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<1…13141516171819…34>
  • 48k fuzzy screen errorHi all, I just got a ZX Spectrum 48k (rubber keys) from eBay and when I plug it in the main screen on the TV is all fuzzy and garbled in the middle.…

    ... what happens when the lower RAM is completely broken or missing ... circle of failure with the 4116 RAM ICs. Fortunately, it's probably ...
    Zorn Zorn 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…

    ... every connection in the 16K RAM bank with a good light ... in your case are the 4116 chips. If I were you ...
    Falco-F8L Falco-F8L April 2013 Hardware
  • Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…

    ... all the support TTL and RAM chips in my IC tester ... tester unfortunately cannot test the 4116 chip, so I resort again ... also de-solder all the 4116 chips on the faulty board ... with the suspect set of RAM chips, it means that one ...
    Pierre Pierre May 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... 48K Spectrum's have operational 4116 and work fine :smile:, but ... need of some "replacement 16K RAM" ;)

    [I][B]Mark ...
    1024MAK 1024MAK May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... three power supplies to the 4116 RAM chips (+5V, +12V and ... are not correct, the 4116 RAM chips will not work correctly ... plus it can damage the 4116 chips.

    ... that will test the RAM and tell you what ... bits of the RAM are faulty.

    1024MAK 1024MAK May 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    Hello. I have ordered some 4116 RAM and some sockets; I've ...
    Trafferth Trafferth June 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... and z80 with confidence, lower RAM with less. I suspect I ... of Zorn's replacement Lower RAM boards in the near future ... find 4116 150ns chips anywhere. However, none of the lower RAM chips ...
    Simon_Carr Simon_Carr June 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... find 4116 150ns chips anywhere. However, none of the lower RAM chips ... , the ULA, the ROM, the RAM combined that process keyboard inputs ...
    1024MAK 1024MAK June 2013 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    I didn't think of the potential expense regarding the ram replacements. Is there a cheaper/more available alternative than the 4116?

    J
    serene serene June 2013 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    ... .net/LRR"]ZX Spectrum lower RAM replacement module[/URL]. [URL="http ... be other faults, but overheating RAM ICs clearly suggests a problem ... the lower RAM's PCB pads - look up a 4116 datasheet or ... [/URL] that I made. The RAM replacement module only uses the ...
    Zorn Zorn June 2013 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    ... the replacement of the power RAM. It does not matter if ... you replace the current RAM with other 4116 chips or use the ... lower RAM replacement module, you still ...
    Pierre Pierre June 2013 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    ... the replacement of the power RAM. It does not matter if ... you replace the current RAM with other 4116 chips or use the ... lower RAM replacement module, you still ...
    serene serene June 2013 Hardware
  • 48k Rubber Key Spectrum ProblemI'm testing my mate's spectrum that hasn't been used since the late 80's. Unfortunately, it seems to keep randomly resetting itself (like pressing th…

    ... found that the lower 16K (4116 chips) sometimes need a few ... specs of the 4116 chips, but as the RAM matrix is just ...
    Pierre Pierre June 2013 Sinclair Miscellaneous
  • 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…

    ... faulty or no "lower" 16k 4116 DRAM image.
    This looks ... test each pin of each RAM chip socket to the pins ... with sockets other than the 4116 DRAM chips?

    [I ...
    1024MAK 1024MAK June 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... Voltages and connections for the RAM are all OK. Have ... tried the original RAM and a NOS set ...
    Have just ordered a 4116 lower memory replacement module from ... that's murdering the RAM we will be able ... to eliminate the RAM from the search for ...
    Trafferth Trafferth June 2013 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…

    ... ...

    I had some 4116 chips on order from the ... swapped this around the lower RAM sockets until I got a ... the damage here is one 4116 and a 6C001E-7 ULA ...
    balford balford June 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... -contended RAM (4532 chips) seem to be more reliable than 4116, have ... ago as a replacement for 4116 too, but with a standard ...
    mcleod_ideafix mcleod_ideafix July 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... -contended RAM (4532 chips) seem to be more reliable than 4116, have ... Spectrums that have upper RAM faults than lower RAM faults. Perhaps because ...
    Zorn Zorn July 2013 Hardware
  • Issue 2 black paper white borderGot an issue 2 here that has a 6c001e ULA, no cockroach, no transistor mod (although you can clearly see on the top of the z80 and on some legs, some…

    Thanks guys, the connections for the lower ram have been checked and double checked professionally, alls good down there, ive even put 8 known working 4116 ic's in to the same effect
    Macc Macc July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... of the 4116 chips for Zorn's excellent lower ram replacement module ... pins of the far right RAM chip with a bit of ...
    Trafferth Trafferth July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... am assuming that the lower RAM replacement module is OK.
    RAM and ROM removed you get ... pure white. With only the RAM removed you get a black ... some reason, with the good 4116 chips you get a stripey ...
    Trafferth Trafferth July 2013 Hardware
  • The right toolsAs i am going to pick up a hobby of fixing spectrums I wanted to know whats the right tools for the job. Like what wattage should the soldering iron …

    ... ) and some ZTX650's. 4116 and 4164 RAM chips would be good ...
    DEATH DEATH July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... display data from the lower RAM. I encountered many variations of ... it while developing the lower RAM replacement module. Are you using ... definitely good. I have 16x 4116 chips which I can test ... case for you! :) If the 4116 chips I have are no ...
    Trafferth Trafferth July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    Upper RAM, 4164 chips, get em from ... , but if you search "4164 RAM", you'll get several listings ... edit:

    Lower RAM are 4116 chips, same source (ebay)
    DEATH DEATH July 2013 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…

    ... interference following replacement of lower RAM with modified 4164's, and ... /> I'm using period correct 4116's, however on a whim ...
    balford balford July 2013 Hardware
  • The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…

    ... .

    Removed all lower RAM since it was soldered to ... in a handful of random 4116 chips and we have life ... I shall source some working 4116's and then see if ...
    DEATH DEATH August 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... be putting Zorn's replacement 4116 module back in and seeing ... if you swap the lower RAM chips around? This might help ... - I'm thinking that the 4116 in that column is out ... the lower RAM module, I'd find some new 4116's to ...
    balford balford August 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... have already tried permutating the 4116 chips around and the stripey ... another trace onto a specific ram data line... hmm....
    Trafferth Trafferth August 2013 Hardware
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    ... way to detect a bad RAM chip without using the ... beyond working out how much RAM you *probably* have!
    ... actually had a faulty RAM or ULA issue with ... a Dragon 32 with bad RAM.

    If ... it working, unsolder all the 4116 chips, replace them with ...
    RobeeeJay RobeeeJay August 2013 Hardware
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    ... up of two groups of RAM chips.
    The so ... called lower RAM (used for the screen so ... sometimes called the screen RAM) is made from eight ... of chip used is the 4116 DRAM. This type of DRAM ...
    The so called upper RAM also uses eight DRAM chips ...
    1024MAK 1024MAK August 2013 Hardware
<1…13141516171819…34>

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HitBox

Word Docs Hits
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