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Search Again :: Adv Search 1000 results in 0.013s
<1234567…34>
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... sure. When I put the upper ram chips back in place, everything works ... fine again.

    The upper ram are not on the "OKI ... someone that also has the upper ram module be so kind and ... Divide attempts DMA to the upper RAM and uses unusual timings that ...
    gtsamour gtsamour September 2013 Hardware
  • Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…

    Does anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more available than the 4164. Winston? Piters??

    TIA
    DEATH DEATH August 2007 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…

    ... went on to desoldered the upper ram ic's, socketed the board ... and replaced the ram with known good chips. Peeked and poked ... the upper ram with known good ram from another Issue 2, same chips with ... upper ram as I swapped and changed two lots of known good chips ...
    retrogamemart retrogamemart December 2014 Hardware
  • Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…

    ... doesn't see the upper 32k of RAM.

    When ... , tells me that lower RAM is good, all upper RAM bad. But the ... all the associated logic, and RAM chips, with no effect. I've ... all direct connections between the upper RAM and associated logic, and I ...
    DistantStar001 DistantStar001 June 2022 Hardware
  • 256K RAM chips in Spectrum 128KSince I have lot of 256K RAM chips, and my 128K has RAM error, I think about replacing all 16 RAM (64K ones) chips with 256K chips. Then it would be …

    ... lot of 256K RAM chips, and my 128K has RAM error, I think ... about replacing all 16 RAM (64K ones) chips ... with 256K chips.
    Then it ...
    piters piters October 2006 Hardware
  • Wanted 10 - 4116 Ram ChipsHi Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minimum of …

    Hi
    Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minimum of 50 from Hong Kong but only need 10.

    Best wishes
    Martin Baugh
    Martin Baugh Martin Baugh March 2007 Wanted
  • Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…

    ... Gun method of removing the RAM chips from a 4S circuit board ... . I wish to check the RAM chips, I have a Logic Probe ...
    Martin Baugh Martin Baugh April 2007 Hardware
  • +2B ram chips?Hi all, I have got 2 Plus2B`s and 1 Plus2 gray case. Ok the one Plus2B don`t work, so I tried to see if I could pin down the problem. I changed the …

    ... />
    There are 4 ram chips on sockets on board the ... Plus2B.
    The one ram chip IC6 had a ... /> I then removed 2 ram chips IC6 and IC4 replace dwith ... 2 other ram chips that to be honest ... />
    If its the ram chips then I shall buy some ...
    swift240 swift240 June 2007 Hardware
  • Test single ram chips?Is it possible to test single ram chips? Micky

    Is it possible to test single ram chips?


    Micky
    -Micky -Micky January 2010 Hardware
  • 4116 ram chipsI need some ram chips to fix my 48k + issue3b, I have done the composite video mod and it works, now i just wanna play games on it but its stuck on r…

    I need some ram chips to fix my 48k + issue3b, ... advised to replace the lower ram chips. I can't test voltage ... but plan to 'piggyback' chips to try and find the ... ). Does anybody have any spare chips to sell or know where ...
    rustyredline rustyredline January 2010 Wanted
  • Spectrums with gold RAM chips?Hey people, This is a first for me: [img]http://www.mutant-caterpillar.co.uk/ian_stuff/blingspeccy.jpg[/img] Is it normal to have gold RAM chips? …

    Hey people,

    This is a first for me:

    [img]http://www.mutant-caterpillar.co.uk/ian_stuff/blingspeccy.jpg[/img]

    Is it normal to have gold RAM chips? I've not seen this before!
    Spirantho Spirantho May 2011 Hardware
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... passed from testing lower RAM to upper RAM. Here is an example ... first read from the upper RAM location retrieved the decimal ... . were then established in upper RAM, but the system later ... capture the RAM-FILL routine passing from lower RAM to upper RAM, but ...
    Zorn Zorn April 2012 Hardware
  • Lot's of ZX Spectrum parts: RAM chips, ULA's, etcI have new stock of 100% tested parts. I even got my hands on a bunch of ULA's!! [IMG]http://benophetinternet.nl/hobby/sales/parts/IMG_6068.JPG[/IMG…

    ... ]

    Prices:

    - Ram chips: 4164, 4532, 4116, etc
    - Logic chips: 74LSXX
    - Transistors: replacements for ...
    bverstee bverstee December 2012 Sales
  • 4116 Ceramic Ram ChipsHi all, I have a few 4116 Ceramic Ram Chips to sell. If you have any interest, please PM. Greetings, Retrorepair

    Hi all,

    I have a few 4116 Ceramic Ram Chips to sell.

    If you have any interest, please PM.

    Greetings,
    Retrorepair
    retrorepair retrorepair June 2013 Sales
  • Anyone got any 4146 RAM chips?Hi I'm looking for some 4164 RAM chips, as would be fitted to a 128k Spectrum (+, +2, +3 I think they all use the same memory). Not out of a 48k mac…

    ... 'm looking for some 4164 RAM chips, as would be fitted to ... though as these were "defective" chips that only have 48k bits ...
    JonB JonB June 2013 Wanted
  • ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…

    ... for something similar for the upper 32K RAM in a Spectrum.
    upper RAM module instead or one of ... of trailing wires, so the upper RAM module uses almost the same ... as the lower RAM replacement and emulates dynamic RAM.

    ...
    Zorn Zorn July 2013 Sales
  • 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…

    ... diagnostics said the whole of upper RAM was faulty (check all ICs ... , I've removed all the upper RAM ICs, replaced with sockets and ... .

    Given the lower RAM used to be okay, and ...
    Paulcatchpole Paulcatchpole December 2016 Hardware
  • Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…

    ... have 1 spare lower ram, and 1 spare upper ram IC's you ...
    Your Spec-chum Your Spec-chum September 2017 Wanted
  • upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…

    ... would just fry the lower ram again .. this is one board ... looks like somebody attacked the upper ram with a black and decker ... .. any sugestions for replacing the upper ram tracks ?
    mark8bit mark8bit September 2020 Hardware
  • Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…

    ... upper RAM position (IC15-22)
    41256 chips work in place of 4164 upper RAM chips ...
    V53C256P80L chips work in any upper RAM ... position (IC15-22)
    MN41257-12 chips work in any upper RAM ...
    DEATH DEATH December 2006 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... eight 4116 DRAM chips. These are very primitive chips, each chip ... space entirely.

    The upper RAM, from 32KB to 64KB on ... away. Going over the RAM chips with the scope I was ... machines, as each of the upper RAM chips contributes a single bit to ...
    Womble Womble August 2010 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... looking RAS signals at all RAM chips (upper and lower).

    ... at all
    the upper RAM chips, which I imagine is correct ... input pins of all RAM chips
    (upper and lower), though ... - WE is ~5V at all RAM chips (upper and lower).

    ...
    Zorn Zorn November 2011 Hardware
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... the lower ram chips have faultered. This motherboard had upper ram chips socketed ... 7.85k on other upper ram chips), and the manual suggests ... 2000k, as with other upper ram chips), and not below 20k, ... fitting back all the upper ram chips, the pattern on the ...
    deckard deckard January 2012 Hardware
  • Issue 4A issuesHi all, I've been trying to get the Issue 4A board that came DOA with the case I purchased for my Frankenspectrum to work. I've recapped and socket…

    ... and socketed all chips, and verified that the lower RAM IC sockets ... no lower RAM present at all, however all the 4116 chips are ... /> I've also removed the upper RAM chips and the associated logic in ... mean that all the existing chips are toast? Any other ...
    balford balford June 2013 Hardware
  • No text at startupGreetings from Norway all Spectrum enthusiasts. I hope someone can help me with this. When I power up my Spectrum 48k (issue 3b) I get a white border…

    ... screen. I have replaced all upper RAM chips and replaced capacitors without any ...
    zxviking zxviking November 2014 Hardware
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... _all_ the lower 16K RAM chips in my dead Speccy, ... that writes to screen RAM every bit pattern, and ... copies it to screen RAM, hence testing write and ... Z80 is good - great debugging chips!

    Once ... by one of the upper RAM chips! A quick replacement later ...
    Spirantho Spirantho June 2005 Sinclair Miscellaneous
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... replaced _all_ the lower 16K RAM chips in my dead Speccy, I ... Z80 is good - great debugging chips!

    Once I'd ... with (!) by one of the upper RAM chips! A quick replacement later and ... +2 now: I have suspected ram fault (coloured flashing blocks). I ...
    Timppa Timppa September 2005 Sinclair Miscellaneous
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    Hi all,

    yesterday I installed upper RAM chips (TMS4164-20). When I power up the ZX Spectrum it boots fine but only sees 32Kb of memory (PRINT PEEK 23732+256*PEEK 23733 returns 32767).

    Any ideas?
    Thank you,
    Misko
    miskox miskox September 2005 Sinclair Miscellaneous
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... ,

    yesterday I installed upper RAM chips (TMS4164-20). When I power ...
    miskox miskox September 2005 Sinclair Miscellaneous
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... ,

    yesterday I installed upper RAM chips (TMS4164-20). When I power ...
    miskox miskox September 2005 Sinclair Miscellaneous
<1234567…34>

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Related Threads

  • Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
  • RAM chips are 4164s and 4564s interchangeableI paid for some 4164s online, for upgrading my Spectrum 16K to 48K, and I've been given 4564s. I've tried these along with the correct logic ICs and …
  • 256K RAM chips in Spectrum 128KSince I have lot of 256K RAM chips, and my 128K has RAM error, I think about replacing all 16 RAM (64K ones) chips with 256K chips.<br /> Then it wou…
  • Wanted 10 - 4116 Ram ChipsHi<br /> Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minim…
  • Testing RAM Chips After RemovalHi<br /> <br /> I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I hav…
  • +2B ram chips?Hi all, I have got 2 Plus2B`s and 1 Plus2 gray case.<br /> <br /> Ok the one Plus2B don`t work, so I tried to see if I could pin down the problem.<br…
  • Problem with replacing all upper memory with 4164 chipsGuys, i have a problem with the high memory of a 4B issue.<br /> <br /> At first the board had OKI chips for high memory and one of them was faulty. …
  • Test single ram chips?Is it possible to test single ram chips?<br /> <br /> <br /> Micky
  • 4116 ram chipsI need some ram chips to fix my 48k + issue3b, I have done the composite video mod and it works, now i just wanna play games on it but its stuck on r…
  • Looking for some 48k RAM (upper 32k bank)Greetings,<br /> I was wondering where I could find some upper RAM for a 48k (issue 4A).<br /> It's the Texas Instruments TMS4532-20NL4 P8419 (or …

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