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Search Again :: Adv Search 1000 results in 0.007s
<1234567…34>
  • 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
  • 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 trailing wires, so the upper RAM module uses almost the ...
    Zorn Zorn July 2013 Sales
  • 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…

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

    When ... lower RAM is good, all upper RAM bad. But the program ... all direct connections between the upper RAM and associated logic, and ...
    DistantStar001 DistantStar001 June 2022 Hardware
  • Spectrum RAM Paks...This jogged my memory (excuse the pun!!) : [url]http://cgi.ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX-SPECTRUM_W0QQitemZ150057889352QQihZ005QQ…

    ... you put one of these 32K Ram packs on a 48K ... ...

    both the internal upper 32k and the RAM pack will ... the Spectrums edge connector to disable internal RAM (unlike the ZX81 ...
    MikeW MikeW November 2006 Sinclair Miscellaneous
  • Black paper, white border. Ram fault?We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working o…

    ... the Z80, lower RAM or upper RAM.

    The best ... of the 74LS157 multiplexers to disable the upper 32K (I can't remember ...
    Winston Winston December 2006 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... bank (the 32K bank).
    This method will disable the upper 32K, and leave ...
    Pilsener Pilsener March 2010 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... 's 2 resistors in the upper 32K control logic (R70 + R71). ... from going low, and thus disable the upper 32K. Not airtight, but a ... you could just ignore the upper 32K: if faulty, it usually ... ?[/QUOTE]
    Uhm... no. The upper 32K is just an optional bonus ...
    RetroTechie RetroTechie March 2010 Hardware
  • SAM programmingHi Can anyone provide any example hello world or graphics/sprite printing style machine code routines for the SAM? I can't seem to find anything rem…

    ... with paging in the upper 32K without too much juggling, ... 32768

    di ; disable interrupts before paging
    ld ... page_mask
    or rom0_off ; disable ROM 0
    out ( ...
    obo obo September 2010 Development
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    [QUOTE=Crisis;672363]so now there is beside the 48k upgrade kit a 128k upgrade interface, wow ![/QUOTE]

    It's not perfect, but works very well.
    And you must disable the 32k upper ram. :D
    Turrican Turrican December 2012 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    You can disable the 32k of upper RAM by a wire or ...
    flopping flopping January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... =flopping;675035]You can disable the 32k of upper RAM by a wire ...
    TK90XFan TK90XFan January 2013 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... />
    [LIST]
    [*]to disable the "upper" 32K if fitted and try again ...
    1024MAK 1024MAK June 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…

    ... a version when you can disable the extra ram , with a ... 0V (normal operation) or 5V (upper RAM disabled). In the disabled ... could map itself into the upper 32K if it wanted to.
    Zorn Zorn July 2013 Sales
  • Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…

    ... /> If the upper 32k of RAM is suspected, you can disable it ([URL ...
    1024MAK 1024MAK August 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…

    Disable the "upper" 32K RAM.

    [I][B]Mark[/B][/I]
    1024MAK 1024MAK 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…

    ... on an easy way to disable the "upper" 32k of RAM (The whole ... working).

    You could disable the ROM by finding resistor ...
    1024MAK 1024MAK October 2013 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    To disable the "upper" 32k of RAM, take a piece ... IC23 to +5V. That will disable the "upper" RAM, as the CAS ...
    1024MAK 1024MAK April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    [QUOTE=1024MAK;764963]To disable the "upper" 32k of RAM, take a piece ... IC23 to +5V. That will disable the "upper" RAM, as the CAS ...
    Brian Brian April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... part of controls the "upper" 32k DRAM chips. So if ... is not fitted, the "upper" 32k DRAM chips will not ... common fault with the "upper" 32k RAM is one or ... and a switch to disable the "upper" 32k of RAM. Take ... the first byte of the "upper" 32k of RAM returns.
    ...
    1024MAK 1024MAK May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... part of controls the "upper" 32k DRAM chips. So if ... is not fitted, the "upper" 32k DRAM chips will not ... common fault with the "upper" 32k RAM is one or ... and a switch to disable the "upper" 32k of RAM. Take ... the first byte of the "upper" 32k of RAM returns.
    ...
    Brian Brian May 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    To disable the "upper" 32k of RAM, take a piece ... ) to +5V. That will disable the "upper" RAM, as the CAS signal ...
    1024MAK 1024MAK May 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    [QUOTE=1024MAK;769691]To disable the "upper" 32k of RAM, take a ... to +5V. That will disable the "upper" RAM, as the CAS ... How to proceed? As the upper memory (or the logic ... I] or [I]which upper memory chip is gone[/ ... because of brand and upper half or lower half. ...
    georgedb georgedb June 2014 Hardware
  • Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…

    To disable the "upper" 32k of RAM, take a piece ... access and therefore test the upper RAM.

    Double and ... WILL damage something. That will disable the "upper" RAM, as the CAS ...
    1024MAK 1024MAK April 2016 Hardware
  • Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…

    [quote="1024MAK;857827"]To disable the "upper" 32k of RAM, take a piece ...
    HZJ HZJ April 2016 Hardware
  • 48K Issue 2 Spectrum showing exactly 16KI've acquired an issue 2 and it quickly became clear that only 16K of memory is available. I've read that some early 48K Spectrums with malfunctionin…

    ... data bit. So for the "upper" 32k bytes of RAM, you need ... eight bits wide. If one "upper" 32k DRAM chip fails completely, you ... no purpose make link to disable the "upper" 32k bytes of RAM, but ... sell machines with non-functional "upper" RAM as 16k byte machines ...
    1024MAK 1024MAK August 2016 Hardware
  • Three feet later...Three feet of solder wick later, that is, after clearing the holes where the 4532 (upper 32K) memory was on the issue 4B board I've finally got aroun…

    ... the holes where the 4532 (upper 32K) memory was on the issue ...
    Winston Winston August 2007 Hardware
  • Speccy 48Got a speccy 48 ver 4S with an interesting problem i havent been able to get to the bottom of. It starts ok, and i get the Sinclair research messag…

    ... 4116's and disabled the upper 32K, all to no avail.
    spodula spodula February 2010 Hardware
  • ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…

    ... I suspect upper memory block. I dont know how to disable it ... power from IC27 instead to disable upper memory block ?
    emes30 emes30 July 2010 Hardware
  • Dumb question but deep answer wantedWhy is the ram on the 48k made up of 8 chips. Both upper 32k and lower 16k (4116) are set up like this. Taking the 4116 as an example this us a singl…

    Why is the ram on the 48k made up of 8 chips. Both upper 32k and lower 16k (4116) are set up like this. Taking the 4116 as an example this us a single 16k dram chip, so why the need for 8 of them?

    I've read so much I am going snow blind;-)
    hedge hedge December 2010 Hardware
  • So frustratingI'd recently socketed the lower 16k only to find the upper 32k also had issues. While removing 4 of the chips I've managed to break two tracks. The c…

    ... 16k only to find the upper 32k also had issues. While removing ...
    hedge hedge December 2010 Hardware
<1234567…34>

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