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  • Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …

    ... I think replacing the faulty RAM will solve the problem.

    The RAM chips are responsible for dealing ... for the lower RAM and another two for the upper. The other ... generating control signals for the upper RAM.

    Also, once ...
    Zorn Zorn April 2013 Hardware
  • 128k Basic used much ?Hi - I was wondering if there were many,if any, games programmed in 128k basic? I was also thinking of doing one myself as I wish to make a text heav…

    ... one basic program that uses ram disk, but for a screen ... 'm sure you can use ram disk, so you'll get ... read the text directy from upper ram with PEEK rather than using ...
    Arda Arda April 2013 Sinclair Basic
  • Covertape speedloaderThere was a covertape (possibly YS) that had a speed loader / saver routine included on it. It stood out to me as I recall it had a counter on it, co…

    ... the ROM tape routines to upper RAM, make any adjustments for jump ...
    jonathan jonathan May 2013 Sinclair Miscellaneous
  • Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…

    ... with the lower RAM chips, and sometimes with the upper RAM chips. Occasionally ...
    Pierre Pierre May 2013 Hardware
  • another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…

    ... for lower and one for upper ram.
    Also connected were a ... .
    I also connected a RAM Turbo with Paul Farrow's ... demos, some games and the RAM tester from Paul Farrow.
    bverstee bverstee May 2013 Hardware
  • Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…

    ... display the image. ROM and upper RAM are also available at this ... supply rails to feed lower RAM. The DC-DC converter uses ... data from nowhere because lower RAM won't be ready before ... +5V rail, ULA and lower RAM are ready and working, the ...
    mcleod_ideafix mcleod_ideafix June 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... =mcleod_ideafix;709022]Although non-contended RAM (4532 chips) seem to be ... more Spectrums that have upper RAM faults than lower RAM faults. Perhaps because ...
    Zorn Zorn July 2013 Hardware
  • Issue 2 black paper white borderGot an issue 2 here that has a 6c001e ULA, no cockroach, no transistor mod (although you can clearly see on the top of the z80 and on some legs, some…

    Turned out to be upper RAM data line 2! All sorted now
    Macc Macc July 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    Is it possible to make a little board like this for the upper ram as well?
    gtsamour gtsamour July 2013 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    [QUOTE=gtsamour;711322]Is it possible to make a little board like this for the upper ram as well?[/QUOTE]

    Yes. Please wait for further information...
    Zorn Zorn July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    ... 48K Spectrum with faulty upper RAM, but the initial RAM test routine passes ... a few bytes) of the upper RAM. All sorts of strange things ...
    Zorn Zorn July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    ... one or more of the upper RAM ICs (most likely) or perhaps ... />
    (Tell it to test upper RAM.)

    You might also ... POKE and PEEK in the upper RAM - search through the forums or ...
    Zorn Zorn July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    ... method doesn't always reveal upper RAM faults, but it's worth ...
    Zorn Zorn July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    ... too seems to have faulty upper RAM.

    Update: I've ...
    Zorn Zorn July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    Upper RAM, 4164 chips, get em from ... , but if you search "4164 RAM", you'll get several listings ... an edit:

    Lower RAM are 4116 chips, same source ...
    DEATH DEATH July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    I will change the IC20 then.
    In case of putting a upper ram module, do you send to Portugal?
    camaisin camaisin July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    [QUOTE=camaisin;712351]In case of putting a upper ram module, do you send to Portugal?[/QUOTE]

    Yes. Prices will probably be the same or very similar to those for the lower RAM module.
    Zorn Zorn July 2013 Hardware
  • Issue 2 crashes after about 30 minsHi Guys, I have an Issue 2 zx spectrum that seems to get graphic corruption after about half hour of playing, then finally falls over and crashes. …

    ... version of the ZX Spectrum upper RAM module is working on the ...
    Zorn Zorn July 2013 Hardware
  • ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…

    ... you can disable the extra ram , with a switch.. either on ... 0V (normal operation) or 5V (upper RAM disabled). In the disabled state ... could map itself into the upper 32K if it wanted to ...
    Zorn Zorn July 2013 Sales
  • ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…

    ... isn't executing anything from upper RAM, this switch could be operated ... without any ill effect. The upper RAM should even retain its contents ...
    Zorn Zorn July 2013 Sales
  • Pimping an Issue 4SSo theres this 4S I have, its been a pain in the backside for ages, this and that going wrong then I stupidly broke it properly by inserting a keyles…

    I was waiting the upper ram module to come out but I don't see it being sold on ebay.... Has it officially come out?
    gtsamour gtsamour August 2013 Hardware
  • Pimping an Issue 4SSo theres this 4S I have, its been a pain in the backside for ages, this and that going wrong then I stupidly broke it properly by inserting a keyles…

    ... ;715819]I was waiting the upper ram module to come out but ... paypal notes that its the upper RAM youre after and he will ...
    Macc Macc August 2013 Hardware
  • ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…

    [QUOTE=Zorn;713737]

    I would think that so long as the CPU isn't executing anything from upper RAM....[/QUOTE]

    Or the machine stack?
    DEATH DEATH August 2013 Sales
  • 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…

    ... works, I'd say lower RAM - it's certainly the place ... is - I forget) that disables upper RAM to check if it suddenly ... />
    Desolder all the lower RAM, then socket it, now you ...
    Winston Winston August 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…

    ... />
    Perhaps it means a RAM addressing error was detected, i ... , suggest a fault affecting the upper RAM, but I don't think ...
    Zorn Zorn August 2013 Hardware
  • Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…

    ... MC-routine must run in RAM. The paging circumstances (an address ... copy content of ROM to upper RAM and then "emulate" NMI jump ...
    Shaos Shaos August 2013 Hardware
  • Diodes placed the opposite way in +2A/+3 PCB'sI was just going to report this as a mistake in the schematics drawn by Guesser, but I saw a real board and realize that the schematics are right. […

    ... 0x00,0x01,0x02 to the upper ram address it actually uses 0xff ...
    guesser guesser September 2013 Hardware
  • ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…

    Just ordered an upper ram module :) My low power consumption Speccy will be complete now.
    gtsamour gtsamour September 2013 Sales
  • The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…

    ... /> However the upper tests revealed 4 of the upper RAM chips as dead ...
    Pierre Pierre September 2013 Hardware
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... RCS'ed screen stored in upper RAM, trying the buffered routine to ...
    jamorski jamorski September 2013 Development
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Latest Posts

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    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
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  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
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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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