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<1…20212223242526…34>
  • Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…

    ... the RAM chips.

    Note that if a faulty DRAM IC ...
    1024MAK 1024MAK April 2016 Hardware
  • So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…

    In the +2, the TEA2000 chips only purpose is to generate ... chip is removed, or becomes faulty (as long as it's ...
    1024MAK 1024MAK May 2016 Hardware
  • What low fat crisps are nice?Owing to the fact that Nature is a total git, every food that tastes nice is bad for you. And when you're the wrong side of forty, your body decides …

    ... animal fats. I'm a 48 year old with a 32 ... urge I get the Kettle chips SnV. Full fat yummies, but ...
    Luny Luny May 2016 Chit chat
  • Something is missing from my life.I've been bandying around with the idea of why it's just not quite the same, even when playing Spectrum games as it was back in the eighties. . A…

    ... in plain sight, in those 48 (128?) Kb, because there's no ...
    Hikaru Hikaru May 2016 Games
  • Spectrum 128k +2A Resets after loadingHey Everybody, I'm from Australia and I'm new here in the forums. I was hoping to pick everyones brains over a problem with a Speccy I acquired o…

    ... it must have been some faulty ram chips. I was able to ... source 4 new NEC RAM chips and replaced all four of ...
    theadamtron theadamtron June 2016 Hardware
  • 48K Issue 2 Spectrum showing exactly 16KI've acquired an issue 2 and it quickly became clear that only 16K of memory is available. I've read that some early 48K Spectrums with malfunctionin…

    ... how you've determined the faulty RAM chips.

    If each ... bit and POKEing the first faulty location attempts to store one ...
    LoonyJetman LoonyJetman August 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…

    ... able to swap between several chips, while testing, I decided to ... lot harder to replace a faulty wire that got buried under ... /working wires to reach the faulty one, due to how the ... had enough clearance to fit chips, but the one facing users ...
    RMartins RMartins September 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…

    ... either the ULA is partly faulty, or there is a fault ... one or more 4116 DRAM chips?

    [b][i]Mark ...
    1024MAK 1024MAK September 2016 Hardware
  • Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…

    ... / sound out circuit can become faulty. This can affect loading, saving ... there are no new ULA chips to buy, it's best ...
    1024MAK 1024MAK October 2016 Hardware
  • Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…

    ... / sound out circuit can become faulty. This can affect loading, saving ... there are no new ULA chips to buy, it's best ...
    britain4 britain4 October 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…

    ... then fitted eight new 4164 chips and reassembled the machine, and ... all upper RAM to be faulty.

    [img]http://www ...
    Paulcatchpole Paulcatchpole December 2016 Hardware
  • ZX Spectrum 48k tape loading issueHi guys I have refreshed a ZX spectrum 48k with a new keyboard layer and front case. The machine will power up and seems to work good. Unfortunate…

    ... be a case as memory chips work and they also use ... or the worst case scenario, faulty ULA.

    What is ...
    Claudius Claudius December 2016 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…

    ... pins of the 4116 DRAM chips. Loss of the -5V supply ... will cause these chips to malfunction, or worst, kill ... one or more 4116 DRAM chips are faulty. In the Spectrum, all ... the DRAM chips are 1 bit wide ...
    1024MAK 1024MAK January 2017 Hardware
  • Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…

    ... took a look at the chips and to my absolute horror ... - I thought if it was faulty it might be a case ...
    The Mighty Dopethrone The Mighty Dopethrone February 2017 Hardware
  • Getting a +3 working again (keyboard & tape socket issues)So, as part of my Spectrum restoration project I will also try to tackle the problem child among my fleet, the +3. PROBLEM ONE: Ever since I firs…

    ... took a look at the chips and to my absolute horror ... - I thought if it was faulty it might be a case ...
    RobeeeJay RobeeeJay February 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…

    ... one of the upper RAM chips (IC15) and there was no ... could do (the lower RAM chips are no longer there so ... think that the ROM was faulty. The ULA of course is ...
    Mikelone Mikelone 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…

    ... you must have OKI RAM chips which function as fully working ... upper RAM IC's are faulty.
    balford balford 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…

    ... must have OKI RAM chips which function as fully ... upper RAM IC's are faulty.[/quote]

    ... which indicates Ic20 was faulty to confirm this I swapped ... the faulty IC20 with IC22, so ... eyes confirming that is a faulty chip.

    ...
    povvercrazy povvercrazy April 2017 Hardware
  • ZX Spectrum spare parts : "endangered" and functional "extinctions" only It struck me how some Spectrum spare parts or parts that were used with Spectrums and that were commonly available are no longer available . The em…

    ... ) Drop in Replacement Lower RAM Chips (4116-150's

    48 ULA Replacement

    B ... .retroleum.co.uk/zx-spectrum-chips"]store.retroleum.co.uk/zx ... -spectrum-chips[/url]

    C) Sub ...
    harriusherbartio harriusherbartio April 2017 Hardware
  • Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…

    ... had as ROM 16 RF2 chips, the second 4 RF4 chip ... advanced clones such as Pentagon 48, with which the L'vov ...
    Alessandro Grussu Alessandro Grussu May 2017 Hardware
  • SD Card Interfaces for the ZX Spectrum : the complete list OK I admit it : this thread will start life as the incomplete list of SD card interfaces but the aim is to list the lot

    ... ’ is the only ZX Spectrum (48,128,+2,+3) expansion device ... port.
    - Non-volatile 128 KB RAM drive, for application that ...
    Dan Antohi Dan Antohi June 2017 Hardware
  • +3 memory repair- which ICHi there, I'm trying to repair an old +3 and have bought a Retroleum SMART card. The diagnostic rom test says that the upper ram is faulty and give…

    Upper 4bits of the upper RAM been corrupted. This Spectrum was built using 64K x 4bit DRAM chips like 41464 or 4464. Looking on the schematic I would bet on the IC6 being faulty.
    Claudius Claudius June 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 …

    ... could not resist it . A faulty 48k Spectrum for £22.00 ... connector and lots of socketed chips.The case looks OK and ... thing is oxidization of the chips . So I gave them a ...
    harriusherbartio harriusherbartio 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…

    ... . As will the 4116 DRAM chips. Some Z80 CPUs also feel ... some of the 4116 DRAM chips are consuming more power than ... the 4116 DRAM may be faulty). If this is the case ...
    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…

    It maybe a faulty ULA. However, despite running warm, ... that reads the RAM is faulty, the CPU should be still ... go to the 4116 DRAM chips may have been swapped compared ...
    1024MAK 1024MAK August 2017 Hardware
  • Help with Spectrum +2 or 128 (AY sound test) Hello, could you help me with something? It's like some "scientific experiments" with the [b]AY-3-8910[/b] / AY-3-8912 chips. I've bought on …

    ... "?) external card for my ZX 48 so a +2 wouldn't ... /> About the AY-3-8910 chips I got, I remember I ... =68134.msg2258408#msg2258408). So those chips are maybe broken, but also ...
    farvardin farvardin August 2017 Hardware
  • Troubleshooting RAM IC's on Spectrum +2 Grey?Got myself a grey +2 but at startup it shows something very similar to this: [img]https://preview.ibb.co/mmai5F/2_Ram_Fault.png[/img] I also su…

    ... work out which IC is faulty. It is designed for the ... earlier 16/48/+ machines, however can be used ...
    Your Spec-chum Your Spec-chum August 2017 Hardware
  • Troubleshooting RAM IC's on Spectrum +2 Grey?Got myself a grey +2 but at startup it shows something very similar to this: [img]https://preview.ibb.co/mmai5F/2_Ram_Fault.png[/img] I also su…

    ... />

    So, the faulty chip or chips must be in the ...
    Renegade Renegade August 2017 Hardware
  • ZX Spectrum 48k ULAlooking for a ZX Spectrum 48k ULA Thanks Phil

    If a modern replacement will do, go to [url="https://www.retroleum.co.uk/zx-spectrum-chips"]https://retroleum.co.uk/zx-spectrum-chips[/url] and quickly bag a Nebula - A Spectrum 16/48 ULA Replacement Module.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK September 2017 Wanted
  • Hardware description - BETA DISK interfaceExist more versions and clones of BETA DISK interface. Beta disk 48, beta disk 128, brasilian clones of beta disk 48, russian clones of beta disk 128…

    ... with ROM compatibility, because Betadisk 48 not select ZX48 rom after ... start and all ZX128 kB models start with different rom ...
    velesoft velesoft September 2017 Hardware
<1…20212223242526…34>

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