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Search Again :: Adv Search 1000 results in 0.025s
<1…22232425262728…34>
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... of the upper 32K of RAM and so the Spectrum initialises ... or more of the upper RAM ICs, IC15 - IC22. These can ... be easy as the simple check done by the ROM routine ... thorough (but far from perfect) RAM test program you could try ...
    Zorn Zorn October 2012 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... it's more complicated - your RAM chip has an addressing error ... you need to do is check what's affecting the memory ...
    Spirantho Spirantho October 2012 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... , +12V, place to check is on 4116 RAM IC's in lower ... needs lower RAM + video encoder to work), but DO CHECK! (especially -5V ... for this). 3) Run more RAM software tests to determine if ... the upper RAM.

    Watch ESD precautions, and check the various ...
    RetroTechie RetroTechie October 2012 Hardware
  • Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…

    ... test either all of upper RAM or just a small area ... of lower RAM. It stripes a random sequence ... then reads them back to check they are as was written ... most of the common Spectrum RAM faults.
    Zorn Zorn October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... the third pass of the RAM filling routine when reaching address ... />
    I still have to check the 74LS174 to see if ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... and TR6. All of them check O.K. A0 continuity is ... correctly its memory bank, all RAM chips are new and efficient ... ran out of something to check, and the Spectrum has still ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…

    ... the 5th or 6th general check of all lines, I ... bit 5 of the uncontended RAM bank was faulty, and ... the uncontended RAM pages could not be paged ... look for bad RAM chips in the contended RAM bank. This ... culprit was of course a RAM chip, but in the ...
    Falco-F8L Falco-F8L October 2012 Hardware
  • 48k faultyHi guys! I have a 48k that, currently, presents 2 problems: 1 - Can?t sync to TV correctly. I get a lot of noise and the characters appear to be inc…

    ... 7805 regulator too. When done, check supply voltages (+5, +12 and ... -5V) at the lower RAM.

    Only when that ...
    RetroTechie RetroTechie October 2012 Hardware
  • my first 48kHi I have just got my first 48k and I can't keep it tuned in. And when it is its not very clear. Moving text and switching to black and white. some …

    thanks for the reply. The video does not worry too much but the ram does. Any idea how I could check if its the case? If it is broke any clue on how to fix. really want this to work.

    regarding the video I do not know anyone who could do it. :(
    delaneya delaneya November 2012 Hardware
  • Spectrum 16K Issue 3Hi! I just received a Spectrum 16K, which turns out to be an Issue 3. Is it really that rare? If not, I?d like to upgrade it to 48K. There are 12 em…

    ... RAM in consecutive addresses, then read the values back again and check ... 're correct.
    Also, check with a Multiface (you do ... values in upper RAM and see if other RAM addresses change when ...
    Spirantho Spirantho November 2012 Hardware
  • Spectrum 16K Issue 3Hi! I just received a Spectrum 16K, which turns out to be an Issue 3. Is it really that rare? If not, I?d like to upgrade it to 48K. There are 12 em…

    ... RAM in consecutive addresses, then read the values back again and check ... 're correct.
    Also, check with a Multiface (you do ... values in upper RAM and see if other RAM addresses change when ...
    schombi schombi November 2012 Hardware
  • Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …

    ... stop it at msgpcc and check that what HL is pointing ... , but takes about twice the RAM of the routine above. Still ...
    snigfarp snigfarp November 2012 Development
  • ZX Spectrum + 2 128K - Video Issue?Hi All, I have just picked up a secondhand +2 and am having a problem with it. :( When I power the unit on and hook it up to my TV with the RF cable…

    ... ) and possibly a scope to check the signals at various points ... attention at finding the bad RAM chip(s) that make for ...
    Falco-F8L Falco-F8L November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... the lower 16K of RAM that has failed. Having ... />
    - Check the supply voltage to the lower RAM, make sure ... the pin-out).
    - Check to see if you find ... from radiated heat, but the RAM should not.

    RAM, remove all the chips ...
    Winston Winston November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    If the upper 32K RAM chips are socketed, try removing ... />
    But like Winston said: check supply voltages first.
    RetroTechie RetroTechie November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... for the replies. I will check the voltages tomorrow and see ... and skills to replace those ram IC's. I have other ...
    Your Spec-chum Your Spec-chum November 2012 Hardware
  • 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…

    The border turns 'white' (which I've read is done by the Z80), and it looks like a RAM test is being done. So if it's one of the causes you mention, I'm betting lower 16K RAM.

    Btw. did you check supply voltages?
    RetroTechie RetroTechie November 2012 Hardware
  • 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…

    Do the finger-test first, to check if any RAM-chip is hotter than the others.
    Pilsener Pilsener December 2012 Hardware
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ... ,$07 (Select ROM0 or 2, RAM 7)? Is it so important ... to make BASICLIS work to check if it is better, but ...
    Zup Zup December 2012 Games
  • Some stupid 16K questions...Starting with... 1. Should a 16K Spectrum that's been upgraded to 48K behave [I]exactly[/I] like a 48K Spectrum? i.e. should the machine test/clear…

    ... 48K machine. Sounds like faulty RAM (likely), or faulty logic (very ... straps to select the correct RAM type. Check these also. The Spectrum ...
    RST#08 RST#08 December 2012 Hardware
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ... , using the infy pokes, to check that they're all OK ... other consideration is the DOS/RAM buffer extents, initially occupying all ... their number & location, so RAM buffers can be set to ...
    Battle Bunny Battle Bunny December 2012 Games
  • Odd files on disk games (Op.Wolf, Typhoon, etc.)I've noticed on some disk games which I've been looking at recently that the loading sequence starts by loading two 512 byte files and comparing them…

    ... it crashes -- often by filling RAM like you're seeing.
    check. Though with a real disk ...
    obo obo December 2012 Games
  • +3 BASIC DOS_DemoI got side-tracked while working on the Op.Wolf conversion and ended up writing this +3 DOS utility which provides most of the disk functions that mi…

    ... n/a
    M=MEMORY CHECK b=line#, c=page, returns ... buffers,
    d=1st RAM buffer, e=qty RAM buffers
    U ...
    Battle Bunny Battle Bunny January 2013 Sinclair Basic
  • How to check the whole memory on a +2 greyHi everybody!!! I suspect that i have a bad memory chip on my +2 Grey. Does anybody know if exist any utility to check the whole memory? Thanks a …

    ... based on the memory check section of the ... ; Spectrum +2 (not +2A!) RAM test
    ; assemble & ... running in RAM it can't check the page ... [list=a]
    [*]"RAM pass, excluding page [2 or ... page x" (RAM I/O error)
    [*]"RAM fail: address ...
    Battle Bunny Battle Bunny January 2013 Hardware
  • Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…

    ... . There's indeed a way. Check this post earlier in this ... 16 bytes in its own RAM! There's space in ROM ... not sure how small the RAM chip is, but even if ... the RAM is at $2000–$20FF, there ... be plenty of space in RAM for an extra copy of ...
    zub zub January 2013 Hardware
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... />
    First check the voltages to the lower 16K RAM. Look up ... (especially -5v) the lower 16K RAM is definitely dead. You'll ... power supply before replacing the RAM though. (You can search this ... are present, the lower 16K RAM is probably still bad, but ...
    Winston Winston January 2013 Hardware
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... ? :)

    If it's RAM, the screen will be black ... possibility is TR6.
    Still check the +5V, +12V and -5V ...
    Spirantho Spirantho January 2013 Hardware
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... ? :)

    If it's RAM, the screen will be black ... possibility is TR6.
    Still check the +5V, +12V and -5V ...
    AussieZX AussieZX January 2013 Hardware
  • Zero 0.5 ReleasedAfter a bit of a hiatus, the next update of Zero is now available [URL="www.ramtop.wordpress.com"]here[/URL]. Feedback and bug-reports appreciated! …

    ... X2 64 6000, 4 GB RAM, Windows 7 64-bit SP1 ... intuitive. Generally you have to check all of the windows that ...
    Arjun Arjun January 2013 Emulators
<1…22232425262728…34>

Latest Posts

  • I am currently watching.....
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    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
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    rich_chandler on April 21
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    mel the bell on April 21
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    harriusherbartio on April 21
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    harriusherbartio on April 21
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  • +3 Disk drive motor
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