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<1…17181920212223…34>
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... basics, given you trust the RAM you have.

    First ... , check all RAM supplies are OK: The 4116 needed 3 supplies ... 6A clone has more modern RAM chips which only need +5 ...
    Marcelo Marcelo January 2007 Hardware
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... is it true that my tr4 and tr5 are in good working ...
    gorski gorski January 2007 Hardware
  • Best replacement for ZTX650?What is the best replacement transistor for the obsolete ZTX650? I've read that TIP31 will do the trick. Is there a decent equivalent from the BC or …

    ... the fault. First, remove all RAM chips from their sockets (I ... that carries power to the RAM chips). Replace the transistors, BA157s ... power up. If TR4 blows, it's not RAM causing the problem ... supply the lower 16K of RAM with three voltages, it's ...
    DEATH DEATH January 2007 Hardware
  • Keyboard Problem?Hey all. I'm Dave I'm in my last year of college before I go to University. I'm in the UK. I got a +2 a while back when I first told my mum and dad…

    ... /> ZTX450 transistors 25p
    4164/4116 RAM chips ?1
    Z80 processors ...
    DEATH DEATH February 2007 Hardware
  • Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…

    Does the +2 still have those awful 4116 DRAMs which have 4 power pins (+5v, -5v, +12v and GND)? Or by then were they using RAM that worked off a simple 5v supply?
    Winston Winston February 2007 Hardware
  • Did I killed my Speccy ???Hi guys, 1 minute ago I was working on my 128 +2A... But I made a mistake : I cut the gound on the PSU plug of the computer, and I forgot to resolde…

    ... repair so far (removing dead 4116) which is one project where ... voltages around the place. The RAM frying may have shorted and ...
    Winston Winston February 2007 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 …

    ... to get hold of 10 4116 RAM chips for a 48K Spectrum ...
    Steve(spt) Steve(spt) March 2007 Wanted
  • 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 …

    ... :

    "4116 - Dynamic RAM NMOS 16kx1 150nS 16-pin ... "

    or

    "4116 ... - Dynamic RAM NMOS 16kx1 200nS 16-pin ... also have "4164" (Dynamic RAM NMOS 64kx1) in versions from ...
    Pilsener Pilsener March 2007 Wanted
  • 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 …

    ... :

    "4116 - Dynamic RAM NMOS 16kx1 150nS 16-pin ... "

    or

    "4116 ... - Dynamic RAM NMOS 16kx1 200nS 16-pin ... also have "4164" (Dynamic RAM NMOS 64kx1) in versions from ...
    DEATH DEATH March 2007 Wanted
  • 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 …

    ... you can't find those RAM's any other place, then ... 're not cheap:

    4116 200 nS costs ? 3,50 ...
    4116 150 nS is ? 5,10 ...
    Pilsener Pilsener March 2007 Wanted
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... appropriate pins of the 4116 RAM (awful devices that require ... The pin out of the 4116 is here:
    [url ... also worth checking that RAM chips aren't getting ... which would indicate failed RAM rather than failed power ... out to be bad 4116 RAM, which seems to be ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... appropriate pins of the 4116 RAM (awful devices that require ... The pin out of the 4116 is here:
    [url ... also worth checking that RAM chips aren't getting ... which would indicate failed RAM rather than failed power ... out to be bad 4116 RAM, which seems to be ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... additionally - although my analogue electronics fu is not all that strong, looking at the schematics for an Issue 2 suggests that the power supply that generates some of the 'weird' voltages (+12v) is a switch mode power supply, which gets regulated by ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... , unfortunately!

    From the 4116 datasheet:

    [quote]
    4116 RAM with the +12/-5v supplies ... likely to fry your lower RAM! Hideous devices, these 4116s...not ... can be replaced with static RAM!
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... can be replaced with static RAM![/QUOTE]

    Mr ... just playing with veroboard and 4116 chips last week and ... order to "know that the RAM is good" before messing ... the whole of the bottom RAM block - and I think ... fit sockets and fit RAM I know to be good ...
    DEATH DEATH March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... pitfall, unfortunately!
    From the 4116 datasheet:
    Vbb is the ... +5v and GND to the 4116 RAM with the +12/-5v supplies ... can be replaced with static RAM![/quote][LIST]
    [*]Power ... supplies: Ok, lower RAM might fry with my *bright ...
    Marcelo Marcelo March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... for me is removing 8 4116 chips using a desoldering pump ... . Same goes for the upper RAM block too, the hot air ... available that runs using no RAM. Basically, you just remove the ... ROM. It goes through testing RAM as it goes, displaying on ...
    DEATH DEATH March 2007 Hardware
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    These days, use flash - don't bother with eprom. You can replace the ROM by making an external board that connects to the edge connector, and nails ROMCS high just like ZX Interface 2, so that the on-board ROM never gets selected. Simple decoding logic ...
    Winston Winston March 2007 Development
  • On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …

    ... voltages are right on lower RAM, the 4116s are not single ...

    Datasheet for the 4116 is here, so you can ...
    Winston Winston March 2007 Hardware
  • Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …

    ... this years ago before the 4116's decided to heat up ... /> I think it's upper ram, any other ideas guys? Am ...
    owdeuk owdeuk April 2007 Hardware
  • "Lost" 48K expansionToday I dug up my Speccy after more than 10yrs of inactivity. I bought it as a 16K in 1983, than I had expanded to 48K and never had problem. Until t…

    ... 32767) which consists of eight 4116 RAM chips, and upper memory, from ... computer has by testing the RAM, and evidently, on your machine ... byte of upper RAM) which indicates either upper RAM is not present ... chips for upper memory - each RAM chip is attached to a ...
    Winston Winston April 2007 Hardware
  • Spectrum 48K ROMHi Can anybody help I have an Issue 6a Circuit Board which has a faulty ROM Chip. Is it possible to program a ROM Chip with the 48K ROM and fit it as…

    ... the select pin, so the 4116 RAM sees the rising edge of ... has risen high and the 4116 has latched the row address ...
    Winston Winston April 2007 Hardware
  • 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…

    ... enough, I have some bad 4116 memory which the simple one ... to not need any working RAM at all (the board should ... the ROM and all the RAM - but not the ULA since ...
    Winston Winston April 2007 Hardware
  • RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…

    ... a RAM replacement board with modern SRAM for the Speccy, since 4116 ...
    Winston Winston April 2007 Hardware
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    ... real-world memory failures with 4116 RAM.

    One thing ... , say, 16384, all eight 4116 chips are selected, each one ... in my posession three failed 4116 memory chips from two Spectrums ... />
    In this final faulty 4116, the influence error is setting ...
    Winston Winston April 2007 Development
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... which I'd replaced the 4116 RAM and it caused me no ...
    Winston Winston April 2007 Hardware
  • BooHoo....Broken Speccy on 25th anniversary!Speccy broke today (today of all days!!) I'm presented with black screen on power up, anybody any ideas what might have gone wrong and any repair ti…

    Almost certainly a bad 4116 lower RAM chip.
    Winston Winston April 2007 Hardware
  • BooHoo....Broken Speccy on 25th anniversary!Speccy broke today (today of all days!!) I'm presented with black screen on power up, anybody any ideas what might have gone wrong and any repair ti…

    Almost certainly a bad 4116 lower RAM chip.

    Repair means ... desoldering all the 4116 chips, replacing ... good chips. Probably only one 4116 is actually bad. (My diagnostics ...
    Winston Winston April 2007 Hardware
  • Missing Voltage RegulatorHello all and a very merry 2-days-after-the-speccys-25th-birthday to you all! Okay, I've just received my brand spanking new 48K keyboard membranes …

    ... down BUT... this means the 4116 RAM will be supplied with -5v ...
    Winston Winston April 2007 Hardware
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... not sure.

    The tr4 transistor is a BC487 now ... ?
    Could it be a RAM chip that is ready to ...
    gtsamour gtsamour May 2007 Hardware
<1…17181920212223…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
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    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

HitBox

Word Docs Hits
ram 12.6K 21.4K
4116 933 1.4K
tr4 886 1.3K
tr5 555 806

Related Threads

  • 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…
  • Source of 4116 ramSomeone on eBay was selling 500 pieces of 4116 ram. The auction ended without bids, but he's willing to sell it in lots of 50 now. Someone in Spain a…
  • 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…
  • 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…
  • Help changing TR4 and TR5Hi all!<br /> Please, help me! :)<br /> I think I'm not understanding the correct pins of TR4/TR5 and the transistors.<br /> So, if anyone know the c…
  • 4116 Ram chip replacements?Hello. I am in the work of gathering replacement parts for my speccy 48k. And I would like to know what chips is good replacement for the 4116 ram ch…
  • 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…
  • 4116 Ceramic Ram ChipsHi all,<br /> <br /> I have a few 4116 Ceramic Ram Chips to sell.<br /> <br /> If you have any interest, please PM.<br /> <br /> Greetings,<br /> Ret…
  • TR4 or TR5?My issue two gives horizontal bars on bootup. Flicking reset takes it to copyright screen though. I measured voltages and got 4,9V, 11,99V and -4,3V.…
  • 65x used but tested and working 4116 RAM chipsFor any repairman: 65x 4116 chips, used but tested and working.<br /> Different brands, but ITT and STC mainly.<br /> <br /> ?25 + postage.<br /> <br…

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