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<1234567…34>
  • memory chips spectrum +Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or …

    Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or do they all need replacing.or do i have to use tms ones
    kenny.tigger kenny.tigger January 2010 Hardware
  • Rod-land - struggling to get working on my real +2 (grey machine)Hi Everyone, I've had a week enjoying tinkering with my +2 and there are only a few games I have not managed to play on my +2 that I enjoyed back …

    ... there are some programs to test memory chips available, try searching the forum ...
    Alessandro Grussu Alessandro Grussu June 2019 Games
  • Spectrum +3 suspected memory faultHi, I've been using my +3 for the first time in a while and found that some games have problems with the display becoming corrupted and sometimes cr…

    ... problem with one of the memory chips used for the extended 128K ... memory. I've tested the first ... peeking, and also tried the test mode which reported the RAM ... way to determine if the memory is at fault, and which ...
    JohnH JohnH November 2009 Hardware
  • Compatible Memory Chips for Issue 2 48K MotherboardHi I was wondering if anybody have a list of manufacturer chips which is compatible with the Issue 2 48K Motherboard, especially the upper 32K RAM.…

    ... have a list of manufacturer chips which is compatible with the ... only the TI (Texas Instruments) Chips must be used in the ... 7 of the 8 RAM chips test faulty. I replaced this with ... some Sharp LH2164-15 chips that were lying in my ...
    Pierre Pierre April 2013 Hardware
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... I thought it was a memory problem, since i tried ... So i removed all memory chips and installed chip beses ( ... I bought five 4864 chips from sintech recently just ... test the faulty one's chips.
    After testing the chips ... it could be a memory controller chip so ...
    gtsamour gtsamour November 2007 Hardware
  • 4164 and 4864 ChipsI have a stock of 4164, 4864 memory chips and 7805 voltage regulators if anyone needs them. Cost would be ?1.50 each plus postage for anyone on here…

    I have a stock of 4164, 4864 memory chips and 7805 voltage regulators if anyone needs them. Cost would be ?1.50 each plus postage for anyone on here!

    They are mainly 20ns

    Rich
    rwap rwap January 2009 Sales
  • de soldering chipshi whats the best method for de soldering memory chips? i have heard its best to put a plug in socket..recently replaced diodes and capacitors on iss…

    hi whats the best method for de soldering memory chips? i have heard its best to put a plug in socket..recently replaced diodes and capacitors on issue 2 board i found this a nightmare even though ive bought a half decent soldering iron,,,
    kenny.tigger kenny.tigger January 2010 Hardware
  • FLASH EPROM programming on ZX SpectrumThis is photo of Winston's DIAGNOSTIC BOARD: [img]http://velesoft.speccy.cz/other/diagboard.jpg[/img] Schematic and flash utilities: [url]http://www…

    ... (or equivalent).

    I test this chips:
    AM29F040B (AMD) - 512kB ... is writed only for 512kB chips ???
    I have also ... ]http://velesoft.speccy.cz/flash-memory.zip[/url]
    [url] ... is usable also my MB02 memory interface:
    [url]http:// ...
    velesoft velesoft May 2010 Hardware
  • Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…

    ... . In my machine the upper memory chips are in sockets so they ... i bought 8 new 4164 chips, but same error: i got ... /> I also have a test program which can test ram. It also ... if i remove upper memory chips, test program says memory is OK.
    Any ...
    lillaolle64 lillaolle64 July 2010 Hardware
  • Spectrum hangs upWhat might be problem when my ZX Spectrum 48K (rubber keys) hangs up after few minutes play? It had memory problems but i changed (or an expert did i…

    ... few minutes play? It had memory problems but i changed (or ... expert did it;)) the upper memory chips.
    There is no problem ... up after game load) and memory test programs says that everything is ...
    lillaolle64 lillaolle64 August 2010 Hardware
  • Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…

    ... which also have had upper memory problems and the diagnostic ... . After changing faulty upper memory chips they have worked fine.
    memory chips and few other chips. Maybe one of these other chips ... is Issue 4S and upper memory chips are TM4532.

    ...
    lillaolle64 lillaolle64 October 2010 Hardware
  • ZX Spectrum 48K,issue two - can't get it repairedI have an issue 2, which has some weird very small PCB hanging over the Z80. Some wire go to various places on the big PCB, two go to connections 36 …

    ... LEDs which chips are dead.
    Test 1 = ok
    Test 2 = ok ...
    Test 3: LEDS ... 4 times)
    Test 4 = ok
    Test 5: LED's 3 ... />
    I removed all lower memory chips, inserted sockets, and pushed in ...
    georgedb georgedb January 2011 Hardware
  • ZX Spectrum 48K, issue - works fine till it gets hot (?)ZX Spectrum 48K, issue 2, works just fine, tested with Winston's diag board. At a certain moment in time however, it seems to run hot and stalls. Whe…

    ... diag board claims low memory problems and the ZX ... right voltages on the lower memory chips (+5V, +12V, -5V).
    ... the culprit? The lower memory is 100% ok, works ... for other working lower memory, I get the same ... to replace? Any specific test I could perform?
    georgedb georgedb January 2011 Hardware
  • Spectrum 48K - upper memory MIAI have recently acquired a ZX Spectrum which, according to the sticker on the bottom, should be a 48K model. It's an Issue 3 board, with upper memory…

    ... Issue 3 board, with upper memory chips (8xTI4532) and supporting logic (U23 ... does not see the extended memory. PRINT PEEK 23732 + PEEK 23733 ...
    unholy unholy February 2012 Hardware
  • Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…

    ... ZX Spectrum uses 4116 memory for the lower memory, which can be ... but when searching for 4116 memory, what speed in nano seconds ... refreshed, the contents of the memory will get lost? 15ns? ...
    Same for the upper memory:
    TMS4532-3 Texas Instruments ...
    georgedb georgedb August 2016 Hardware
  • Help with a TIMEX TC2048 and memory problemBought a 2nd hand Timex TC2048 but unfortunately I detected a problem with the machine which is preventing it from working properly. I believe it …

    ... a fault with the upper memory (chips U8, U9, U10 or ... removed the old chips, placed sockets, inserted new memory chips and the result ... br />
    If I place memory chips U8+U9 I get 40959 ... />
    Is this a memory addressing problem? The machine doesn ...
    Renegade Renegade December 2017 Hardware
  • Strange +2 problem with DivMMC future on a few gamesHi all, Sorry, another question! As mentioned I have recently got my beloved grey +2 spectrum back from being repaired and serviced. Its had a…

    ... fixed on it (2x dead memory chips amongst a few things).
    test tool for a +2 to ...
    AD-RS1600i AD-RS1600i June 2019 Hardware
  • Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…

    ... 't you just go and test it and then contribute the ... of the harder things to test, and I can't believe ... the Z80 to a few memory chips or (indirectly ?) to the LPT ... short machine-code programs to test what's needed...

    GOC GOC July 2004 Development
  • Help! +3 won't work anymore!I've just set up my old +3 and it just won't work - it used to a few months ago but now it won't :( I'm in need of some expert help so here's the pr…

    ... new +2a
    - memory chips were okay
    - rom chips were okay
    test it. I have tried to find TEA2000 chips but ...
    Timppa Timppa August 2005 Sinclair Miscellaneous
  • Switch to 48mode without 'SPECTRUM' commandIs there a poke(s) to switch to 48 mode without SPECTRUM command. I want my tape loaders to switch automatically. I know how to switch ram banks ok…

    ... before I got 48k upgrade memory chips for Christmas. I thought I ... the memory chips and typing in a huge listing to initialise/test it ...
    FrankT FrankT September 2005 Sinclair Basic
  • Anybody fancy coding this?blah de blah de blah Please ignore, poting error.

    ... my posession three failed 4116 memory chips from two Spectrums that I ... memory locations getting influenced). My final memory test is a pseudo-random fill test ... - the entire memory bank is ...
    Winston Winston April 2007 Development
  • 48K Speccy not workingHey, A few months ago (hope it&#180;s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…

    ... one of the 4116 lower memory chips has failed. That's the ... the voltages to the 4116 memory to verify the Speccy's ... power supply to the 4116 memory:

    Put your ... of the 4116 RAM chips.
    Then test the following pins:
    memory.
    Winston Winston May 2007 Hardware
  • Spectrum ULAHi new to forum ,and have been a speccy owner/fan since the begining{like most 30 somthins on this forum !) Anyway what i want to know is the ULA th…

    ... to take one of the memory chips off the issue 2 and ... possible to buy the correct memory chips for the issue 2 anywhere ... do a PEEK/POKE test on the 16k chips?

    Haveing ...
    MARKZX MARKZX July 2007 Hardware
  • Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …

    ... I thought it was a memory problem, since i tried ... So i removed all memory chips and installed chip beses ( ... I bought five 4864 chips from sintech recently just ... test the faulty one's chips.
    After testing the chips ... it could be a memory controller chip so ...
    Martin Baugh Martin Baugh November 2007 Hardware
  • issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…

    ... : your simple test program will not find defect memory bits that are ... accomodate different
    brands of memory chips. What would happen when 'fast ...
    roko roko March 2009 Hardware
  • Two dead SpectrumsHi all, Long time since I posted on here. I'm having a bit of a clear-out, and I've re-discovered two Spectrums I had in the loft : One is an orig…

    ... 12v supplies to these chips. Then test that you've got ... or more of the chips in lower memory (the 4116 RAM ... can have to get chips out. Gently warm the ... - then ease the chips out with long tweezers ... />
    which will test memory, and do some functional checks ...
    Winston Winston August 2009 Hardware
  • 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…

    ... machine has sockets on upper memory chips, two multiplexers, the 74LS00 ... else changed the jumper to test if that worked.
    ... with a test program specially written to test the low memory bank. It ... 's a very simple test, which ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • Speccy repairs?I've finally got round to testing all the various Spectrums that I seem to have accumulated over the years and discovered that "my" two machines (i.e…

    ... RAM. Without running a test ROM it's difficult ... a test ROM then if only one or two chips ... the voltages are present, 4116 memory needs three voltages - +12v ... use a multimeter to test. If not all of ... actually kills the lower memory chips, the TMS4116 data sheet ...
    Winston Winston August 2010 Hardware
  • Broken +3I have noticed that some members on this forum prefer to repair Spectrums instead of just buying another one from ebay. I would like mine fixed at so…

    ... pattern on screen. Now the test: remove the wire from the ... .

    If not, the test is inconclusive, as there would ... or not, try this second test:

    Remove both ROM ... mod"). Then, remove the four memory chips, and start trying them, putting ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... , you have to determine which memory chips are faulty. If you can ... 're unable to do that test because your computer does not ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
<1234567…34>

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