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  • Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…

    ... IC6-IC13 is the contended RAM, and the one I was ... adapters, and desoldered all the 4164, and f***** up some ... easily turn back to use 4164 again :( The problem is ... to its equivalent in the 4164, and grounded /OE as ... burn en eprom with a ram tester (as I red ...
    kwyjibo kwyjibo October 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... ]If 4864 is a 64Kx1 ram chip, the answer is yes ... 't think you'll have ram problem. In +128K , +12V is ... for TEA2000 chip.

    4164 RAM only use +5v

    Jose_Leandro Jose_Leandro November 2011 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…

    ... will next remove the lower RAM and fit sockets. I would ... least some of it is faulty, especially given that the first ...
    Zorn Zorn November 2011 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…

    ... CPU, or the non contended RAM, as these devices share the ... . The later because a damaged RAM could force a data pin ... a chip in non contended RAM.
    Do the same with ... a faulty CPU, faulty ROM (most probably), or faulty multiplexers. Non contended RAM is ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... CPC 472, which had a 4164 chip in a kind of ... actually used to support 48K RAM, but it's unclear whether ...
    mcleod_ideafix mcleod_ideafix November 2011 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…

    ... the Spectrum+ that had faulty lower RAM rather than the one I ...
    Zorn Zorn December 2011 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…

    ... a few bits in lower RAM are being unreliable.

    faulty bit in a particular location ... anyone here aware of any RAM test software for the Spectrum ...
    Zorn Zorn December 2011 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…

    ... Spectrum mostly works with 4116 RAM installed, but suffers from corruption ... of data in this RAM (as described earlier).

    faulty-issue2-rascas-1.png[/IMG ... the same with no lower RAM installed.

    I put ...
    Zorn Zorn December 2011 Hardware
  • BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…

    ... toward the end ... but my RAM might be faulty.
    ZnorXman ZnorXman December 2011 Development
  • BackgroundDoes anyone know how i would create a background similar to [URL=http://imageshack.us/photo/my-images/42/backgroundmockup.png/][IMG]http://img42.ima…

    [QUOTE=ZnorXman;587838]I think the orange manual actually has a BASIC-to-assembly conversion listing toward the end ... but my RAM might be faulty.[/QUOTE]
    Whats an orange manual?

    Sincerely,

    Ooze48k
    ooze48k ooze48k December 2011 Development
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... voltages between those and the faulty board.

    Ive ordered ... changed. Im really hoping the RAM hasnt died!
    Marshall Marshall December 2011 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... occurs when the lower RAM isn't working correctly ... lot of yours have gone faulty.

    It is, ... some of the lower RAM is faulty, I also recommend removing ... method all the lower RAM ICs can be removed ... to replace the lower RAM with a fairly simple ...
    Zorn Zorn January 2012 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... or more of them were faulty and overloading this supply line ... be down to looking for faulty resistors or PCB trace shorts ... its not connected to the ram Im getting -1v not the ... going to remove all the ram chips and put sockets in ...
    Marshall Marshall January 2012 Hardware
  • Problem with ZX Spectrum (B&W stripes)Hello. I bought a ZX Spectrum, and fortunately, it arrived today. Unfortunately, when I connected it to my TV, this appeared... [IMG]http://i.imgur.…

    ... appears when some of the RAM goes bad (but I couldn ... like that. I have encountered faulty ULAs that only manifest a ...
    Zorn Zorn January 2012 Hardware
  • Rubber 48k troublesHi. I've just got a 48k to add my collection, but it seems doesn't working well. The computer starts ups finely, but it doesn't load the games. So fa…

    ... ;597771]One of your upper RAM chips almost certainly has a ... situation? Or the computer is faulty? =)
    Thanks and sorry for ...
    Spectrum Spectrum January 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... that it would work with RAM installed.

    ... when one of the RAM ICs is faulty. I also tried ... at all the lower RAM socket pins look reasonable ... problem with the lower RAM, but that something else ... stuck. Perhaps an upper RAM problem could cause this - ...
    Zorn Zorn January 2012 Hardware
  • what is this crazy modfound a speccy in my loft yesterday,and it seems to have an external heatsink modd i havent the foggiest about speccys heres a few pics [url]http://i…

    ... is that RAM Bank 2,4 and 6 are reporting faulty, and ...
    Macc Macc January 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... 2 is written to all RAM locations, starting at 0xFFFF and ... as soon as all the RAM has been filled with 2s ... , if the ROM is not faulty, I think something must be ... HL=0x4000 is the first RAM read by the ROM code ... or all CPU reads from RAM.

    Most odd!< ...
    Zorn Zorn January 2012 Hardware
  • Spectrum 48K - upper memory MIAI have recently acquired a ZX Spectrum which, according to the sticker on the bottom, should be a 48K model. It's an Issue 3 board, with upper memory…

    ... a value to all possible RAM addresses. Then, from the ... start of RAM (address 16384) it works ... the end of working RAM has been reached and ... caused by one or more faulty DRAM ICs (IC15-IC22) ... lines connected to the upper RAM, to see whether RAS ...
    Zorn Zorn February 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... the voltage converter circuit is faulty or one or more of ... is /CAS for the lower RAM and attaching a voltmeter to ... power supply from the lower RAM, either by cutting the circuit ...
    Zorn Zorn February 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... =kpuchatek;603333]It seems your faulty board does not have z80 ... want to remove the upper RAM ICs and they are in ...
    Zorn Zorn February 2012 Hardware
  • 4116 and 4164 chip avaliableHi all, while clearing out lots of old odds and sods I have come across a fair number of old dram memory chips. I have 200+ 4164 from various manufa…

    Do you mean the upper 32k RAM (4564's) ?
    I still have plenty of 4164's which are a direct replacement.

    How many are you after?

    Steve.
    shamm shamm February 2012 Hardware
  • ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…

    ... the right of the lower RAM. Axial caps are harder to ... hotter than normal with the faulty regulator and damaged the part ...
    JohnH JohnH March 2012 Hardware
  • RFC: Hardware Documentation ProjectI've noticed quite a few threads recently about missing schematics and suchlike. I've also been thinking about the low quality of some of the schemat…

    ... mode to help finding a RAM failure in non-contended ... the computer, as if all RAM were damaged:
    [url ... 21-noiseandaddresslinemess[/url]

    Faulty Spectrum, but not because the ... memory to help diagnosing intermitent RAM failures:
    [url]http ...
    mcleod_ideafix mcleod_ideafix March 2012 Sinclair Miscellaneous
  • Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…

    ... a ZX81 (even with 16K RAM) could do this:

    faulty ULA and I have to ...
    mcleod_ideafix mcleod_ideafix March 2012 Sinclair Miscellaneous
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... (or all) the upper ram is dead?[/quote]
    ... chips?[/quote]
    - Upper RAM exposes their data bus on ... low memory bank chips. 4164 chips don't have this ... part. They were damaged 4164 chips that had the failure ... were cheaper than the 4164, much in the line ...
    mcleod_ideafix mcleod_ideafix March 2012 Hardware
  • 48k Speccy chucks a wobblerI've got a problem with my rubber keyed 48k speccy. When it is first switched on everything is fine but after a couple of minutes the picture on scr…

    ... problem could be the lower RAM ICs themselves, though usually faults ... quite likely due to a faulty electrolytic capacitor, one of the ... transistors and consequently the lower RAM too. If this Spectrum still ...
    Zorn Zorn March 2012 Hardware
  • 48K's and bad DivIDE compatibilityI have had some 48K boards and complete machines in the past which didn't work fully with a DivIDE interface. The reason for that always was a Z80 pr…

    ... /> All you have left is RAM's and Transistors.... I suppose ... is to know what problem / faulty part was that could be ...
    Zetr0 Zetr0 March 2012 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…

    ... 4116 chips with 4164 and since the upper RAM was socketed, I ... out one of the upper RAM chips, and with some leg ... going on with the upper RAM now! To cut the long ... , the sockets for the upper RAM were the cheap kind and ...
    deckard deckard April 2012 Hardware
  • Dark Screen, non working 48k Spectrum (rubber key)I have an issue 1 (I think) "dead cockroach" 48k Spectrum. On power up I get a dark screen and the machine is unusable - see pics. Any ideas on the…

    ... when there is a lower RAM fault. Are all the supply ... for other recent threads on faulty 48K Spectrums and you'll ...
    Zorn Zorn May 2012 Hardware
<1…18192021222324…34>

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HitBox

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faulty 2.3K 2.8K
ram 12.6K 21.4K
4164 377 528

Related Threads

  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …
  • Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code:<br /> <br /> [CODE]<br /> ;; ram-check<br /> L11DA: LD H,D ; Transfer the top value to the HL registe…
  • Febuary offer - 4164 ram chips: 10pcs ?9, 20pcs ?16Special febuary offer: <br /> <br /> [B]10x 4164 chips[/B]: normally 12 GBP, now for [B]only 9 GBP (11 EUR)[/B] + postage.<br /> [B]20x 4164 chips[/B…
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  • Repalce 4164 RAM by 41464Dear all,<br /> <br /> I have some amount of 41464 DRAM from old PC VGA card which are useless at the moment. I think to keep them as a spare for the…
  • Free Faulty Original Sinclair ZX81 16k Ram expansionI bought this on ebay, was found to be faulty, when plugged in the screen froze and the "K" vanished. <br /> <br /> Thanks to a forum member I now h…
  • How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement.<br /> Know what I found? My old ZX Spectrum.... Those were the days!<…
  • Faulty Keyboard membraneHello,<br /> <br /> My keyboard membrane of the 48K doesn'nt work anymore,<br /> Does anybody know how to get a new one ?<br /> <br /> Thanks,<br /> …
  • just got three 'faulty' speccys...off of eBay - and found they all work :)<br /> <br /> I was geared up with schematics and soldering irons as well, half hoping to have to get the 'sc…

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