...
    1024MAK 1024MAK October 2017 Hardware
  • What's going on inside this ZX Spectrum? [Newbie]Hello folks Last year I got hold of a ZX Spectrum. At the time it appeared to boot up fine, but more recently when I've tried to boot up I've had…

    ... is not related to the fault you are experiencing.

    fault. However, from your description, I ... possibility.

    5. Faulty ROM (rare, so not very likely ... does, it suggests the CPU, ROM and ULA are at least ...
    Zorn Zorn October 2017 Hardware
  • What's going on inside this ZX Spectrum? [Newbie]Hello folks Last year I got hold of a ZX Spectrum. At the time it appeared to boot up fine, but more recently when I've tried to boot up I've had…

    ... down the cause of the fault by using an expansion that ... a test program in a ROM (or equivalent) chip and which ...
    1024MAK 1024MAK October 2017 Hardware
<1…14151617181920…34>

Latest Posts

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  • Fixed Speccy Software. And which games remained unfixed?
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