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Search Again :: Adv Search 1000 results in 0.011s
<1…14151617181920…34>
  • Spectrum +2 No TV PictureHi, As a retro collector in Australia I thought it was time to check out a real Spectrum as they were never popular here. So I bought the Spectrum +…

    ... got a row of 8 4164's separated by a row ... then another row of 8 4164's. So I'm pretty ... may help me fix the faulty one. But I'm determined ...
    romnutz romnutz 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 ...
    DEATH DEATH February 2007 Hardware
  • Spritual successor to the Speccy1988-1995 - Atari ST/STe/Falcon 1995-2000 - ? hmmm ? 2000-2006 - Playstation 2 with a keyboard 2007- ?

    ... />
    Either your memory is faulty, or I wasted a lot ... not dealing with 48K of RAM, 15 available colours and a ...
    rich_chandler rich_chandler February 2007 Sinclair Miscellaneous
  • 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…

    ... highly indicitave of them being faulty.

    NOTE - they ... equipment.

    NEw RAM chips can be got off ... t just solder in the RAM) and then fit the ... new RAM chips. Power up and ... to initialise a 32K upper RAM block :( Day three at ...
    DEATH DEATH 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…

    ...
    [QUOTE=DEATH;172500]4464 RAM chips mnore than likely. Hot ... highly indicitave of them being faulty.

    NOTE - ... .

    NEw RAM chips can be got off ... just solder in the RAM) and then fit the ... new RAM chips. Power up and ...
    bugpat bugpat 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 …

    ... these:

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

    "4116 - Dynamic RAM NMOS 16kx1 200nS 16-pin ... />
    They 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 …

    ... these:

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

    "4116 - Dynamic RAM NMOS 16kx1 200nS 16-pin ... />
    They 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 ... nS is ? 5,10
    4164 cost from ? 3,85 to ...
    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 …

    ... test and replace lower RAM. The RAM can be sort of tested ... chip body and measuring the resistance through the chip to ... /> test and replace the upper RAM. Same procedure - remove, socket, ... replace with known good RAM, test removed RAM.

    Test ...
    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…

    ... test and replace lower RAM. The RAM can be sort of tested ... chip body and measuring the resistance through the chip to ... /> test and replace the upper RAM. Same procedure - remove, socket, ... replace with known good RAM, test removed RAM.

    Test ...
    DEATH DEATH March 2007 Hardware
  • Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…

    [QUOTE=chop983;177347]I'd like to see 32k Ram Pack emulation while in 16k mode[/QUOTE]
    Oh, and I want to see faulty upper RAM emulation for the 48K model...

    Si
    obo obo March 2007 Emulators
  • Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…

    [QUOTE=obo;177352]Oh, and I want to see faulty upper RAM emulation for the 48K model...

    Si[/QUOTE]

    How about dodgy power supply emulation whilst we're at it?
    Matt_B Matt_B March 2007 Emulators
  • 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
  • What's the most probable......cause for this on a grey +2? (z80 is excluded) [url]http://img376.imageshack.us/img376/8087/plus2hk9.jpg[/url]

    ... , and it has far fewer RAM chips than a 48K machine ... + 2 who has 16 X 4164 (ICs 17--->32).
    bugpat bugpat March 2007 Hardware
  • What's the most probable......cause for this on a grey +2? (z80 is excluded) [url]http://img376.imageshack.us/img376/8087/plus2hk9.jpg[/url]

    ... , and it has far fewer RAM chips than a 48K machine ... />
    You're right, the RAM in a +2a/3 is ... simply "not used" on a 4164 chip, I assume it's ...
    DEATH DEATH March 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…

    ... Circuit Board which has a faulty ROM Chip. Is it possible ... these links may be the RAM chip type selection jumpers, but ... -jumpers. One deals with the RAM type ( they were usually TI ...
    Marcelo Marcelo 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…

    ... I've found out about faulty M1 lines, I'm making ... 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…

    ... 'm thinking of making a RAM replacement board with modern SRAM ... the Speccy, since 4116 and 4164 chips are getting harder to ...
    Winston Winston April 2007 Hardware
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    ... -world memory failures with 4116 RAM.

    One thing to ... .).

    In this final faulty 4116, the influence error is ... (this could be caused by faulty row/column address selection in ...
    Winston Winston April 2007 Development
  • Personal Gaming History in (very) Brief'79:PrinztronicMicro5500 --> '80:PlayedCoinOp(Space Invaders) --> '83:Spectrum(48K) --> '84:Spectrum+(kit) --> '86:Spectrum128 --> '88:AtariST --> '9…

    ... ones retrun as it was faulty.
    December 1984 - Third Rubber ... Paid £75 for 4mb of RAM.

    1994-2007 continually ...
    murtceps murtceps April 2007 Games
  • 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…

    ... the power cirquit could be faulty ?(the Zener for example). I ... ?
    Could it be a RAM chip that is ready to ...
    gtsamour gtsamour May 2007 Hardware
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... /+5v supply at the 4116 RAM is a convenient place to ... .

    Incidentally, on bad RAM, don't bet on flashing ... 't forget that the 4116 RAM is arranged such that there ... copyright message. All of the faulty 4116 chips in my collection ...
    Winston Winston May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... remove ROM from the circuit, resistance rises significantly, so it looks ... />
    [QUOTE]Since the 4116 RAM would have likely been damaged ... would desolder all the 4116 RAM and put them in ... be fully functional and lower RAM can be completely goosed.[/QUOTE ...
    Avian Avian May 2007 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... 's because of a faulty 16K expension RAM pack. The ZX81 randonly ... an decoupling capacitor inside the RAM expension pack and "miracle" no ...
    Gods Gods June 2007 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... am after a 48K spectrum RAM chip: [B]TMS4532-4[/B ... are 64kx4, 4532s are half-faulty 64kx1s).

    The only ...
    Phu Phu June 2007 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... threshold is for the upper RAM... if it's TTL levels ... CMOS version, since the 'on' resistance of the PMOS transistors is ...
    Winston Winston June 2007 Hardware
  • Spectrum ULAHi new to forum ,and have been a speccy owner/fan since the begining{like most 30 somthins on this forum !) Anyway what i want to know is the ULA th…

    ... the upper 32K block of RAM and some of the multiplex ... a problem with the upper RAM. One or more of the ... of the memory chips is faulty the next ones in line ... banks, a high block of RAM and a low block of ... RAM. The chips are actually 64 ...
    DEATH DEATH July 2007 Hardware
  • Spectrum ULAHi new to forum ,and have been a speccy owner/fan since the begining{like most 30 somthins on this forum !) Anyway what i want to know is the ULA th…

    ... that there's a faulty 4116 (lower 16K RAM) chip. Occasionally, it ...
    Winston Winston July 2007 Hardware
  • Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…

    ... certainly the lower 4116 RAM. The ULA normally gets ... does so because the lower RAM went bad.

    RAM. Refer to the diagram ... changing out the 4116 RAM. You'll probably find ... below) - for example, faulty output stages (so the chip ...
    Winston Winston July 2007 Hardware
  • Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…

    Just had a look at the old style C64 diagram the RAM chips in those are 4164.
    swift240 swift240 July 2007 Hardware
<1…14151617181920…34>

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HitBox

Word Docs Hits
faulty 2.3K 2.8K
ram 12.6K 21.4K
4164 377 528
resistance 1.5K 1.8K

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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