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Search Again :: Adv Search 1000 results in 0.011s
<1…17181920212223…34>
  • divIDE & Joystick interface / other peripheralsHi, Anyone on here with a divIDE, managed to get the divIDE to play nice with a Kempston joystick interface; specifically - a RAM Turbo joystick int…

    It doesn't though - maybe my RAM-Turbo has become faulty :-(
    The_Beard The_Beard August 2009 Hardware
  • divIDE & Joystick interface / other peripheralsHi, Anyone on here with a divIDE, managed to get the divIDE to play nice with a Kempston joystick interface; specifically - a RAM Turbo joystick int…

    ... t though - maybe my RAM-Turbo has become faulty :-([/QUOTE]

    RAM TURBO interface ? This connector ... you connect only ZX with RAM TURBO, then ZX work ... />
    For 100% parallel connection RAM TURBO + DIVIDE is better true ...
    velesoft velesoft August 2009 Hardware
  • Welcomes...and some technical stuffHello I`d like to welcome all ZX Fans. I`m rather ATARI 8bit geek - I got this grat machine when I was 14...20 yeras ago... There were few ZX in …

    ... the Spectrum video RAM bank so it uses 4164 chips instead of ... the available memory on the 4164, but this device uses only ... or DVD's). Besides, the 4164 is far more reliable than ...
    mcleod_ideafix mcleod_ideafix August 2009 Hardware
  • Welcomes...and some technical stuffHello I`d like to welcome all ZX Fans. I`m rather ATARI 8bit geek - I got this grat machine when I was 14...20 yeras ago... There were few ZX in …

    ... />
    ram chips have been changed to similar ones - 4164 instead 2 ... and -5V are used by RAM chips in first bank ??
    lotharek lotharek August 2009 Hardware
  • dead issue 6a boardI've just been back to the uk and found my old 48K + there - and bought it back with me to singapore - it's giving white border and red bars. From wh…

    ... image to the video RAM, so you can easily ... missing bit and hece, the faulty chip:
    [img]http ... first division.
    A faulty DRAM chip has often ... image must not use any RAM position. That is, ... no stack, no RAM variables, no interrupts.
    < ...
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    ... (does it mean all the RAM chip are damaged?)
    I ... try to see what RAM chip is faulty.
    BTW. I did ...
    xc8 xc8 September 2009 Hardware
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    ... ? I recall that when a RAM error is found, the processor ... border color according to the faulty bank, but it does not ...
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    It is possible that bad RAM causes this problem: the Spectrum ... starts using RAM for the stack with the ... stage that there's faulty memory (or a faulty PCB trace/solder ...
    Winston Winston September 2009 Hardware
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    ... (of the dead +3) WAS FAULTY! When I put the old ... on the sockets only the RAM IC5 and IC6 I see ... on the sockets only the RAM IC3 and IC4 I see ... I ll get the new RAM ICs....


    Chris
    xc8 xc8 September 2009 Hardware
  • The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…

    ... "looks" like a very low resistance. This means reset out will ... , 0x3000 ; Clear down the fixed RAM page.
    ld de, 0x3001 ...
    Winston Winston September 2009 Development
  • Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…

    ... speccy is AFAIK unloaded as 4164 ram ONLY uses a +5 supply ...
    nuggetreggae nuggetreggae October 2009 Hardware
  • Demos that made you buy the gameAnyone remember the 1-level demo from R-type? I can still remember my friend and I being blown away buy how colourful and smooth it all was. That gam…

    ... you actually got a Midnight Resistance cab? Or just boards?[/QUOTE ... still have 3, I repair faulty arcade pcbs ya see.
    Womble Womble October 2009 Games
  • 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
  • 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 …

    ... AC and DC. The internal resistance of the multimeter is very ... all other measurements the internal resistance if the multimeter is very ... Ohm, and then the added resistance of the multimeter (1 Ohm ... br /> Without -5V the lower RAM will 'depart' very soon, getting ...
    roko roko 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
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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

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