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Search Again :: Adv Search 1000 results in 0.056s
<1234567…34>
  • Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…

    ... (all test ok) as per Zorn's video and am currently replacing ... another working ULA and it's not that...

    Update ...
    OttO OttO December 2013 Hardware
  • ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…

    Just a quick question to Zorn (amongst others).

    What ... be with fitting one of Zorn's RAM boards into an unexpanded ... of the official RAM pack's internal circuitry is to generate ... 4116 chips.

    Since Zorn's board only needs 5 volts ...
    DEATH DEATH October 2014 Hardware
  • Memory testersHi, Just wondering which software people are using to test the memory in their spectrum. I have been using Zorn's memory tester as described here:…

    ... spectrum. I have been using Zorn's memory tester as described here ... -a-48k#latest

    (Zorn's hosting has since disappeared, but ...
    vext01 vext01 July 2015 Sinclair Miscellaneous
  • Grey +2 SRAM module - any interest ?In the same vein as Zorn's RAM replacement modules, I designed a board that replaces a bank of 8x4164 RAM IC's as used in the Grey +2 with a modern S…

    In the same vein as Zorn's RAM replacement modules, I designed ... bank of 8x4164 RAM IC's as used in the Grey ... />
    I realise that 4164's are still fairly easy to ... load of seperate IC's.

    Here's a picture of ...
    Peter Mulholland Peter Mulholland May 2016 Hardware
  • How the DC-DC converter worksI've not seen this before. The DCC-DC converter inside the Speccy has always been quite a mistery for me: [url]http://www.tablix.org/~avian/blog/arch…

    Thanks Ingo, I must bow for the master. Your explanation makes Zorn's observations about different wavepatterns most likely.
    roko roko May 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…

    Ah ha! Zorn you legend!


    [ ... work like that? I mean, Zorn's program was not poking 85 ...
    vext01 vext01 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…

    ... . With the new ram chip, Zorn's memory checker gives no errors ...
    vext01 vext01 October 2012 Hardware
  • Tape loading from PCSo, I found that I had been using the wrong audio jack socket on my 48k for tape loading (my spectrum is in a third party case, so there are not labe…

    Thanks for everyone's advice so far.

    ... have built the cable to Zorn's specifications, but that alone is ...
    vext01 vext01 October 2012 Hardware
  • Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …

    ... investing in a stack of Zorn's replacement Lower RAM boards in ...
    Simon_Carr Simon_Carr June 2013 Hardware
  • 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…

    Bought one of these from Zorn's eBay shop; it arrived this weekend. Nice piece of kit! :) Will be using it to help diagnose my poorly 16k Speccy later this week!
    Trafferth Trafferth July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... for the late update - it's been crazy at work this ... of the 4116 chips for Zorn's excellent lower ram replacement module ... -cosmetically-matching one, but that's not so much of an ...
    Trafferth Trafferth July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... />
    So... I have replaced Zorn's module with some 4116s and ...
    Trafferth Trafferth July 2013 Hardware
  • ZX Spectrum 48K working as 16K from factoryGood morning I Have a Zx Spectrum 48k working as 16K , it came like this from factory. What can i do to solve this , and put it to work as 48K? Wha…

    Maybe it's just my perception, but IC19 ( ... the rest - suggesting that it's been replaced in the past ... .

    The tests that Zorn's provided will hopefully be able ...
    balford balford July 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... point I'd be putting Zorn's replacement 4116 module back in ... properly.

    If it's stable with the lower RAM ... 'd find some new 4116's to pop in as replacements ...
    balford balford August 2013 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... wasn't a stripe with Zorn's module in place. I have ...
    Trafferth Trafferth August 2013 Hardware
  • First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…

    ... one or more DRAM chip(s). But only change on failure ... I am fitting one of Zorn's SRAM modules).

    Good ...
    1024MAK 1024MAK October 2013 Hardware
  • One more grey +2 with video problemsI guess I need your help again to hopefully be able to do some proper troubleshooting myself one day. Here I have a grey +2, which could be a bottom…

    ... the coil as shown in Zorn?s 48K video. The outer positions ... .php5?title=Replacement_Components[/URL]), there?s only the 48K and the ...
    schombi schombi October 2013 Hardware
  • My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…

    ... a number of modifications, including Zorn's lower and upper RAM module ...
    balford balford January 2014 Hardware
  • My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…

    ... a number of modifications, including Zorn's lower and upper RAM module ... was issue 5, but it's just a little bit of ...
    Hairy Hairy January 2014 Hardware
  • Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…

    ... the speccy!

    Here's a shot of me loading ... composite mod while waiting for Zorn's new memory modules to arrive ...
    namtip namtip January 2014 Hardware
  • 48k Missing D15Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing …

    Yes - it's missing the power converter mod ... all resistances in accordance with Zorn's video on the subject. If ...
    balford balford February 2014 Hardware
  • 48k Missing D15Got a 48k here that is missing D15 (just below right molex connector), someone removed it in the past, only just noticed it was gone after replacing …

    Ok, so here's what I'd do at ...
    - replace TR4
    - Do Zorn's resistance check, if this fails ... coil
    - Start removing 4116's until the resistance checks pass ...
    balford balford February 2014 Hardware
  • Cooler padI have this cooler pad that prevents an old laptop from getting overheated like hell. It is powered by plugging it to the usb port. I don't have a sp…

    ... lower and upper RAM with Zorn's memory modules
    - Replaced all ...
    balford balford February 2014 Hardware
  • Grey +2 DiedHi all, Thrashing my +2 playing Mugsy last night and it did this... [URL="https://m.flickr.com/photos/83515822@N05/13012551693/lightbox/"]https://m…

    ... .youtube.com/watch?v=IzgCmldm2H4"]Zorn's resistance checks[/URL] first, then ... / layout and replace RAM IC's as needed;
    [*]If no ... results are obvious, then it's out with the oscilloscope. At ... is a basic list, and Zorn / 1024MAK / DEATH are by far ...
    balford balford March 2014 Hardware
  • Another "untested" dead spectrum...Hi, I'm looking for some suggestions on a faulty Spectrum I have picked up. I'll need to wait until tomorrow before posting pics, but the screen is …

    ... lower.

    Go with Zorn's advice, lower RAM is suspect ...
    DEATH DEATH March 2014 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... a crack at fixing - it's currently sitting on the tinkering ... . Notes: replacing the 4116 with Zorn's awesome RAM replacement module works ... regulator gets hot, but that's normal I think. Coils buzz ...
    Trafferth Trafferth April 2014 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... using Zorn's RAM replacement module works, but using different 4116's still ... fault with the socket that Zorn's RAM replacement module also uses ...
    1024MAK 1024MAK April 2014 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... the modern CMOS chips on Zorn's memory module, but is unable ...
    1024MAK 1024MAK April 2014 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... problem seems to be resolved. Zorn's RAM module still doesn't ... .

    Now, though.... IT'S HARLEQUIN ASSEMBLING TIME! YEAH! :D
    Trafferth Trafferth April 2014 Hardware
  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... beep to the speaker. It's almost a constant noise, but ... keypresses.

    2. (With Zorn's module installed): Speccy works fine ... .

    So... I think Zorn mentioned that symptom (2.) appears ... 32k yet.

    It's almost as though this Issue ...
    Trafferth Trafferth May 2014 Hardware
<1234567…34>

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