World of Spectrum
  • Categories
  • Discussions
  • FAQ
  • Sign In
Home › Search
Title Search
@title beer Word 'beer' in title
User Search
  • @user admin Only posts by Admin
Text Search
  • @body beer Word 'beer' in the text
Phrase Search
"Hello World" Exact phrase match
Exclude Terms
  • car -red Search cars that are not red
"Or" Searches
  • honda | bmw 'honda' or 'bmw' results
Multi-Field
@(title,body) hello Both contain 'hello'
WildCard
  • hond* civ* Match all with an astrix
Combination
  • @title bmw @user admin
See more supported syntax examples
Search Again :: Adv Search 1000 results in 0.012s
<1…11121314151617…34>
  • Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…

    ... need to change all the 4116 RAM chips, and your peripherals may ...
    Spirantho Spirantho October 2011 Hardware
  • Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…

    ... ?[/QUOTE]
    Apart from the 4116 DRAMs, the LM1889 & surrounding ... lower [I]and[/I] upper RAM (details [URL="http://bitcycle.org ...
    RetroTechie RetroTechie October 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... the Spectrum with the lower RAM all removed, then the display ... CPU (still with the lower RAM removed) doesn't have any ... haven't got any spare 4116 DRAMs to hand, so I ...
    Zorn Zorn November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... CPU (still with the lower RAM removed) doesn't have any ... />
    With all the lower RAM missing, a "working" Spectrum shows ... /> So, in absence of lower RAM, shorting C27 and leaving it ... haven't got any spare 4116 DRAMs to hand, so I ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... haven't got any spare 4116 DRAMs to hand, so I ... up an SRAM as lower RAM. But to fit on a ... easiest to find some replacement 4116's now (sorry to say ...
    RetroTechie RetroTechie November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... />
    Removing the lower RAM was time consuming and fiddly ... certain is a lower RAM failure (it only sometimes ... a working set of 4116 ICs for the one ... for refreshing the upper RAM while the ULA has ... Spectrum with the lower RAM removed, it does sometimes ...
    Zorn Zorn November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... plain white screen when lower RAM removed? Don't know for ... more 'solid' each time an 4116 is added. BTW modification for ...
    roko roko November 2011 Hardware
  • Spectrum+ problemsI was testing my other Spectrum+ in order to sell and discovered that some of the keys weren't working. No problem, I said, I have a spare Spectrum+ …

    ... eventually found one of the 4116 DRAM chips to be 'dodgy ... eventually replace the lower 16K RAM with SRAM on a little ... board as I want the 4116 chips for a rubber keyed ...
    Zorn Zorn December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... I identified a couple of 4116 ICs that were clearly dead ... a few bits in lower RAM are being unreliable.

    4116 ICs to my Spectrum+ (even ... anyone here aware of any RAM test software for the Spectrum ...
    Zorn Zorn December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... the display area of RAM and lowering the RAMTOP ... of RAM.

    It quickly identified another 4116 chip ... reported and changed the 4116 that's responsible for ... /> I moved all 8 4116 chips that were the last ... control signal for the lower RAM.

    Are ...
    Zorn Zorn December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... This Spectrum mostly works with 4116 RAM installed, but suffers from ... corruption of data in this RAM (as described earlier).
    4116 ICs to it and ... RAM installed.

    I put the same 4116 ... applied to the lower RAM on a problem free ...
    Zorn Zorn December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... be happening on the lower RAM address lines when the border ... contents of RAM. Perhaps it's a 'feature' of the 4116 that ...
    Zorn Zorn December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... the CPU accesses the lower RAM.

    I've made ... address lines at the lower RAM changing in what seems to ... the case.

    The 4116 datasheet says the row address ...
    Zorn Zorn December 2011 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... be correct in assuming the RAM may also have gone??[/QUOTE ... cases, both are true. If 4116 RAM is powered up without the ...
    Winston Winston December 2011 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... -.25V is coming from(!) the 4116 chips.

    [QUOTE]The ... be correct in assuming the RAM may also have gone??[/QUOTE ...
    roko roko December 2011 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... that occurs when the lower RAM isn't working correctly ... least some of the lower RAM is faulty, I also ... method all the lower RAM ICs can be removed ... 't.

    Replacement 4116 ICs aren't always easy ... possible to replace the lower RAM with a fairly simple ...
    Zorn Zorn January 2012 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... suspicion is that a 250ns 4116 might work in an ... likely need more than one 4116 replacement.

    Has ... Once you've removed the 4116 ICs, with a bit of ... its not connected to the ram Im getting -1v not ... going to remove all the ram chips and put sockets ...
    Marshall Marshall January 2012 Hardware
  • BeginnerIm having a go at fixing a spectrum which has been in the loft for 20 years and would like some advice please.... I have downloaded the 'spectrum se…

    ... a bad idea for the ram containing the video, as the ... remember the speed of the 4116 chips in the speccy off ... 're ripping out all the 4116, you could replace with two ...
    csmith csmith January 2012 Hardware
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... had to unsolder all the 4116 chips, then replaced them ... one of the upper RAM ICs wasn't fitted ... values compared to other lower RAM chips, when measuring impedance ... broke a perfectly good 4116 chip just to find ... do is order some 4116 chips to replace that ...
    deckard deckard January 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... that it would work with RAM installed.

    ... recently. I installed 8 4116 ICs that I'd tested ... at all the lower RAM socket pins look reasonable ... problem with the lower RAM, but that something else ... stuck. Perhaps an upper RAM problem could cause this - ...
    Zorn Zorn January 2012 Hardware
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... /> I have double checked the 4116 RAM in another Spectrum and it ... to some of the lower RAM or perhaps some bits in ... installed. This led to lower RAM corruption in another Spectrum, but ...
    Zorn Zorn January 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    The lower 16K of RAM is formed by IC6-IC13 ... supply connections to the lower RAM that led to the failure ... and correct that, any replacement 4116 ICs you install will probably ...
    Zorn Zorn February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... pins on the lower RAM chips (8x 4116, lower left corner of ... are back in place! These RAM chips are very sensitive to ... quickly by one or more 4116 RAMs dying too.

    RAM is socketed, you can just ...
    RetroTechie RetroTechie February 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... is to produce a 4116 replacement using parts that ... CPU access to the lower RAM. In earlier Spectrums this ... is presented to the RAM for only about 20ns ... minimum time given in the 4116 datasheet. It has also ... for some of the 4116 replacement circuits I have ...
    Zorn Zorn February 2012 Hardware
  • Three faulty machines - help!I have three Spectrums and all of them have suddenly collapsed and I can?t figure out what?s wrong. New here.... I own three Speccies but all of a …

    ... pins on the lower RAM chips (8x 4116, lower left corner of ... are back in place! These RAM chips are very sensitive to ... quickly by one or more 4116 RAMs dying too.

    RAM is socketed, you can just ...
    dynaflux dynaflux February 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... to know exactly what the RAM access timing differences are between ... lines from the Spectrum's 4116 sockets go directly to the ... some tests relating to CPU RAM access (and in particular writes ...
    Zorn Zorn March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... low) and (/CAS going low). 4116 DRAMs probably need some time ... be enough time for a 4116 and I think it is ... is closer to what a 4116 might do). Say 100~150 ... place CPU writes to lower RAM sometimes get corrupted. I am ...
    Zorn Zorn March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... SIMM memory module to replace 4116 DRAM's.[/QUOTE]

    RAM replacement circuit is clearly right ...
    Zorn Zorn March 2012 Hardware
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... damaged low memory as well (4116 DRAM's) with a very ... more (or all) the upper ram is dead?[/quote]
    Based ... , bad chips?[/quote]
    - Upper RAM exposes their data bus on ... by the regulator. Besides, the 4116 memory chips (those used for ...
    mcleod_ideafix mcleod_ideafix March 2012 Hardware
  • 48K's and bad DivIDE compatibilityI have had some 48K boards and complete machines in the past which didn't work fully with a DivIDE interface. The reason for that always was a Z80 pr…

    ... one board and removed all ram above 16K and the logic ... /> The active parts remaining:
    - 4116 ram ic's
    - all transistors ...
    bverstee bverstee March 2012 Hardware
<1…11121314151617…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
  • Celebrity deaths...
    mel the bell on April 20

HitBox

Word Docs Hits
ram 12.6K 21.4K
4116 933 1.4K

Related Threads

  • Wanted 10 - 4116 Ram ChipsHi<br /> Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minim…
  • Source of 4116 ramSomeone on eBay was selling 500 pieces of 4116 ram. The auction ended without bids, but he's willing to sell it in lots of 50 now. Someone in Spain a…
  • 4116 ram chipsI need some ram chips to fix my 48k + issue3b, I have done the composite video mod and it works, now i just wanna play games on it but its stuck on r…
  • 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…
  • 4116 Ram chip replacements?Hello. I am in the work of gathering replacement parts for my speccy 48k. And I would like to know what chips is good replacement for the 4116 ram ch…
  • 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…
  • 4116 Ceramic Ram ChipsHi all,<br /> <br /> I have a few 4116 Ceramic Ram Chips to sell.<br /> <br /> If you have any interest, please PM.<br /> <br /> Greetings,<br /> Ret…
  • 65x used but tested and working 4116 RAM chipsFor any repairman: 65x 4116 chips, used but tested and working.<br /> Different brands, but ITT and STC mainly.<br /> <br /> ?25 + postage.<br /> <br…
  • 4116-15NL vs 4116-20NLProbably this has been asked before but I am not finding the answer..<br /> <br /> Can anyone explain the difference between the 15NL and 20NL chips,…
  • Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…

Related Searches

  • rom to ram
  • modern ram
  • 4116
  • disable uper ram
  • disable upper ram
  • opus rom ram size
  • opus rom 8k ram 2k
  • opus rom 8kb ram 2kb
  • ram upgrade
  • shadow ram
  • page 7 shadow ram
  • z88dk free ram
  • 2a ram
  • ram speed
  • ram speed replacement
  • 4116 speed replacement
  • ram test
  • add more ram to 48k spectrum
  • ram 150ns
  • ram 4116 tr4 tr5

Copyright © 2024 World of Spectrum