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  • Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…

    ... test quite a lot of RAM at work, and sometimes it ... up.

    Re: faulty speccy RAM, I've experienced it, and ...
    Digital Prawn Digital Prawn August 2007 Sinclair Miscellaneous
  • Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…

    ... is usually just an intermittently faulty chip. It'll work for ... idiot tried a ZX-81 RAM pack on it - after which ... idiot with the ZX-81 RAM pack was me by the ...
    Winston Winston August 2007 Sinclair Miscellaneous
  • Got my mac mini and I'm in loveI have had it for about 2 days now and it is the 2nd best piece of computer equipment i have had, it is quieter then my dvd HD recorder i have been s…

    ... power supply that's gone faulty. Sometimes they go bang, and ... out was one stick of RAM, so I'm down to ...
    The Starglider The Starglider September 2007 Chit chat
  • Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…

    ... upper 32K RAM since one of the chips was faulty) and 2 ...
    Winston Winston September 2007 Hardware
  • Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…

    ... upper 32K RAM since one of the chips was faulty) and 2 ...
    +2MAN +2MAN October 2007 Hardware
  • Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…

    ... /> Getting hold of some dynamic ram for my harlequin/ULA replacement ... . It's possible to use 4164 in place of the 4116 ... a daughter board for lower RAM that uses easier to get ...
    DEATH DEATH October 2007 Hardware
  • speccy 128 problemsHi everyone, first post on here, so first better say hello..hello :) Anyhow I just recently got back into gaming so a Speccy seemed just the thing t…

    ... doubt it could be the RAM because the +2a has a ... something similar) to indicate the faulty memory bank. If it gets ...
    gtsamour gtsamour November 2007 Hardware
  • 4116 and 4164 chipsI've just found the following supplier for 4116 and 4164 RAM chips. about $0.80 each.. not bad. [url]http://www.jameco.com/[/url] It's a US site. I…

    Good news.
    I tried searching for the chips on the site but got a bit lost.

    Do they do the TMS RAM chips?
    I have a faulty TMS4532-15NL4 chip. All my BIT 6's in upper ram are pulled high!
    BloodBaz BloodBaz November 2007 Hardware
  • A question about HTML.Why did the W3C depreciate the align attribute of the <DIV> tag. What replaces it? Is alighnment purely at CSS level now. Scottie_UK.

    ... to me. But my lower ram is faulty. :D )
    dekh dekh November 2007 Chit chat
  • Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…

    ... which exact ic's are faulty?
    I have the components ... indicates that *none* of lower RAM is working - check the +5 ... GND connections to the 4116 RAM first. It wouldn't be ...
    Winston Winston November 2007 Sinclair Miscellaneous
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... entirely possible that the RAM controller chips are faulty in that place ... . A speccy with no low ram, or low ram ... patterns when it boots. Low ram faults often cause the black ...
    Womble Womble November 2007 Hardware
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... feed is ok. Just cos RAM seems to be ok, don ... bit map location, and the RAM test in the ROM only ... that too....

    The RAM has to be ok, at ... and haven't encountered a faulty memory controller chip, not even ...
    gtsamour gtsamour November 2007 Hardware
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... that too....

    The RAM has to be ok, at ... and haven't encountered a faulty memory controller chip, not even ... do you think control the RAM on a grey +2? If ...
    DEATH DEATH November 2007 Hardware
  • Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…

    ... memory tester for testing upper RAM for data bit errors and ... . I think this suggests a faulty A13 line but it would ...
    BloodBaz BloodBaz January 2008 Hardware
  • Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…

    ... memory tester for testing upper RAM for data bit errors and ... . I think this suggests a faulty A13 line but it would ...
    Marcelo Marcelo January 2008 Hardware
  • DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …

    ... 're already using more modern ram dimms instead of the old ... Spectrum ram chips. I don't remember ... remember a toast 128K with 4164-20 that it didn't ... start if you put 4164-12 ( I changed all the ...
    Jose_Leandro Jose_Leandro January 2008 Hardware
  • Faulty M1 LineHello, I've got a new DivIDE but it's not working with my Spectrum 48k+. I've got a sneaking suspicion that it's a faulty M1 line. Is there any way …

    ... we did to remove a faulty upper RAM chip. Only ever done ... case of:
    a) Remove faulty chip by snipping pins with ...
    BloodBaz BloodBaz February 2008 Hardware
  • sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …

    ... . I wouldn't replace these RAM chips until the power circuit ... chips with half of the RAM faulty making 32Kx8. As you are ...
    Phu Phu February 2008 Hardware
  • sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …

    ... 3720-20 and 4164 chips. if you put 4164 chip, you ... don't need to change the ram ... / 4532 / etc 32Kx1 ram chips were 4164 chips with a broken ... 32K bank. The ram jumper ... H).

    Like 4164 is 64kx1 chips, it'll ...
    Jose_Leandro Jose_Leandro February 2008 Hardware
  • sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …

    ... this bus to access the ram . You don't know if ... stupid test. Remove all the 4164 ram and switch on the spectrum ...
    Jose_Leandro Jose_Leandro February 2008 Hardware
  • Anyone after 4164s...If anyone's after 4164 RAM... ... I'm in Houston at the moment, and EPO has some 4164 RAM in the shop, 100, 150 and 200ns variety, for $1 each. If …

    ... ;246135]If anyone's after 4164 RAM...
    ... I'm in Houston ... moment, and EPO has some 4164 RAM in the shop, 100, 150 ...
    Marcelo Marcelo February 2008 Hardware
  • 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
  • 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
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  • 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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  • 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 /> …
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