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Search Again :: Adv Search 646 results in 0.001s
<1234567…22>
  • 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, …

    ... me the definitive rules on DRAM access times in terms of ... have a number of handy DRAM chips that are 60ns (compared ...
    Phu Phu January 2008 Hardware
  • DRAM without powerSomething interesting I noticed last night, after making a bad Spectranet ROM image which crashed the machine... Looking at the image on the screen,…

    ... for the maximum time between DRAM refresh cycles. Perhaps the values ...
    Winston Winston May 2009 Hardware
  • Understanding DRAMI think I am going slightly mad. My hardware knowledge has got more rusty than it should have done, and I am going to have to turn to the experts to…

    ... head around the way that DRAM, and specifically upper memory is ...
    ramsrc ramsrc September 2013 Hardware
  • Question about 48K DRAM refreshHi guys. Can anybody tell me how the 48K spectrum refreshes the upper ram. RAS only? CAS before RAS? I've got a bunch of 41256 DRAM that i would lik…

    ... got a bunch of 41256 DRAM that i would like to ...
    Rorschak Rorschak October 2013 Hardware
  • Faulty DRAM chips wanted!If you have any suspect or known faulty DRAM chips, I'm after some so I can conduct some testing. I only want chips that are DIL type, either 16 p…

    ... any suspect or known faulty DRAM chips, I'm after some ...
    1024MAK 1024MAK November 2016 Wanted
  • 4116 4164 DRAM testersSaw this and thought it may be of interest. https://www.ebay.co.uk/itm/DRAM-TESTER-for-4116-ZX-Spectrum-48k-other-retro-computers/154054505831?_tr…

    ... ://www.ebay.co.uk/itm/DRAM-TESTER-for-4116-ZX-Spectrum ... ://www.ebay.co.uk/itm/DRAM-TESTER-for-4164-ZX-Spectrum ...
    moggy moggy August 2020 Sales
  • Replacment 3" drivesIs there a place to get them. ?

    Is there a place to get them. ?
    madpierre madpierre February 2007 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    Someone told me I got faulty RAM in my broken 48K.
    They should be 150ns, right?
    What would be a good place to buy them from?
    orange orange December 2008 Hardware
  • SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…

    ... . You know, those pesky 4116 DRAM chips, that need 3 different ...
    RetroTechie RetroTechie February 2009 Hardware
  • Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…

    ... [Hitachi / NEC / other] [Datecode]
    DRAM : [ProductCode] [Datecode]
    Modulator : [Datecode ... ROM : Hitachi 8213
    DRAM : MM5290N-2 8206, 8137, 8204 ...
    Jakeyw Jakeyw August 2009 Sinclair Miscellaneous
  • Happy Birthday jmkHappy Birthday jmk! Treat yourself to a wee dram! Ach Eye The Noo!

    Happy Birthday jmk! Treat yourself to a wee dram! Ach Eye The Noo!
    frobush frobush January 2010 Chit chat
  • 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…

    ... a set of eight 4116 DRAM chips. These are very ... a bank of 8 4164 DRAM chips, again each providing ... are the infamous half faulty DRAM chips, they are actually ... slightly more than the 8 DRAM chips, a 74LS00, a ... to removed the 8x16 pin DRAM chips its a bargain, ...
    Womble Womble August 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
  • Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …

    ... models, but need remove 8 dram chips (from sockets ideally).
    velesoft velesoft March 2011 Hardware
  • 4116 and 4164 chip avaliableHi all, while clearing out lots of old odds and sods I have come across a fair number of old dram memory chips. I have 200+ 4164 from various manufa…

    ... a fair number of old dram memory chips.
    I have ...
    shammster shammster February 2012 Hardware
  • Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…

    ... is in sram memory. 8 DRAM chips in ZX is used ... for keyboard

    - all dram chips, CPU,rom, hal, TEA2000 ...
    velesoft velesoft October 2012 Sales
  • 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. […

    ... the RAM address too, as DRAM's don't care if ... there is a unique DRAM address, and DRAM address are always supplied ...
    mcleod_ideafix mcleod_ideafix September 2013 Hardware
  • Repalce 4164 RAM by 41464Dear all, I have some amount of 41464 DRAM from old PC VGA card which are useless at the moment. I think to keep them as a spare for the upper 32k R…

    ... have some amount of 41464 DRAM from old PC VGA card ...
    maskenlos maskenlos December 2013 Hardware
  • FS: MOSTEK 4116 DRAM for 48k SpeccysHi I have a bunch of Mostek 4116 DRAMs here for the 48k Speccy - fits in the lower 16k memory bank. They look like NOS unused, still in their origin…

    Hi

    I have a bunch of Mostek 4116 DRAMs here for the 48k Speccy - fits in the lower 16k memory bank. They look like NOS unused, still in their original MOSTEK printed chip holder tube thingies.

    Asking ?7.95 for a set of 8, plus P& ...
    JonB JonB February 2014 Sales
  • Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…

    ... won't go over any DRAM refresh maximums).

    This ...
    Winston Winston November 2014 Hardware
  • Joytsick Interface damaged SpectrumHello All, Sob.. I am a plonker, I did the cardinal sin, I was testing a bunch of joystick interfaces that I got off ebay and one didn't have the ke…

    ... . Does this mean the lower DRAM is now toast?

    Korinel Korinel January 2015 Hardware
  • My experience with a ZX Spectrum clone called Elwro 800 JuniorAfter a long break in using this forum (modellrailroading is my main hobby) I'm back and want to tell something about an interesting ZX Spectrum clon…

    ... /> Computers had:
    - 64 KB DRAM
    - 24 KB ROM
    brian-82 brian-82 August 2015 Hardware
  • Spectrum Ram UpgradeHi, I am looking to upgrade my 16K Spectrum to 48K. I have some 41256 dram chips from an old QL memory expansion, can the Spectrum us the large…

    ... />
    I have some 41256 dram chips from an old QL ...
    doubledecca doubledecca August 2015 Hardware
  • The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…

    ... ROM in ROM-A
    DRAM in ROM-B with write ...
    bverstee bverstee October 2015 Hardware
  • Screen corruption with devices on edge connector (grey +2)Hi, I've recently done a full capacitor replacement and replaced all 16x DRAM chips on my grey +2. Prior to this I would get a corrupted screen…

    ... replacement and replaced all 16x DRAM chips on my grey +2 ...
    Megatron-UK Megatron-UK August 2020 Hardware
  • Using a thermal camera to fix speccy's.Hi All, Thought I'd share another repair... Got a board that collapsed the bench supply straight away ( I run a bench supply and give it just enou…

    ... to identify and locate faulty DRAM chips... It does tend to ...
    cj7hawk cj7hawk December 2021 Hardware
  • ahem!.. could I have a minute of everyones time please :)ok... here's the thing. I'm looking into sourcing some spare IC's for the whole range of Spectrums - mainly memory, as that's probably the weakest l…

    ... total coverage as far as DRAM goes.
    GP GP February 2003 Sinclair Miscellaneous
  • cotrols of wolfenstein type gameif would be a wolfenstein style game written for spectrum, what kind of control should be used ? just turn left, right, go straight, go back via joys…

    Yup, sounds like the same one...if I remember right, OCP Art Studio also came with this wee orange plastic thing that you used to decrypt an onscreen code, which I lost quite a few of, and had to write to the company for a replacment.
    The Lone Magpie The Lone Magpie October 2003 Games
  • C64 & Spectrum loadingscreens!I was bored today, so I decided to compare some stuff. :) [url="http://www.lemon64.com/loadingscreens/"]http://www.lemon64.com/loadingscreens/[/ur…

    ... the row part on the DRAM pins, strobe it, place the ... column part on the DRAM pins and then read the ...
    Alcoholics Anonymous Alcoholics Anonymous February 2004 Games
  • FAST PIXEL DRAWINGI'm looking for the fastest way to put a pixel to the screen (on spectrum ofcoz:). Here is my own procedure (written in PASMO). But I don't how do it…

    ... the intention was to make DRAM refresh easier (o;

    klingler klingler July 2004 Development
<1234567…22>

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Related Threads

  • Replacment 3" drivesIs there a place to get them. ?
  • DRAM (:baffled:)Hi,<br /> <br /> Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor?<br …
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K.<br /> They should be 150ns, right?<br /> What would be a good place to buy them from?
  • DRAM without powerSomething interesting I noticed last night, after making a bad Spectranet ROM image which crashed the machine...<br /> <br /> Looking at the image on…
  • Understanding DRAMI think I am going slightly mad. My hardware knowledge has got more rusty than it should have done, and I am going to have to turn to the experts to…
  • Question about 48K DRAM refreshHi guys.<br /> <br /> Can anybody tell me how the 48K spectrum refreshes the upper ram. RAS only? CAS before RAS?<br /> I've got a bunch of 41256 DRA…
  • FS: MOSTEK 4116 DRAM for 48k SpeccysHi<br /> <br /> I have a bunch of Mostek 4116 DRAMs here for the 48k Speccy - fits in the lower 16k memory bank. They look like NOS unused, still in …
  • Faulty DRAM chips wanted!If you have any suspect or known faulty DRAM chips, I'm after some so I can conduct some testing.<br /> <br /> I only want chips that are DIL type,…
  • 4116 4164 DRAM testersSaw this and thought it may be of interest.<br /> <br /> https://www.ebay.co.uk/itm/DRAM-TESTER-for-4116-ZX-Spectrum-48k-other-retro-computers/1540…

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