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<1…21222324252627…34>
  • 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…

    ... all of them. When faulty, they are known to destroy RAM chips.
    Ast_A_Moore Ast_A_Moore 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…

    ... .retroleum.co.uk/zx-spectrum-chips"]https://retroleum.co.uk/zx ... -spectrum-chips[/url]

    I hate ... ran the test on my faulty Speccy which highlighted the faults ... . This has made repairing this faulty Speccy much easier for me ...
    Your Spec-chum Your Spec-chum 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…

    ... repair. Yes there maybe some faulty lower ram IC's, but ... don't rule out any faulty upper ram IC's either ... fixer-upper with the new chips, new membrane and nice packaging ...
    Kamineko Kamineko 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…

    ... pins of the 4116 DRAM chips. It's important that ... 5V otherwise the 4116 DRAM chips may be damaged. If ... trying the ULA from this faulty board in a known ... pins on the old 4116 chips, then desolder one leg ... to buy some more 4116 chips...

    [b][i ...
    1024MAK 1024MAK October 2017 Hardware
  • Help with a TIMEX TC2048 and memory problemBought a 2nd hand Timex TC2048 but unfortunately I detected a problem with the machine which is preventing it from working properly. I believe it …

    ... 16384 by 4 bit DRAM chips. One pair will give you ... of the 74LS157 multiplexers is faulty.

    [b][i]Mark ...
    1024MAK 1024MAK December 2017 Hardware
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... , so I assumed this was faulty. I will do some continuity ... :-
    At the 4116 DRAM chips, test the +12V and the ...
    dozey_dustman dozey_dustman December 2017 Hardware
  • Broken Issue 2 - likely culpritsI've just got hold of an issue 2 spectrum with an interesting layout (heatsink is vertical and goes down to the speaker, some variable resistors and …

    Yes, if the /RAS signal from the ULA to the 'lower' RAM chips is poor, it will cause problems. But it is worthwhile checking the 'faulty' ULA in a known good machine.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK April 2018 Hardware
  • help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …

    ... clarification: the "upper" RAM chips only need a single +5V ... .

    The 'lower' RAM chips (type 4116 or equivalent) require ... can damage the 4116 RAM chips.

    The symptoms you ... very likely caused by a faulty RAM chip.

    The ...
    1024MAK 1024MAK July 2018 Hardware
  • Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…

    If was just the ROM faulty, the diagnostic would not find ... that one of the multiplexer chips has a problem (IC3 & ...
    1024MAK 1024MAK July 2018 Hardware
  • what components normally get taken out if you plug+unplug a joystick interface in with the power onwhat components normally get taken out if you plug+unplug a joystick interface in with the power on? i remember doing this a few times when i had …

    ... on the Spectrum. Logic level chips will be damaged if subjected ... CPUs in ZX Spectrums have faulty /M1 outputs (it not being ...
    1024MAK 1024MAK October 2018 Hardware
  • help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …

    ... 'd suspect the lower RAM chips first - obviously check the work ... has been corrupted - indicative of faulty RAM, and I'd say ... being messed up by a faulty RAM chip or two. Not ... RAM is to blame, those chips are expensive now and hard ...
    DEATH DEATH December 2018 Hardware
  • Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…

    ... of the 32k bit (half faulty) DRAM chips, therefore giving the machine ...
    1024MAK 1024MAK December 2018 Hardware
  • Faulty as sprctrumsHi guys I have just received a dk tonics keyboard and to my surprise there is an issue 6 as spectrum inside and an interface 1 yay me but I am ge…

    ... maybe both interface ones have faulty ULA chips as the one that ...
    caver99 caver99 January 2019 Hardware
  • Toastrack memory replacementHi! Can the ram chips in 128k toastrack be replaced with tms4532-15nl3 chips from 48k speccy? I get white border with corrupted screen when boo…

    ... x 1 bit DRAM chips, but with only half ... 32k x 1 bit DRAM chips.

    I ... never tried putting such chips in a 128K machine. ... what it will see as) faulty DRAM chips.

    AllI ... different variations of TMD4532 chips, depending on which section ...
    1024MAK 1024MAK May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... it would also show up faulty ROM chips.
    guesser guesser May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... it would also show up faulty ROM chips.[/quote]

    @Ast_A_Moore ...
    colourclash colourclash May 2019 Hardware
  • Rod-land - struggling to get working on my real +2 (grey machine)Hi Everyone, I've had a week enjoying tinkering with my +2 and there are only a few games I have not managed to play on my +2 that I enjoyed back …

    ... case scenario could be some faulty capacitors. Months ago I discovered ... some programs to test memory chips available, try searching the forum ...
    Alessandro Grussu Alessandro Grussu June 2019 Games
  • 48K Issue 2 RAM issuesI have 48K issue 2 board (I've checked, the upper memory is present!). It's not very well. I've not attempted to diagnose one before, so please bear …

    ... is made up of eight chips, with one chip being used ... storing that bit as being faulty.

    If BASIC works ...
    1024MAK 1024MAK August 2019 Hardware
  • 48K Issue 2 RAM issuesI have 48K issue 2 board (I've checked, the upper memory is present!). It's not very well. I've not attempted to diagnose one before, so please bear …

    ... two DRAM chips that provide bits 2 and 5 are faulty.
    1024MAK 1024MAK August 2019 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... ? I know sometimes ram chips can be faulty, or the ULA. Anyway ...
    dmsmith dmsmith August 2019 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... ? I know sometimes ram chips can be faulty, or the ULA. Anyway ... booted if the Spectrum has faulty ram IC's. The diagnostic ... will identify which IC is faulty making fault finding a breeze ... ]

    And regarding the faulty eBay Spectrum. If the seller ...
    Your Spec-chum Your Spec-chum August 2019 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 …

    ... say the sanding of the chips in the Cheeta seems strange ... damage they can cause if faulty is not worth the risk ...
    moggy moggy October 2019 Hardware
  • Additional Information , Notes , and Details , re.the Main Windows Edition of Spectaculator There is no lenghy instruction to go with Spectaculator . Mark did a great job adding extra info. with this thread:- [url="https://worldofspectr…

    ... the flash drives that were faulty ( I was reluctant to conceed ... of these chips having to sidestep any sectors that are faulty in ... area generally , it seems that faulty sectors are an inherent part ... screenshot to prove it was faulty with 64 bit Windows in ...
    harriusherbartio harriusherbartio August 2020 Emulators
  • If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…

    ... were present in said later chips that could of opened up ... fixing up the later 16/48 ROM with say the NMI ... worse than running some old 48 games on the toastyrack perhaps ...
    spider spider August 2020 Hardware
  • If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…

    ... fixing up the later 16/48 ROM with say the NMI ... worse than running some old 48 games on the toastyrack perhaps ... ’ was incorporated in later ULA chips, but the original design error ... tools for designing gate array chips would have been substantially better ...
    1024MAK 1024MAK August 2020 Hardware
  • Speccy 4A board problemHi all. I was hoping for some help with my Speccy (with 4A Board) before I send it off for repair. When I power it on all looks fine (i.e. copyright …

    ... ’ RAM (4116 or equivalent DRAM chips). But it could also be ... stack getting corrupted due to faulty ‘upper’ RAM.

    The ... any of the 4116 DRAM chips are hotter than the others ...
    1024MAK 1024MAK September 2020 Hardware
  • If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…

    ... accident destroyed most of the chips and I shelved it. I ... have 2 Plus's, A faulty rubber key model I'm ... the lower 16K memory is faulty and the ULA missing... And ...
    cj7hawk cj7hawk February 2021 Hardware
  • (Fixing) The Swordsman of Kraxis 7The Swordsman of Kraxis 7 ([url="https://worldofspectrum.org/software?id=0013314"]link[/url]) is an arcade adventure, from a type-in book (in BASIC).…

    Yes, the use of FGH is covered in the instructions, inside the book. I'd like to type in the instructions and the story too, but it's just a lot of text for now.

    Anyway, let me just post a fixed version here (I might fix more of it, but ...
    Timmy Timmy March 2021 Sinclair Basic
  • Keeping up to date with PC builds.I only do PC builds infrequently and I have stopped reading Micro-Mart so my abilities in the area can languish pretty quickly. But if it is new i…

    ... this like the Spectrum RAM chips that you can skip the ... because you know they're faulty?
    Timmy Timmy March 2021 Chit chat
  • Keeping up to date with PC builds.I only do PC builds infrequently and I have stopped reading Micro-Mart so my abilities in the area can languish pretty quickly. But if it is new i…

    ... this like the Spectrum RAM chips that you can skip the ... because you know they're faulty?[/quote]
    The problem with ...
    rich_chandler rich_chandler March 2021 Chit chat
<1…21222324252627…34>

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