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<1234567…34>
  • Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…

    Does anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more available than the 4164. Winston? Piters??

    TIA
    DEATH DEATH August 2007 Hardware
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... passed from testing lower RAM to upper RAM. Here is an example ... first read from the upper RAM location retrieved the decimal ... . were then established in upper RAM, but the system later ... capture the RAM-FILL routine passing from lower RAM to upper RAM, but ...
    Zorn Zorn April 2012 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…

    ... for something similar for the upper 32K RAM in a Spectrum.
    upper RAM module instead or one of ... of trailing wires, so the upper RAM module uses almost the same ... as the lower RAM replacement and emulates dynamic RAM.

    ...
    Zorn Zorn July 2013 Sales
  • 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 …

    I got my new upper ram replacement module from Zorn ... . When I put the upper ram chips back in place, ... again.

    The upper ram are not on the "OKI ... that also has the upper ram module be so kind ... attempts DMA to the upper RAM and uses unusual timings ...
    gtsamour gtsamour September 2013 Hardware
  • Issue 2 Upper Ram, Loading & ResettingI have a 48k Issue 2 Speccy and for the life of me can't track down what the problem is with it. I initially thought that some of the uppe ram ic's w…

    ... some of the uppe ram ic's were faulty ... went on to desoldered the upper ram ic's, socketed the ... board and replaced the ram with known good chips. ... replaced all the upper ram with known good ram from another Issue ... cant now be the upper ram as I swapped and ...
    retrogamemart retrogamemart December 2014 Hardware
  • Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…

    ... diagnostics said the whole of upper RAM was faulty (check all ICs ... , I've removed all the upper RAM ICs, replaced with sockets and ... .

    Given the lower RAM used to be okay, and ...
    Paulcatchpole Paulcatchpole December 2016 Hardware
  • Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…

    ... have 1 spare lower ram, and 1 spare upper ram IC's you ...
    Your Spec-chum Your Spec-chum September 2017 Wanted
  • upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…

    ... would just fry the lower ram again .. this is one board ... looks like somebody attacked the upper ram with a black and decker ... .. any sugestions for replacing the upper ram tracks ?
    mark8bit mark8bit September 2020 Hardware
  • Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…

    ... doesn't see the upper 32k of RAM.

    When it ... , tells me that lower RAM is good, all upper RAM bad. But the ... all the associated logic, and RAM chips, with no effect. I ... all direct connections between the upper RAM and associated logic, and I ...
    DistantStar001 DistantStar001 June 2022 Hardware
  • Black screen on 48k+Hello peeps Just bought a 48k+ was working fine then after leaving it off over night I turned back on to get a total black screen, no border etc. …

    ... and seems to be an upper ram failure. ICs 15-22 apparently each ... easier way of finding which ram chip is responsible? Also. How ...
    jamiejoe jamiejoe May 2016 Hardware
  • 48k black paper white borderI recently sold a speccy to a guy, unfortunately the power supply didnt survive the trip, so on replacing for him it seems neither did the speccy! H…

    ... see it causing a lower RAM failure as there wouldn't be ... causes knock on effects to RAM voltages etc.

    I ... a day then suffer an upper RAM failure!

    B
    balford balford April 2014 Hardware
  • A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …

    ... utils. One of them reports upper ram failure every time with Z84C0008 installed ...
    Wildbillbudgie Wildbillbudgie September 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... the address connections for OKI RAM when the appropriate link could ... if I remove the socketed upper RAM chips and power it up ... powering it up without the upper RAM chips in place wouldn't ... perhaps I can rule out upper RAM failure if the Spectrum initializes and ...
    memrah memrah December 2015 Hardware
  • How can I fix a problematic Retroleum Smart Card. I did not do anything "WRONG " with it but I did but it on a flexible cable and this seems to have "upset" it .Since then It does not perform the …

    ... this . It said lower RAM was OK . Upper Ram failure at $FFFE .Then it ... . The colour palette test confirms upper RAM error encountered . Suspect IC21. IC ... IC21 and what caused the failure ? Does it need a recap ...
    harriusherbartio harriusherbartio February 2020 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... I started , as the lower RAM failure shown with the IC21 chip ... to speak with just the upper Ram problem.

    This ... it was retested it shower upper ram failure at IC15 ,IC16 ,IC17 , ... . So something had caused lower RAM failure this time What a useful ...
    harriusherbartio harriusherbartio March 2020 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…

    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 compatible RAM).

    Thanks,
    Thomas
    thomas3120 thomas3120 February 2010 Hardware
  • Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…

    ... I'd recount a failure I've not seen mentioned ... />
    The background: The initial failure was caused when a peripheral ... br /> 1. A fault in upper RAM causing incorrect instructions to get ... new hypothesis:

    5. Failure of TR6

    Now ...
    Winston Winston December 2013 Hardware
  • The Complete List Of The Causes Of Lower Ram Failure?Well the aim is to get a comprehensive list.I ask this because I know very little about it . I know that failure of "power supply" related capacitors…

    Well the aim is to get a comprehensive list.I ask this because I know very little about it . I know that failure of "power supply" related capacitors can do this . But I suspect there are loads of other ways to damage lower RAM ICs? Any ideas?
    harriusherbartio harriusherbartio March 2020 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... .

    The upper RAM, from 32KB to 64KB on ... BTS 8 means that the failure pattern is 8 in hex ... address loci in the upper address range and got ... as each of the upper RAM chips contributes a single bit ... fault will wreck the upper 32KB totally, leaving only ...
    Womble Womble August 2010 Hardware
  • Replacing Upper RAM in 48KHi Folks Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K machines. Havin…

    ... here it looks like an upper memory fault.

    Before ...
    spookt spookt July 2012 Hardware
  • ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…

    ... read would indicate a lower ram failure. I have lightly touched the ... seem cool.

    The ram fitted is 8322 4116 2N ...
    serene serene June 2013 Hardware
  • POKEs on 128K "upper RAM"?I've been working lately with some 128k games, and I've got this question about RAM in games. I guess most games use RAM pages 5 and 2 to store the …

    ... 've got this question about RAM in games.

    I ... guess most games use RAM pages 5 and 2 to ... the main program, and other RAM pages are used to store ... that needs POKEs placed in RAM pages 1, 3, 4, 6 ...
    Zup Zup October 2013 Games
  • Seriously weird Issue 2 issue... (RAM-related)Hi guys; I have been trying to fix up my Issue 2 and have run across a bizarre issue that I haven't seen elsewhere in the forums. Hopefully one of …

    ... .
    2. MEMCHK returned 32767, upper RAM fault. UPRAM85 returned 93, so ... "black screen and red bars" RAM test appears, after which the ...
    Trafferth Trafferth August 2014 Hardware
  • Upper Memory LinksI've got an 1982 Issue Two Spectrum 48k with an upper RAM fault. I've narrowed down the faulty IC and I'm in the process of removing the 8 IC's, sock…

    ... Two Spectrum 48k with an upper RAM fault. I've narrowed down ...
    retrogamemart retrogamemart September 2014 Hardware
  • Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …

    ... br />
    I suspected faulty upper RAM trashing the stack, and this ... were reporting both lower and upper RAM were healthy.

    ... didn't pick up this failure however, especially as the firmware ... always ended up masking the failure in bit 4 by ...
    balford balford September 2014 Hardware
  • ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…

    ... fitting one of Zorn's RAM boards into an unexpanded ZX81 ... a lot of the official RAM pack's internal circuitry is ... fit one - preferably the 32K upper RAM board, 'cos I never had ...
    DEATH DEATH October 2014 Hardware
  • 128K RAM tester as .TAP?I was sure that I've seen a RAM tester that can be loaded with e.g. DivIDE or DivMMC EnJOY! as .TAP. But I can't find it (been searching through the …

    ... that I've seen a RAM tester that can be loaded ... only a small error in upper RAM.

    I have a ...
    bverstee bverstee January 2015 Hardware
  • Upper memory issueZX Spectrum 48K, issue 2, boots fine. Lower RAM OK. When tested with the new test ROM in the Diagboard, for all upper RAM tests "FAIL" is shown. I…

    ... 2, boots fine.
    Lower RAM OK.
    When tested with ... in the Diagboard, for all upper RAM tests "FAIL" is shown.
    RAM, are the voltages:
    4116 ...
    georgedb georgedb September 2016 Hardware
  • Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…

    ... was a problem with the upper RAM however on running the soak ... minutes. I also performed the RAM test detailed here http://www ... longer or look for non-RAM related issues?
    britain4 britain4 October 2016 Hardware
  • ZX Diagnostics v0.35 ReleasedHi all, I'm pleased to announce the release of zx-diagnostics v0.35, downloadable from [url="https://github.com/brendanalford/zx-diagnostics/relea…

    ... /> Enhancements:
    - Add failure beeps if a RAM issue is detected in ... multiplexer ICs if all 48K upper RAM is faulty (as opposed to ...
    balford balford May 2017 Hardware
<1234567…34>

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Related Threads

  • Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
  • Looking for some 48k RAM (upper 32k bank)Greetings,<br /> I was wondering where I could find some upper RAM for a 48k (issue 4A).<br /> It's the Texas Instruments TMS4532-20NL4 P8419 (or …
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here.<b…
  • 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…
  • Replacing Upper RAM in 48KHi Folks<br /> <br /> Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K mac…
  • 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…
  • 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.<br /> <br /> When the machine is without the Divide …
  • POKEs on 128K "upper RAM"?I've been working lately with some 128k games, and I've got this question about RAM in games.<br /> <br /> I guess most games use RAM pages 5 and 2 t…
  • Issue 2 Upper Ram, Loading & ResettingI have a 48k Issue 2 Speccy and for the life of me can't track down what the problem is with it. I initially thought that some of the uppe ram ic's w…
  • Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. <br /> <br /> It was labelled as 'keyboard…

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