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<1…16171819202122…34>
  • 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 …

    ... one of the first three RAM chips (presumably they go up ... is the first 16Kb of RAM, 16384-18432, IC7 the second ... half of the screen - which RAM chip would this correspond to ... that more chips could be faulty?
    Muzer Muzer November 2009 Hardware
  • 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 …

    ... working OK (and perhaps a faulty chip is just loading it ... available on all the 4116 RAM chips. If -5v is missing ... ) are all in the 4116 RAM. Every address uses every 4116 ...
    Winston Winston November 2009 Hardware
  • 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 …

    I cannot find a -5V on any of the RAM chip pins. Should I just give up now then? (I'm only really a noob at electronics, I expected only one chip to be faulty).
    Muzer Muzer November 2009 Hardware
  • faulty zxspectrum +hi all i just bought a speccy 48k+ off ebay it worked for like 15 mins now it is stuck on the reset screen. I fear this is something major maybe fau…

    I'd still put money on it being lower RAM. (I've replaced plenty of faulty lower RAM chips, but never found a hot one).
    Winston Winston December 2009 Hardware
  • faulty zxspectrum +hi all i just bought a speccy 48k+ off ebay it worked for like 15 mins now it is stuck on the reset screen. I fear this is something major maybe fau…

    ... being lower RAM. (I've replaced plenty of faulty lower RAM chips, but ...
    rustyredline rustyredline December 2009 Hardware
  • PC freezes during first 10 minutesStarting about a week ago, my PC (Windows XP) randomly completely freezes in the first few minutes after I've turned it on. I bought it near the end …

    ... might have to relocate the RAM, as many motherboards need the ... first RAM stick in a certain slot ... the motherboard could be intermittently faulty, but a genuine memory error ...
    ewgf ewgf December 2009 Chit chat
  • Test single ram chips?Is it possible to test single ram chips? Micky

    [QUOTE=Mad Fritz;413150]Yes, depending on what you would like to test.[/QUOTE]I like to know is the ram ok or faulty.


    Micky
    -Micky -Micky January 2010 Hardware
  • Looking for some 48k RAM (upper 32k bank)Greetings, I was wondering where I could find some upper RAM for a 48k (issue 4A). It's the Texas Instruments TMS4532-20NL4 P8419 (or any compatib…

    ... where I could buy the 4164 DRAM chips?

    Also ... are multiple speeds for the 4164 chips (100ns, 200ns, 300ns..) Wondering ... the closest to the OEM RAM.

    Anyone have any ... why some of these upper RAM would just fail?

    thomas3120 thomas3120 February 2010 Hardware
  • Looking for some 48k RAM (upper 32k bank)Greetings, I was wondering where I could find some upper RAM for a 48k (issue 4A). It's the Texas Instruments TMS4532-20NL4 P8419 (or any compatib…

    ... where I could buy the 4164 DRAM chips?[/quote]
    ... are multiple speeds for the 4164 chips (100ns, 200ns, 300ns..) Wondering ... CAS delay generated by the RAM managing logic may not be ... fail?[/quote]
    Those RAM are actually 4164 RAM's with a defective ...
    mcleod_ideafix mcleod_ideafix February 2010 Hardware
  • Looking for some 48k RAM (upper 32k bank)Greetings, I was wondering where I could find some upper RAM for a 48k (issue 4A). It's the Texas Instruments TMS4532-20NL4 P8419 (or any compatib…

    ... any existing upper 32K RAM chips (=pull 4164's from their sockets ...
    RetroTechie RetroTechie February 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    So I guess the RAM is faulty ?

    [B]From ... fault could lie in the RAM. If the computer is ... machine the 32k of expansion RAM can be isolated. An ... fault condition, the expansion RAM will have to be further ... />
    If the ram is faulty and if I cut the ...
    gibs gibs March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... ;431155]
    If the ram is faulty and if I cut the ... fault is in the upper RAM bank (the 32K bank).
    RAM bank (the 16K bank).
    Lower RAM cannot be disabled, as the ... often a sign of a faulty chip.
    Or you ...
    Pilsener Pilsener March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... ROM or the Z80 is faulty.

    If the border ... upper 32K: if faulty, it usually means bad RAM locations, which reduce ... the Spectrums available RAM but shouldn't prevent it ... />
    [QUOTE]If the ram is faulty and if I cut the ...
    RetroTechie RetroTechie March 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... the first 16 K of RAM. In this case, you'll ... 4116 with 4516 or, better, 4164.

    Eventually, you'll ...
    Valentin Valentin April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... the first 16 K of RAM. In this case, you'll ... 4116 with 4516 or, better, 4164.[/QUOTE]I have changed the ... to 4164 rams. They only need +5 volt. The upper ram I ... changed with one 32K ram.

    -Micky -Micky April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... to 4164 rams. They only need +5 volt. The upper ram I ... changed with one 32K ram.

    4164 RAMs. They can be installed ... the PCB? What 32 K RAM have you used?
    Valentin Valentin April 2010 Hardware
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... well, you used only two 4164 RAMs. They can be installed ... K RAM have you used?[/QUOTE]No, I use 8 4164 rams ... for the lower ram instead 8 4116 ... .

    The 34k ram is a NEC D43256BCZ-70LL ... . It is for the upper ram.


    ...
    -Micky -Micky April 2010 Hardware
  • ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…

    ... post I assume the upper RAM chips aren't socketed? In ... always a prime suspect (especially RAM, sometimes ROM), but could also ... ), or an ULA that's faulty but not completely dead. Let ... 's hope disabling the upper RAM provides some clues...
    RetroTechie RetroTechie July 2010 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…

    ... known is that Sinclair used faulty 64Kbit chips to implement the ... third 16K page, so the RAM test that the ROM performs ... , but the CPU which proved faulty.

    But, above all ... responsible of bit 0 is faulty, the screen displayed is like ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…

    ... there be the possibility of faulty operation because of pressing the ... other systems out of MB ram 0 ! Also BS-DOS and ... always to master system in ram 0 ( can be BS-DOS ...
    velesoft velesoft September 2010 Hardware
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    For this, static RAM is better: it draws less ... not as vulnerable as dynamic RAM. Besides, as he says, all ... find 4116 chips, I use 4164 memories. It's not common ... one or two chips damaged. 4164 chips, on the other hand ...
    mcleod_ideafix mcleod_ideafix September 2010 Sinclair Miscellaneous
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... i.e. which chip- is faulty).

    Is ... have contains a lower RAM region (16K) which ... bank, and an upper RAM region (32K) which belongs ... /> If the non-contended RAM is damaged, the machine can ...
    If the contended RAM is damaged, the computer hangs ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... order do I replace the Ram IC's

    as ... determine which memory chips are faulty. If you can do the ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... it. You've found the faulty chip. If want to be ... properly, because a faulty RAS/CAS circuit inside the RAM, or the ... the data pins of your faulty memory chip are not floating ... , then, with time, the faulty memory chip might damage your ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... it. You've found the faulty chip. If want to be ... a possible failure mode for RAM chip and/or circuit board ... is enough to declare a RAM chip failure. Since in order ...
    RetroTechie RetroTechie October 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... have 48K machine with working RAM. I also loaded Manic Miner ... I'm going to take faulty IC15 out and solder new ...
    lillaolle64 lillaolle64 October 2010 Hardware
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    ... this schematic to spot a faulty memory chip on a +2A ... missed the fact that the RAM was ambiguous and the labels ... labels back in for the RAM chips. New schematic at the ...
    guesser guesser October 2010 Hardware
  • divide deviceHi, This is first my first post,so hello to you all I first Spectrum 48k was a Xmas present way back in 1983,best gift ever. Then I moved on to a C…

    ... and 512KB of battery backed RAM.
    Unfortunately a dirty edge ... + or if the DivIDE+ was faulty. If you want to use ... to dirty edge connector or faulty M1 on Z80 CPU.
    Alien 8 Alien 8 November 2010 Hardware
  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... of the RAM chips that I removed becuase they where faulty and ... this board.


    RAM Replaced:

    [IMG]http ... .com/albums/l426/hedge1970/Spectrum/Ram.jpg[/IMG]

    Image ...
    hedge hedge November 2010 Hardware
  • How to clean up video output to TFT LCD - Spectrum 48kHi, I hope that there is an easy answer to this question. I have modded the RF socket on my 48k Spectrum to output composite video as described in t…

    ... of the RAM chips that I removed becuase they where faulty and ...
    RetroTechie RetroTechie November 2010 Hardware
<1…16171819202122…34>

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  • 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 …
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