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Search Again :: Adv Search 1000 results in 0.011s
<1…16171819202122…34>
  • 2 Spectrum +3's need urgent helphi guys i have 2 spectrum +3's but both are not working properly, does any one know how to repair them i dont mind giving one away if they help me fi…

    I'd hazard a guess at bad memory (either a faulty ROM or bad RAM) for the second one.
    Winston Winston April 2008 Hardware
  • How tell what version spectrum you haveHello everyone. I have just been in my loft again and found even more sinclair stuff .Just going through a big box and i have found a boxed spectrum …

    type the command

    PRINT PEEK 23733

    For a 16K spectrum, the result will be 127

    For a 48K Spectrum, the result will be 255

    (Assuming the RAM isn't faulty!)
    Digital Prawn Digital Prawn May 2008 Hardware
  • Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…

    ... Anonymous;277491]Sinclair used faulty parts to save money, including ... Sinclair. I know about faulty 64K RAM chips, and it makes ... sense. But faulty line on CPU ... somemanufacturer took effort to separate faulty chips with specific error - ...
    piters piters June 2008 Hardware
  • Is it possible to use external power supply for +-12; +-5 for ZX SpectrumRecently I acquired a damaged Sinclair ZX Spectrum, issue 3B. According to the maintenance manual I have to replace TR4 and TR5. These type of transi…

    ... you had to fix the ram or psu switching circuit first ... /repair2/rep_spec.html[/url]
    Resistance between pin 1 of IC6 ... to the right of C4, resistance remained approx 5kOhm. Pin 8 ...
    65C02 65C02 June 2008 Hardware
  • Why's my PC BSOD?Righto, Windows XP Pro Corp SP3, haven't installed anything new lately, it's just started blue screening occasionally and resetting. Did a memtest, a…

    ... doubt that it would be RAM or CPU temp. normally the ... (no BSOD) if the RAM is faulty and freezes on high temps ...
    Vertigo Vertigo July 2008 Chit chat
  • Problem with Discovery OpusI've just got a Discovery Opus, but it seems to be faulty. When I connect the Speccy and switch it on, it displays the "C 1982 Sinclair Research", …

    ... yours have the optional 6116 RAM chip fitted? Mine does not ... does this help? (Ruling out faulty drive)

    Can you ... confirm PSU is not totally faulty)

    Finally, one "stab ...
    Jimmy Jimmy July 2008 Hardware
  • Black ScreenHi, Anyone know what would cause a 48k Spectrum to boot to a black screen? you can hear the internals buzzing at power up, but you just get a black…

    ... Typically if the ROM is faulty you'll either see ' ... br /> If the CPU is faulty (and simply not running at ... If the RAM is faulty, it depends how it's faulty. Since the ... 4116 RAM is only 1 ... Usually only 1 chip is faulty, and there's many ...
    Winston Winston September 2008 Hardware
  • Problem upgrading 16K SpectrumHello Spec-chums, I've been a long time Commodore user, but also a long-time Speccy admirer (and emulator user). I've recently got hold of a Issue 2…

    ... the chip in IC17 was faulty. I've replaced it, but ... worth just replacing all the RAM chips?
    Layden Layden October 2008 Hardware
  • Another badly behaved RAM upgradeI have a 48K issue 4A board (yellow it is) that was a 48K machine from new, but only reports 16K working with the Sinclair ZX Test ROM in an Int2. H…

    Is the ram chip you installed of same or smaller access time (the number 15 or 20 mean nanoseconds)?
    If you used one of larger access time then it should normaly behave as faulty. Had that problem when used a 25ns ram chip instead of 20ns.
    gtsamour gtsamour November 2008 Hardware
  • Another badly behaved RAM upgradeI have a 48K issue 4A board (yellow it is) that was a 48K machine from new, but only reports 16K working with the Sinclair ZX Test ROM in an Int2. H…

    The RAM in a 48k machine is ... that was the case, lower RAM would fail too. You could ... all the chips would look faulty during a random fill or ...
    Winston Winston November 2008 Hardware
  • A 64K Spectrum?? Is this real?I have seen avertised on Ebay today two boxed ZX Spetrum Rubber Keys. One 16K and the other a 64K upgraded model?? Is this for real??? [url]http://…

    Well, I repaired a Issue 2 Speccy putting 4164 chips on the upper memory, so I have a 80K RAM Speccy ;-)
    Hernán Pablo Álvarez Hernán Pablo Álvarez November 2008 Sinclair Miscellaneous
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... , detecting 16K or 48K of RAM available.

    Watch out ... previous version.
    Pseudo-random RAM filling test, with 16-bit ... indication of which bit is faulty.
    No 128K support.
    Digital Prawn Digital Prawn January 2009 Games
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... less trustworthy than the screen RAM that the program itself is ... />
    Also if that is faulty, then the program can go ...
    Digital Prawn Digital Prawn January 2009 Games
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ... going to knock together a RAM test routine today but my ... .2 of [b]16/48K RAM Tester[/b]:-

    [strike ... now shows each faulty BIT of the last faulty byte found (see ...
    Digital Prawn Digital Prawn January 2009 Games
  • Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …

    ...
    ;at least 48K of RAM

    JR NC, ...
    NoBitFade

    ;Blank RAM before printing message
    LD ... NotFaultyBit

    ;Bit is faulty
    LD (HL),C ;Load ... br /> String2Edit
    DB "48K RAM",0
    String3
    DB ...
    Digital Prawn Digital Prawn January 2009 Games
  • Help with faulty +2ahi everyone I'm Nuno from Portugal I think I made poopoo with a 128k +2a motherboard I had spare for testing purposes This motherboard has always …

    ... indeed, they could be faulty, but swopping the ROM ... />
    If your RAM is in sockets, try swopping ... changes - if so, RAM is most likely at fault ... You can get these RAM chips from old style ... br /> If you change your RAM chips, use sockets ;) They cost ...
    DEATH DEATH February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... one...bet it's lower RAM going faulty. This seems to be ...
    Winston Winston February 2009 Hardware
  • R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…

    ... one...bet it's lower RAM going faulty.
    .... swap chips that ... before (even try) swapping lower RAM!!!

    [QUOTE=Winston;334096 ...
    roko roko February 2009 Hardware
  • New Guy Wants Speccy - SWAP !Hi, I`m new here so here is a little background info ! I always had a C64 when I was in my teens in the 80`s, my friends had Spectrums, so it was alw…

    ... :D

    4116 RAM chips, 4164 upper RAM chips, any of the ...
    DEATH DEATH February 2009 Wanted
  • Keys don't work even with new membrane, HELP!Hi folks. I have a 1983 48k Zx Spectrum. It powers up fine, but none of the keys respond. I have tried fitting a new keyboard membrane from rwap, but…

    ... then there is a RAM problem as the RAM test failed. eg ... I GUESS that rules out faulty membrane or a bad solder ...
    spec09 spec09 February 2009 Hardware
  • Help with faulty +2ahi everyone I'm Nuno from Portugal I think I made poopoo with a 128k +2a motherboard I had spare for testing purposes This motherboard has always …

    ... .
    Basically after replacing 3 ram chips from a spanish 2a ... parts :) .
    They still have 4164 dram?s for the 48k ...
    PauloAlb PauloAlb March 2009 Hardware
  • issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…

    ... in you MUST increase the resistance of resistors R1 to R8 ... data coming from the lower RAM to the ULA. When the ...
    Phu Phu March 2009 Hardware
  • Spectrum+ - multiple issuesHi all Yesterday I picked up a Spectrum+ (via eBay) to add to my collection. Now, before any of the names I recognise from the last few months of l…

    ... membrane). Your upper 32K of RAM is also almost certainly bad ... test the upper 32K of RAM. You may need to run ... find out which chips are faulty depending on the failure mode ... failed chips easiest. Remember Spectrum RAM is one bit wide, not ...
    Winston Winston April 2009 Hardware
  • Spectrum+ - multiple issuesHi all Yesterday I picked up a Spectrum+ (via eBay) to add to my collection. Now, before any of the names I recognise from the last few months of l…

    ... it not to be the RAM after all :roll:

    faulty one with my Dad next ... the values read/written to RAM change intermittently then I'm ... mention it before but the faulty board is an Issue 2 ...
    szeliga szeliga April 2009 Hardware
  • What spec/age is your computer(s)?Not started a thread for a while so here goes. I have a Desktop Replacement Rock Direct Quaddra Ti 3.4Ghz machine which was 4 years old in January. …

    ... .5GB RAM
    80GB+250GB HDs
    ATI Radeon 9600Pro gfx (faulty ... "
    Sempron 3000+
    512MB RAM
    40GB/40GB/500GB/750GB ... /> Intel Celeron, 667Mhz
    512MB RAM
    40GB HD
    ATI ... /> Commodore Amiga A1200
    2MB RAM
    No HD

    Marko Marko May 2009 Chit chat
  • What spec/age is your computer(s)?Not started a thread for a while so here goes. I have a Desktop Replacement Rock Direct Quaddra Ti 3.4Ghz machine which was 4 years old in January. …

    ... /> AMD 64 3000+
    512MB RAM (Did buy 1GB of 'extra ... fast Ram - cept it turned out to be faulty, just took ...
    Collie Collie May 2009 Chit chat
  • zx81 help neededHi, I got a ZX81 today supposedly in working order, it was for the first two minutes, but after that the keyboard produces the wrong letter, number …

    ... TV picture)
    If the RAM was failing then it's ... .
    If the keyboard was faulty then your typed in program ...
    Jimmy Jimmy June 2009 Hardware
  • building a PCIv'e decided to get my old PC and try and get the thing working again. not really sure what went wrong with it, and instead of buying a new one i pre…

    ... - 1 Ghz Crucial CL2 PC133 RAM
    - ATI Radeon 8500 ... .

    PC133 RAM is a technology called SDRAM ... five years use DDR2 RAM; and the latest boards ... use DDR3 RAM.

    In ... replace whichever component is faulty. You'd normally do ...
    ajmoss ajmoss July 2009 Chit chat
  • Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …

    ... which gives supply to video RAM are faulty (can you hear a ... with a Spectrum with a faulty ROM chip.

    The ...
    mcleod_ideafix mcleod_ideafix July 2009 Hardware
  • Two dead SpectrumsHi all, Long time since I posted on here. I'm having a bit of a clear-out, and I've re-discovered two Spectrums I had in the loft : One is an orig…

    ... means the lower 16K of RAM is dead. 4116 memory seems ... - this will kill lower RAM too because lower RAM needs -5v supplying ... machine may also have a faulty internal power supply. No display ...
    Winston Winston August 2009 Hardware
<1…16171819202122…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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  • Repalce 4164 RAM by 41464Dear all,<br /> <br /> I have some amount of 41464 DRAM from old PC VGA card which are useless at the moment. I think to keep them as a spare for the…
  • Free Faulty Original Sinclair ZX81 16k Ram expansionI bought this on ebay, was found to be faulty, when plugged in the screen froze and the "K" vanished. <br /> <br /> Thanks to a forum member I now h…
  • How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement.<br /> Know what I found? My old ZX Spectrum.... Those were the days!<…
  • Faulty Keyboard membraneHello,<br /> <br /> My keyboard membrane of the 48K doesn'nt work anymore,<br /> Does anybody know how to get a new one ?<br /> <br /> Thanks,<br /> …
  • just got three 'faulty' speccys...off of eBay - and found they all work :)<br /> <br /> I was geared up with schematics and soldering irons as well, half hoping to have to get the 'sc…

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