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Search Again :: Adv Search 1000 results in 0.009s
<1…12131415161718…34>
  • 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…

    ... found a dealer for the 4116 chips, the nice people ... the 4116 chips with 4164 and since the upper RAM was ... broken 4116. Then I took out one of the upper RAM ... to slip into the empty 4116 socket.

    ... sockets for the upper RAM were the cheap kind and ...
    deckard deckard April 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... all present at the lower RAM ICs (the 8 in a ... lower left). I put the 4116 pin numbers in brackets after ...
    Zorn Zorn May 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…

    ... lower RAM fault. Are all the supply voltages present at the 4116 ...
    Zorn Zorn May 2012 Hardware
  • Lot's of Sinclair parts and sparesI have really a lot spares at home, like: - ULA's - All kinds of RAM chips Many of these parts have already been tested. Most of these parts are pu…

    Prices:

    - Ram chips (4116 / 4164, etc)
    - ZTX651 (replacement ...
    bverstee bverstee May 2012 Sales
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    TR4 getting blown might also indicate something is drawing too much current external to the power supply circuit (faulty 4116 RAM perhaps, or a short somewhere?)
    Winston Winston June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... the power supply circuit (faulty 4116 RAM perhaps, or a short somewhere ... blew on this spectrum. Then 4116 went. I replaced 7805 and ... 4116, and ran it for a ...
    Johan1973 Johan1973 June 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... . 7805 Blow
    2. 4116's (lower ram) go bad
    2 ...
    Johan1973 Johan1973 June 2012 Hardware
  • 4116 replaced by 4164 - "Noisy" paper?After I replaced my 4116's with 4164's and hooked them up to +5V, disconnected -5V and +12V, I have what looks like vertical lines in the paper, like…

    ... 4164 memory compared to the 4116. Similar kinds of "interference" can ... be able to read lower RAM at the same time that ... the CPU was using upper RAM - because using resistors was way ...
    Winston Winston June 2012 Hardware
  • Using an ATX power supply - Spectrum 48kOK... I have an Issue 3 48K model and the DC-DC converter does not work and I can?t make it work. :( There is a MOD to use an ATX power supply on the…

    ... circuit goes, often the lower ram gets fried too. Which is ... tracks that goes to the 4116 (the -5V and +12V) to ...
    Turrican Turrican June 2012 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    Well then this might be a good time to re-insert [B]known working[/B] RAM chips, for example using 4164 type to replace the 4116's.
    RetroTechie RetroTechie August 2012 Hardware
  • Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…

    Hi Tim,

    Will be nice to meet the competition in person. :P I'll be there Saturday, but won't be with games, just a soldering iron lots of 4116 RAM chips probably....
    Spirantho Spirantho August 2012 Sinclair Miscellaneous
  • Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…

    ... a soldering iron lots of 4116 RAM chips probably....[/QUOTE]

    RoCkRaBiLiA RoCkRaBiLiA August 2012 Sinclair Miscellaneous
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... snoop the bytes coming from RAM - sometimes it would see them ... be even less reliable than 4116...yet another 4164 has developed ...
    Winston Winston August 2012 Sinclair Miscellaneous
  • Spectrum 128 toaster and divide incompatibility problems with some demos and games.Okay so I got this thing now. It?s my first Spectrum ever. [img]http://img836.imageshack.us/img836/2016/speccyl.jpg[/img] [url]http://img824.image…

    ... snoop the bytes coming from RAM - sometimes it would see them ... be even less reliable than 4116...yet another 4164 has developed ...
    ingo ingo August 2012 Sinclair Miscellaneous
  • Replacing ZTX650 with BD139Today I blew up one of the GALs on one of my DivIDEs while testing on my Toastrack. Shorted M1 with 12V and the 12V circuit broke. I had to replace T…

    ... so does the 4116 memory modules for lower ram. Which is why ...
    Johan1973 Johan1973 September 2012 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... , place to check is on 4116 RAM IC's in lower left ... ; shows image (which needs lower RAM + video encoder to work), but ... for this). 3) Run more RAM software tests to determine if ... in place of the upper RAM.

    Watch ESD precautions ...
    RetroTechie RetroTechie October 2012 Hardware
  • Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…

    4116 chips were the most cost ... way to provide 16k of RAM when the Spectrum was ... designed (the 16k RAM pack for the ZX81 used ... />
    The higher capacity 64k RAM chips were much more expensive ... then the whole of the RAM would have suffered memory ...
    1024MAK 1024MAK October 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... -5 and +12V on the 4116 RAM bank.
    Falco-F8L Falco-F8L October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... i 200ns.
    Well, then RAM speed is not advantage here ... not all ZXes have 150ns 4116 chips. The trick has to ...
    kpuchatek kpuchatek October 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... likely the lower 16K of RAM that has failed. Having ... supply voltage to the lower RAM, make sure all voltages ... from radiated heat, but the RAM should not.

    RAM, remove all the chips, ... you'll need extra 4116 chips at this stage!)
    Winston Winston November 2012 Hardware
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... the odd voltages the 4116 memory needs is not ... to the lower 16K RAM. Look up the TMS4116 ... -5v) the lower 16K RAM is definitely dead. You'll ... power supply before replacing the RAM though. (You can search ... present, the lower 16K RAM is probably still bad, ...
    Winston Winston January 2013 Hardware
  • ZX SPECTRUM 48K color problemsHello, I am asking for your help... I found a ZX spectrum in a garage of a friend. He gave it to me telling that it didn't work. To say the truth it…

    ... all supply voltages? At a 4116 RAM chip, and at the LM1889 ...
    RetroTechie RetroTechie February 2013 Hardware
  • Difference between brands of 4164 chips?I have gotten my hands on a batch of several brands of 4164 chips. Examples are NEC D4164C-3 and Mitsubishi M5K4164ANP-15. Anyone knows if any type …

    ... I use these as a 4116 (lower RAM) substitute.
    They seem ... /> I just checked the Mostek 4116 datasheet and it also needs ...
    Knik Knik February 2013 Hardware
  • Difference between brands of 4164 chips?I have gotten my hands on a batch of several brands of 4164 chips. Examples are NEC D4164C-3 and Mitsubishi M5K4164ANP-15. Anyone knows if any type …

    ... . For one, because of the 4116's multiple power supply issues ... "find alternative for the RAM". Not that RAM or ROM will ever ...
    RetroTechie RetroTechie February 2013 Hardware
  • Difference between brands of 4164 chips?I have gotten my hands on a batch of several brands of 4164 chips. Examples are NEC D4164C-3 and Mitsubishi M5K4164ANP-15. Anyone knows if any type …

    I received some NEC D4164C-3 from Ben.
    I tested them and they work fine as upper (32K) RAM replacements in my Spectrums.

    I'll test them as 4116 lower (16K) RAM replacements on my memory adapter pcbs this week and let you know the result.
    Knik Knik February 2013 Hardware
  • Difference between brands of 4164 chips?I have gotten my hands on a batch of several brands of 4164 chips. Examples are NEC D4164C-3 and Mitsubishi M5K4164ANP-15. Anyone knows if any type …

    Tested the NEC D4164C-3 as 4116 lower (16K) RAM replacements on my memory adapter pcbs and they work just fine.
    Knik Knik February 2013 Hardware
  • Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …

    ... right about the problem being RAM.

    Ran a test ... />
    and have followed the RAM test procedures section. The result ... to have to find some 4116 equivalents and go the process ...
    junosix junosix April 2013 Hardware
  • 48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…

    ... is often caused by failed 4116 RAM chips that make up the ... to source another ULA or 4116 RAM chips, I'd verify that ...
    JeffB JeffB April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... should be present at the 4116 RAM chips for example.

    RAM chips.

    When you ...
    RetroTechie RetroTechie April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... screen. I removed the upper RAM and interface chips so that ... again:

    - Quit upper ram
    - Power on.
    - Check ... +5v, +12v, -5v in lower ram.
    - If spectrum doesn't ... />
    - Check data bus from 4116 and ULA.

    - Check ...
    Jose_Leandro Jose_Leandro April 2013 Hardware
<1…12131415161718…34>

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HitBox

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4116 933 1.4K

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