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<1234567…34>
  • 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 ... Spectrum uses a 128 cycle refresh.
    Now 41256's are ... they need a 256 cycle refresh if you want to use ...
    Rorschak Rorschak October 2013 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 quoted ...
    Winston Winston May 2009 Hardware
  • 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…

    ... I've not mentioned RAM refresh, but that's because I ... won't go over any DRAM refresh maximums).

    This experimentation ...
    Winston Winston November 2014 Hardware
  • 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;

    But ...
    klingler klingler July 2004 Development
  • 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;[/quote]

    cyborg cyborg July 2004 Development
  • 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;
    [/quote]
    DRAM rows are refreshed neither results ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…

    ... 's also responsible for DRAM refresh and I believe it' ... using the z80's refresh cycle to do the ... counting and adding an 8th refresh bit itself. Maybe the ... z180's periodic refresh cycle would still be coped ... as the usual z80 refresh cycle. Maybe it would ...
    Alcoholics Anonymous Alcoholics Anonymous September 2006 Sinclair Miscellaneous
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... the wrong kind of 'refresh' - I think refresh when discussing graphics effects ... refresh, rather than DRAM refresh. You can't programatically do anything about the DRAM refresh ...
    Winston Winston March 2007 Hardware
  • toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…

    ... ]@Winston:[/B][/U]
    [U]Refresh:[/U]
    Ooops, I think ... indeed may have taken video refresh as DRAM refresh. So, to lay it ... " effect is NOT related to DRAM refresh at all???
    [U]ROM ...
    Marcelo Marcelo March 2007 Hardware
  • 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, …

    ... 128 also exceeds the maximum refresh time of the memory containing ... really the most probable cause - DRAM refresh being insufficient. The 48k model ... and both exceeded the maximum refresh time for lower RAM - which ...
    Winston Winston January 2008 Hardware
  • Z80 ApplicationsI never realised how widely in use the humble Z80 processor was in early Arcade games (Galaga had 3 running in Parallel), Fax Machines, Photocopiers,…

    ... and +12v rails), and integrated DRAM refresh logic, to make it easy ...
    Winston Winston September 2008 Hardware
  • Spectrum 'slow down' hardwareAny one else got one of these ? If so do you find it useful ? [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=…

    ... hack) then the issue of DRAM refresh must have been addressed. My ...
    RST#08 RST#08 October 2008 Hardware
  • Spectrum 'slow down' hardwareAny one else got one of these ? If so do you find it useful ? [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=…

    ... hack) then the issue of DRAM refresh must have been addressed. My ... result in interrupting the memory refresh. Access by the ULA will ... continue to refresh the bottom 16K though, so ...
    Matt_B Matt_B October 2008 Hardware
  • Spectrum 'slow down' hardwareAny one else got one of these ? If so do you find it useful ? [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MESELX:IT&item=…

    ... hack) then the issue of DRAM refresh must have been addressed. My ...
    velesoft velesoft October 2008 Hardware
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    ... issue M1 cycles to allow DRAM refresh while the CPU is halted ...
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…

    [QUOTE=Dr BEEP;499310]See [URL]http://www.z80.info/z80time.txt[/URL][/QUOTE]
    That list has quite a few errors, for example there exist no
    RetroTechie RetroTechie December 2010 Development
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... bits of R could affect dram refresh on old systems.

    Alcoholics Anonymous Alcoholics Anonymous January 2011 Development
  • How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…

    ... do anything *special* to maintain DRAM refresh: for DRAMs to maintain their ... the screen involves 'walking' all DRAM rows, this already happens & ...
    RetroTechie RetroTechie January 2011 Hardware
  • Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…

    ... cant quite figure out how DRAM would get refreshed, but Thats ... the 128k conversions deal with DRAM refresh, however, as i mentioned earlier ...
    spodula spodula February 2011 Hardware
  • Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…

    ... the 128k conversions deal with DRAM refresh, however, as i mentioned earlier ... /> Bottom line is that the refresh [i]shouldn't[/i] work ... maximum period specified for the DRAM to guarantee data retention. You ...
    csmith csmith February 2011 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... system to take over the DRAM refresh, then you could steal the ... memory cycle during the Z80 refresh memory access (you would of ...
    1024MAK 1024MAK October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... system to take over the DRAM refresh, then you could steal the ... memory cycle during the Z80 refresh memory access etc.[/QUOTE]
    refresh cycles.
    So IMHO there ...
    roko roko October 2012 Hardware
  • Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…

    ... opcode fetch (M1) cycles for DRAM refresh, then if following cycles have ...
    Woody Woody June 2013 Emulators
  • Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…

    ... opcode fetch (M1) cycles for DRAM refresh, then if following cycles have ...
    introspec introspec June 2013 Emulators
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... if it's generating a dram refresh for example?

    Would ...
    guesser guesser July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... if it's generating a dram refresh for example?

    Would ...
    Zorn Zorn July 2013 Hardware
  • 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…

    ... how the Spectrum and the DRAM chips work AND you need ... you may still see the DRAM refresh addresses on A0 to A6 ... way of dealing with a DRAM failure, is to remove all ...
    1024MAK 1024MAK August 2013 Hardware
  • Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …

    ... rid of unnecessary circuity like DRAM refresh etc.

    Also there ...
    lezanderson lezanderson December 2013 Hardware
  • Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …

    ... rid of unnecessary circuity like DRAM refresh etc.
    [/QUOTE]

    DRAM refresh circuits by the way - the ... by the Z80's inbuilt DRAM refresh.
    Winston Winston January 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…

    ... code as it always generates DRAM refresh signals.
    Z80 address lines ...
    1024MAK 1024MAK April 2014 Hardware
<1234567…34>

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