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Search Again :: Adv Search 1000 results in 0.020s
<1234567…34>
  • Ram test / diagnostic software for 128k?I need a ram test program urgently (as I have to bring this machine into the party place tomorrow) yet I couldn't find any in infoseek by typing "ram…

    I need a ram test program urgently (as I have ... infoseek by typing "ram test" :) And most of the test suites based on ... .

    Are there any ram test suite which runs from ...
    Arda Arda December 2012 Sinclair Miscellaneous
  • 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)…

    ... assign the first K of ram to video memory and the rest ... is accessing the higher order ram (> 16K) the ULA (or ... is when writing to the video memory, beautiful :) So using the ... chip only needs 1K of video memory and the second chip ...
    Robin Robin January 2011 Hardware
  • 128K+2A/+3 RAM layoutDoes anybody know how physical RAM is mapped to ZX 128k+2a/+3 address space ? There are four 64Kx4 chips IC4-IC7. IC4-IC5 seems to be contended (vide…

    Does anybody know how physical RAM is mapped to ZX 128k+ ... to be contended (video RAM). It would mean RAM banks 4-7
    RAM test program, can be on ROM ...
    kpuchatek kpuchatek July 2011 Hardware
  • Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …

    ... that device is a 128K RAM test firmware.

    ... When I run the test, the screen border colour changes ... RAM page 5 has an issue.

    Here?s a video ... as well since the test doesn?t seem ... see the problem with composite video either...]

    CRNorris CRNorris February 2015 Hardware
  • Sinclair Spectrum System Test Rom CartridgeSinclair Spectrum System Test Rom Cartridge. [url="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=50224&item=8106735040&rd=1&ssPageName=W…

    Sinclair Spectrum System Test Rom Cartridge.

    [url=" ... Test, a Sound Test, a Colour Test, a Flash Test, a RAM Test and a Soak Test ... interpret the results of each test.

    The cartridge itself ...
    wadsterboy wadsterboy May 2004 Sales
  • ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…

    ... which is probably normal since ram
    test takes a bit more ... like 1 PRINT
    "test" - it works. But if ...
    Then I did a test where I moved the RAMTOP ... I did a small memory test program above RAMTOP like ... get a long memory test and couldn't enter ...
    Tom-Cat Tom-Cat September 2005 Sinclair Miscellaneous
  • RAM Test ROM?Found a link to this: [url]http://www.retroreview.com/iang/TestSpec4.zip[/url] in another thread, and fired it up in SPIN, but I have no clue how to…

    ... this to determine which physical RAM chip needs replacing, and/or ...
    trellis trellis September 2006 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…

    ... . I also did the composite video mod as troubleshooting this using ... />
    So on to the RAM test, there are two types, short ... Interface 2 which has a RAM test, the original fault when I ... FFFF and the short ram test failed with "RAM Error @8000 BTS 8 ...
    Womble Womble August 2010 Hardware
  • Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …

    ... , I had to assume this RAM test was regularly finding a problem ... this test did not decrement a value to zero, the RAM-READ ... highest working RAM location.

    I repeated this test about a ... the memory test successfully went a good way into upper RAM. I ...
    Zorn Zorn April 2012 Hardware
  • TESTROM3 - utility/rom for test your ZXHere is TESTROM3 utility as 16kB ROM file + flasher for install this rom to divide eeprom (or mapram mode). Work also on ZX Spectrum without ROM and …

    ... basic with enable 128kB ram)

    TEST 128kB MEMORY
    =================
    test of all 8 ram pages (during test sign in ... /> TEST FAST RAM
    =============
    Test only fast ram memory (32768-65535). During test show ...
    velesoft velesoft August 2012 Sinclair Miscellaneous
  • Issue 2 problemHeres a video of what happens when I fire up an Issue 2 board ive had hanging around for ages, this is with Paul Farrows RAM test cart in btw If this…

    Heres a video of what happens when I ... , this is with Paul Farrows RAM test cart in btw
    If ... spares but if its lower RAM ill give it a go ...
    Macc Macc November 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…

    ... after power on non video on Rf or CVBS but ... hot...

    Two ram chip (IC28 and IC30) are ... I will do some test with the "RAM test ROM"...

    ram chips... but with my ... replacement for the two dead ram...

    thanks ...
    emilen72 emilen72 April 2013 Hardware
  • Rubber Key RAM - Repair?Hello there everyone! I'm a long-time lurker on here - ROMs, documentation etc. but yesterday I finally ponied up for my own speccy, just like the on…

    ... />
    I carried out the RAM test I found elsewhere on this ...
    KenDoddsDad KenDoddsDad August 2013 Hardware
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ... (incl. Speccy) do a RAM test
    at startup. By ... table before
    the RAM test / it will get overwriten. ... . What if we replace RAM checking
    code with ...
    0x11EA JR Z,test)_2 ; bad value (zero ... "real HL" (where mem test ended)
    0x1203 LD DE ...
    tstih tstih July 2014 Development
  • Seriously weird Issue 2 issue... (RAM-related)Hi guys; I have been trying to fix up my Issue 2 and have run across a bizarre issue that I haven't seen elsewhere in the forums. Hopefully one of …

    ... /> 2. MEMCHK returned 32767, upper RAM fault. UPRAM85 returned 93, so ... "black screen and red bars" RAM test appears, after which the black ...
    Trafferth Trafferth August 2014 Hardware
  • I broke my 48k Speccy!!!!Hey guys, I am looking for some advice, I hope you can point me in the right direction. So, I went about replacing all the capacitors on my issue 4…

    ... The voltages on the lower ram are well out of whack ... with the initial start up test video from Zigg.net. Except, ... the 125 point in the video and continued until it ... over limit. In the video it should peak at about ... have issues with my lower ram now due to the ...
    RSwipeCA RSwipeCA December 2014 Hardware
  • Power issues on a 6A 48 K SpectrumHello all! I decided to take another look at my 6A Spectrum that I broke via a bad joystick adapter, I’ve removed the bottom 16K ram and replaced…

    ... following the “Initial Tests” video, it looks like I ... />
    [b]Regulator test:[/b]
    The left hand ... at 200 K, the video says 125 @ 400K and ... .

    [b]RAM test:[/b]
    previously I was ... />
    [b]TR4 Test:[/b]
    This seems wrong ...
    Korinel Korinel November 2015 Hardware
  • Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…

    ... with the upper RAM however on running the soak test on the ... minutes. I also performed the RAM test detailed here http://www.worldofspectrum ... suggestions? Soak test for longer or look for non-RAM related issues?
    britain4 britain4 October 2016 Hardware
  • Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…

    ... shimmering patterns. It passes a RAM test though and doesn't appear ... off display. I grabbed a video of it as you'll ... now after swapping all that RAM about? But it seems to ... ROM kicks in on the video is the most obvious of ...
    Jet5y Jet5y November 2016 Hardware
  • Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…

    ... version of Balford's ram test diagnostics said the whole ... removed all the upper RAM ICs, replaced with sockets ... />
    Given the lower RAM used to be okay, and ... The soldering & sockets test okay with the meter, ... of the data lines test as around 12k to ...
    Paulcatchpole Paulcatchpole December 2016 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…

    ... can be replaced with static RAM![/quote][LIST]
    [*]Power ... also the +5 to test the supplies? I did ... go. Especially with lower RAM, some video effect might be lost ... in no way an "video effect expert", but if ... [*]My own idea for a test DB would be one with ...
    Marcelo Marcelo March 2007 Hardware
  • Test ROM Cartridge For SaleI'm selling another load of gear including a Sinclair Research Test ROM Cartridge. [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=4000772…

    ... Test.
    This test loads a routine into the 16K video RAM ... an arcade game in the video RAM. This has been known ... br />
    6. The RAM Test.
    The RAM Test tests every location with ... that the RAM refresh is not functioning properly - test blocks are ...
    murtceps murtceps October 2009 Sales
  • zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…

    Without the ULA you'll see nothing, because it generates the video. If you see the black rectangle with red lines, at least partially, it means the CPU starts and trying to perform RAM test. For me, it looks more like RAM failure.
    Shiru Shiru October 2010 Hardware
  • 2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…

    ... />
    well the ULA and video circuits are ok at least ... and crashing partway through the ram test.
    guesser guesser March 2011 Hardware
  • 2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…

    [QUOTE=guesser;516988]well the ULA and video circuits are ok at least. Looks like it's starting to boot and crashing partway through the ram test.[/QUOTE]

    Just what I feared... RAM problems... :-(

    What can I do to test it?
    Diogo Diogo March 2011 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... (black and blue bars to test video ram), and then it resets instead ...
    Johan1973 Johan1973 August 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…

    ... an old pcb, look this video here [url]http://www.youtube ... no necessary to remove all ram ic's from 17-24 ... 3 compoments above and put ram test rom, take a picture to ...
    xaris_sm xaris_sm April 2013 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…

    ... 2 after power on non video on Rf or CVBS but ... I will do some test with the "RAM test ROM"...
    I ... now want remove the two ram chips... but with my ... replacement for the two dead ram...
    thanks to all ... and then change the hot RAM chips, WITHOUT TRYING TO ...
    Falco-F8L Falco-F8L April 2013 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…

    some little progress after rom ram test fitted in (with the two ... very hot ram installed)...

    this is ... the machine boot and video modulator work and video composite too..
    emilen72 emilen72 May 2013 Hardware
<1234567…34>

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