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<1…12131415161718…34>
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ? Speccy with a 16K sticker on the base. Doing a peek 23733 returns 255 so a 48K ? Opened …

    ... factory bodged to use OKI upper RAM (soldered in place), but I ...
    Zorn Zorn September 2013 Hardware
  • When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ? Speccy with a 16K sticker on the base. Doing a peek 23733 returns 255 so a 48K ? Opened …

    ... multiplexor connections to support OKI upper RAM. By default, the issue 2 ... only supportsTI RAM. It's all to do ... /showthread.php?t=44503#1"]upper RAM module[/URL].
    Zorn Zorn September 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... particular its interaction with the upper RAM.

    If the Spectrum ... discovered between it and the upper RAM module.

    If a ... , I will send them an upper RAM module. It would be good ...
    Zorn Zorn September 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... of them attempt to address upper RAM through hardware. They appear ... very unlikely to me the upper RAM module would interfere with ... capacitors) that disrupts the new upper RAM?

    It looks ... with a Spectrum with the upper RAM module; I use software ...
    Zorn Zorn September 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... of them attempt to address upper RAM through hardware. They appear ... very unlikely to me the upper RAM module would interfere with ... capacitors) that disrupts the new upper RAM?

    It looks ... with a Spectrum with the upper RAM module; I use software ...
    Dan Antohi Dan Antohi October 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... is what the "ZX Spectrum Upper RAM Module" plugs into. The module ... then supplies /RAS to the RAM).

    What chip is ...
    1024MAK 1024MAK October 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... is what the "ZX Spectrum Upper RAM Module" plugs into. The module ... then supplies /RAS to the RAM).

    What chip is ...
    Dan Antohi Dan Antohi October 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... think it is happening with Upper RAM module.
    kpuchatek kpuchatek October 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... in place of the usual upper RAM. If 4532s/4164s operate correctly ... must still be driving the upper RAM's control logic correctly. The ... generation of /RAS for the upper RAM. I'd be surprised if ... caused a problem for the upper RAM module. It uses a high ...
    Zorn Zorn October 2013 Hardware
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... think it is happening with Upper RAM module.[/QUOTE]

    Perhaps ... the problem is that the upper RAM module latches addresses more quickly ...
    Zorn Zorn October 2013 Hardware
  • Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…

    ... balford said, some of the upper RAM may pass the initial test ... almost impossible to diagnose an upper RAM fault without removing all of ...
    Zorn Zorn October 2013 Hardware
  • FREL Comcon Programmable Joystick Interface not working on 128k but on 48kAnother day, another problem :-) My FREL Comcon Programmable Joystick Interface [url]http://www.worldofspectrum.org/infoseekid.cgi?id=1000070[/url]…

    ... to multiplex the video RAM. The Z80, ROM, upper RAM and edge connector ... one side, and the lower RAM and the ULA are on ... multiplexing logic for the contended ram so the resistors are no ...
    guesser guesser October 2013 Hardware
  • Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…

    The original problem was fixed (upper RAM), the new issue is that im getting a black and white picture through composite
    Macc Macc October 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... typical pattern of a lower RAM failure any more.

    upper RAM area.

    You could ...
    balford balford October 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... typical pattern of a lower RAM failure any more.

    upper RAM area.

    You could ...
    Edge Edge October 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... /> How do I disable the upper ram? Cut tracks? Ill take a ...
    Edge Edge October 2013 Hardware
  • Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…

    ... normally appears when the lower Ram is broken or the 12V ... recognized that there is no Ram test using this Rom. Is ... price which works and has upper ram and may be address logic ...
    maskenlos maskenlos October 2013 Hardware
  • ZX Spectrum Plus Versions.Did they ever do a 16K version of the Spectrum Plus? I have just got an early one (Issue 3), with a low serial number 003-037776, and it is fully po…

    It is most likely a normal 48K Spectrum+ that has developed an upper RAM fault.

    You'll probably be able to work out which of the RAM ICs are faulty through a bit of poking and peeking.
    Zorn Zorn November 2013 Hardware
  • Power consumption improvementsHi all, Having just received lower and upper RAM replacement modules from Zorn, I thought I'd perform some current draw measurements to see how much…

    ... /> Having just received lower and upper RAM replacement modules from Zorn, I ...
    Falco-F8L Falco-F8L November 2013 Hardware
  • Power consumption improvementsHi all, Having just received lower and upper RAM replacement modules from Zorn, I thought I'd perform some current draw measurements to see how much…

    ... to do with the lower/upper RAM boards though, as others had ...
    balford balford November 2013 Hardware
  • Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…

    ... times) to indicate the lower ram failure
    - After that all ... me this means that all RAM chips are faulty which is ... - 26 and all upper Ram chips

    128K Ram test ROM
    maskenlos maskenlos November 2013 Hardware
  • Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…

    ... your Spectrum has some faulty upper RAM. Now you need to identify ... [/URL]


    Faulty upper RAM ICs can be replaced with ...
    Zorn Zorn December 2013 Hardware
  • 32K Expansion board for issue 1 SpectrumI realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently. Don't …

    ... also does one that does upper ram or did.. I was supposed ... sales bit for lower ram or low ram, or "sell my retro ...
    fog fog December 2013 Wanted
  • 32K Expansion board for issue 1 SpectrumI realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently. Don't …

    ... /> I have a lower and upper RAM module from Zorn in my ... issue 1 equivalent for the upper RAM but the likely market probably ...
    balford balford December 2013 Wanted
  • 32K Expansion board for issue 1 SpectrumI realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently. Don't …

    ask him about it for the upper ram, think that thread mentions it.. as I wanted it , but also one that I could disable.
    fog fog December 2013 Wanted
  • Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …

    ... several Spectrums, all with the upper RAM module installed. I haven't ... can be used with the upper RAM module.
    Zorn Zorn December 2013 Hardware
  • My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…

    ... , including Zorn's lower and upper RAM module replacements, a Recom regulator ...
    balford balford January 2014 Hardware
  • My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…

    ... , including Zorn's lower and upper RAM module replacements, a Recom regulator ...
    Hairy Hairy January 2014 Hardware
  • DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…

    ... expensive than the lower and upper RAM modules I'm already selling ...
    Zorn Zorn January 2014 Hardware
  • "Freezes" on program loadingHi! I have ZX Spectrum+ (Issue 6A), and recently it has started to freeze w/o returning an error (but keyboard works) on program loading, regardless …

    If the machine starts up ok, then I'd suspect an upper RAM fault.

    Can you please follow the steps given [URL="http://www.1000bit.it/support/manuali/sinclair/zxspectrum/sm/sec4_2.html#memchk"]here[/URL] and report back.

    B
    balford balford January 2014 Hardware
<1…12131415161718…34>

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HitBox

Word Docs Hits
upper 2.8K 3.7K
ram 12.6K 21.4K
16k 5.5K 7.7K

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