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Search Again :: Adv Search 1000 results in 0.016s
<1234567…34>
  • 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…

    ... found an SRAM based replacement for the lower RAM that works in ... the column address to the RAM and so there isn't ... that appear on the lower RAM address lines. In particular, in ... is the ZX Spectrum Lower RAM Replacement Module, pictured below:

    Zorn Zorn May 2013 Hardware
  • Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …

    ... 16385) loaded at the screen RAM, so contention should be strong ... may simplify some hardware, notably speed enhancements. Theorytically, it's possible ... possible, will depend upon the speed of RAM, speed of ROM, and maybe ...
    mcleod_ideafix mcleod_ideafix October 2009 Hardware
  • ula bookula book is here: [url]http://www.zxdesign.info/book/[/url] can i post sam coupe stuff here - she kind of is a speccy if you stuff the speccy rom i…

    ... ram speed
    oh and external ram is not internal rom speed as external ram ... slightly less than the internal ram?

    has anyone ... blitter dumping stuff in video ram - would this have required ... and dma to access same ram addresses?

    what ...
    Roger Jowett Roger Jowett September 2010 Hardware
  • lower ram "new" replacement board.[url]http://www.ebay.co.uk/itm/230994088030[/url] I'm sure others have seen it .. but is it "like for like" compared to the original. .with regard …

    [url]http://www.ebay.co.uk/itm/230994088030[/url]


    I'm sure others have seen it .. but is it "like for like" compared to the original. .with regard timings etc ?
    fog fog June 2013 Hardware
  • Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…

    ... a couple with busted lower RAM, Sooo, I appreciate I could ... a swanky ZX Spectrum Lower RAM Replacement Module, but I think that ... feasible to actually make a ram module replacement with ease?
    Korinel Korinel January 2016 Hardware
  • The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…

    ... quote]
    Actually, a double speed mode throws off a lot ... accesses to RAM when running at double speed unless you ... contention by alternating RAM access. For double speed, interleaving memory ... />
    Doubling ULA and RAM speed I wouldn't worry about ...
    Alcoholics Anonymous Alcoholics Anonymous October 2006 Sinclair Miscellaneous
  • Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…

    ... , putting faster RAM in machine will not change overall speed at all ... some setting of RAM controller speed.

    By Spectrum RAM speed depends strictly ... from ULA and CPU clock speed, so no speed ...
    piters piters September 2008 Emulators
  • Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…

    ... faster RAM in machine will not change overall speed at ... so it's not the RAM speed itself, but additional setting( ...
    [quote]
    By Spectrum RAM speed depends strictly from ULA and ...

    [quote][Speed]
    Not from RAM, no. 128k models ran ...
    ewgf ewgf September 2008 Emulators
  • Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …

    ... is possibly the gatekeeper to RAM (so the CPU accesses it ... dealt with. And probably faster RAM than 200ns, perhaps :-)[/QUOTE]
    RAM size and especially RAM speed (as part of ...
    roko roko October 2009 Hardware
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    Lower RAM (4116) replacement is [I]technically[/I] a ... />
    Uses ordinary 32Kx8 static RAM + 2 logic IC's - all ... own Speccy collection, most lower RAM still works, but keyboard foils ...
    RetroTechie RetroTechie September 2010 Sinclair Miscellaneous
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... can get data into RAM, not the CPU speed.[/QUOTE]
    < ... br /> Specifically, screen RAM - which is ... clone with 10ns RAM could net quite a speed increase). So ... you reach the RAM's speed limit).

    The RAM speed thing is ...
    Winston Winston December 2010 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... QUOTE=Winston;499457]
    The RAM speed thing is why Acorn designed ... ARM: Acorn observed that the speed of a computer was pretty ... pipelines and pipeline logic. Tying RAM speed to CPU clock is a ... CISC processors dealt with slow RAM in an additional way: do ...
    Alcoholics Anonymous Alcoholics Anonymous December 2010 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... QUOTE=Alcoholics Anonymous;499468]Tying RAM speed to CPU clock is a ... of memory bandwidth and processing speed went pretty much hand ... 150ns speed rating of the 4116 RAM. DRAM effectively has two speed ratings ... even a Speccy at full speed).

    It wasn ...
    Winston Winston December 2010 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... its cycle time tied to RAM speed would be optimal. Being able ... in the early '80s that RAM speed was going to be the ... bottleneck with their speed following a decidedly less rapid ... cpu would improve only as RAM speed improved whereas other designs could ...
    Alcoholics Anonymous Alcoholics Anonymous December 2010 Hardware
  • CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…

    ... ram speed
    oh and external ram is not internal rom speed as external ram ... slightly less than the internal ram?

    has anyone ... blitter dumping stuff in video ram - would this have required ... and dma to access same ram addresses?

    what ...
    Ralf Ralf October 2011 Chit chat
  • CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…

    ... ram speed
    oh and external ram is not internal rom speed as external ram ... slightly less than the internal ram?

    has anyone ... blitter dumping stuff in video ram - would this have required ... and dma to access same ram addresses?

    what ...
    polomint polomint October 2011 Chit chat
  • CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…

    ... ram speed
    oh and external ram is not internal rom speed as external ram ... slightly less than the internal ram?

    has anyone ... blitter dumping stuff in video ram - would this have required ... and dma to access same ram addresses?

    what ...
    Wookiee Wookiee October 2011 Chit chat
  • The most powerful 8-bit machine, and CPU?Further to the discussion in: [url]http://www.worldofspectrum.org/forums/newreply.php?do=newreply&p=621787[/url] What actually is the best 8-bit ma…

    ... memory as registers) ties speed to RAM speed which even in the day ... cpus at the same clock speed and therefore often confuse cycle ... />
    Putting aside differences in speed, there are a lot of ... /> I associate most powerful with speed though so I would go ...
    Alcoholics Anonymous Alcoholics Anonymous April 2012 Chit chat
  • 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 …

    ... i 200ns.
    Well, then RAM speed is not advantage here, most ...
    kpuchatek kpuchatek October 2012 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…

    ... Emelio the 300ns ram chips, not thinking of the speed of the ... /> In the 48K models the speed of the chips isn't ... does anyone know the minimum RAM speed to be used? 500ns or ...
    bverstee bverstee May 2013 Hardware
  • Significant machines by yearI'd roughly divide Spectrum's hardware history into four periods: Sinclair (1980 to 1985), Amstrad (1986 to 1988 ), Russian (1989 to 1996) and Homebr…

    ... lucked out with advancements in RAM speed that it did not suffer ...
    nuggetreggae nuggetreggae October 2013 Hardware
  • Overclock the Z80 cpu to smooth out gameplay?Was thinking today of a Genesis/Megadrive mod I did a while back. It involved lifting the CLK leg on the motorola 68000 cpu (which in the MD, if I r…

    Ahh too bad :/

    As far as slow downs go in some speccy games, what would be the bottle neck? ...CPU, RAM speed, ULA..?

    t
    thomas3120 thomas3120 November 2013 Hardware
  • Overclock the Z80 cpu to smooth out gameplay?Was thinking today of a Genesis/Megadrive mod I did a while back. It involved lifting the CLK leg on the motorola 68000 cpu (which in the MD, if I r…

    ... be the bottle neck? ...CPU, RAM speed, ULA?[/QUOTE]

    Usually ... has no contention in shared RAM.
    chev chev November 2013 Hardware
  • Can a HDD kill a laptop?It's certainly looking as though this is what has happened. My laptop died. Awww. I'd had it for years, and all of my Monument files were on it.…

    take the drive out, leave the ram in. What happens?
    Also, check that the ram speed is compatible with that laptop.
    MatGubbins MatGubbins August 2015 Chit chat
  • Can a HDD kill a laptop?It's certainly looking as though this is what has happened. My laptop died. Awww. I'd had it for years, and all of my Monument files were on it.…

    ... ?
    Also, check that the ram speed is compatible with that laptop ... never any problem with the RAM. :/

    Anyhoo... I took ... drive out and left the RAM in. Laptop = dead.
    I ... then took the RAM out and left the HDD ...
    Graz Graz August 2015 Chit chat
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... / TR5 replaced
    Lower Ram NOS replacement
    Z80 replaced
    Jumper ... fix broken trace from lower ram to ULA
    Changed all ...
    New keyboard membrane
    Replacement rubber grommit/foot
    lesoleil70 lesoleil70 November 2015 Hardware
  • Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…

    ... feasible to actually make a ram module replacement with ease?[/quote]
    RAM replacement module.
    RetroTechie RetroTechie January 2016 Hardware
  • What should your speccy have come with ?:) I was thinking about this earlier. What changes should of been made to the Speccy when you purchased yours ? Realistically this topic really…

    ... : the chip speed was more decoupled from ram speed. The gap ... clock speed and z80 clock speed increased with years because ram speed ... The coupling with ram speed aside, when comparing speed you have to ... the z80 because of the ram speed thing.

    ...
    Alcoholics Anonymous Alcoholics Anonymous January 2017 Sinclair Miscellaneous
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... period because its speed was less tied to contemporary ram speed. Ease of ...
    Alcoholics Anonymous Alcoholics Anonymous April 2017 Sinclair Miscellaneous
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... period because its speed was less tied to contemporary ram speed. Ease of ...
    mik3d3nch mik3d3nch April 2017 Sinclair Miscellaneous
<1234567…34>

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ram 12.6K 21.4K
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