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Search Again :: Adv Search 1000 results in 0.007s
<1…11121314151617…34>
  • Wanted 6C001E-7 ULALooking to replace mine from a issue 4B, anyone got a working one spare in a bag of bits or know where I can get one?

    ... working one these on a faulty issue 4S board. It has ... board. I have tested the ULA on a issue 6A board ... worked fine on that. The ULA is socketed so is easy ... the board or just the ULA I could be tempted with ...
    Your Spec-chum Your Spec-chum November 2015 Wanted
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... address when accessed by the ULA. This causes chunks of ... can happen when the ULA is pulling an address ... Spectrums with a 5C112E ULA have this problem when ... Spectrum with a 6C ULA being affected, which I ... a handful of cases of faulty ULAs. I imagine because ...
    Zorn Zorn November 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... the ULA (via the transistor) or one of the DRAM chips faulty ... let you know if the ULA is good.

    [b ...
    1024MAK 1024MAK December 2015 Hardware
  • Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…

    ... the ULA (via the transistor) or one of the DRAM chips faulty ...
    Mysterion Mysterion December 2015 Hardware
  • So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…

    ... the ULA. So if the TEA2000 chip is removed, or becomes faulty ...
    1024MAK 1024MAK May 2016 Hardware
  • Spectrum issue 4SI have an almost completely depopulated issue 4s board. Wondering what to do, repairs or spares? I hooked it up and the voltages are off, 5v is fi…

    ... of circuit, and it was faulty. Strangely enough both TR4 and ... the rest of the board, ULA, ROM, Z80, LM1889 and most ...
    patzik patzik August 2016 Hardware
  • Magenta border and black screenGot my hands on a issue 3 48k machine. Did the initial resistance checks and everything seemed in order buy when I switch the machine on all I get is…

    ... mean that either the ULA is partly faulty, or there is a ... data being received by the ULA (from the Z80 CPU).
    1024MAK 1024MAK September 2016 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…

    ... BASIC BEEP command.
    The ULA uses the same pin for ... / sound out circuit can become faulty. This can affect loading, saving ... /> It's possible that the ULA has developed a fault, but ... as there are no new ULA chips to buy, it's ...
    1024MAK 1024MAK October 2016 Hardware
  • Magenta border and black screenGot my hands on a issue 3 48k machine. Did the initial resistance checks and everything seemed in order buy when I switch the machine on all I get is…

    ... out it was the ULA that was faulty. Replaced it with another ... curious as to why the ULA has failed. Is thier any ...
    BruceNorton BruceNorton October 2016 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…

    ... BASIC BEEP command.
    The ULA uses the same pin for ... / sound out circuit can become faulty. This can affect loading, saving ... /> It's possible that the ULA has developed a fault, but ... as there are no new ULA chips to buy, it's ...
    britain4 britain4 October 2016 Hardware
  • Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…

    The ULA chip is nearly squared and marked as IC1 (Amstrad 40077). I would install the good board inside this casing and cannibalise the faulty board. Don't do other way around as you might end up with two broken PCBs.
    Claudius Claudius February 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... think that the ROM was faulty. The ULA of course is nice ...
    Mikelone Mikelone April 2017 Hardware
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... was sold as a "bit" faulty but I could not see ... PCB was socketed except the ULA .All in all , It looks ...
    harriusherbartio harriusherbartio April 2017 Hardware
  • The "Big Issue" about the ZX 48K rubber key Spectrum . Which Issue is best? There is no easy answer as every 48k rubber keyed Speccy owner will have their own favourite so it will be pretty subjective . But my favourite a…

    ... (A/B/S) had a faulty CPU, if I remember correctly ... one fixes the problem.) The ULA, however, is much improved and ...
    Ast_A_Moore Ast_A_Moore April 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... approx (depends on if the ULA thinks the address is contended ... reset button. If either is faulty, the Z80 CPU will not ...
    1024MAK 1024MAK April 2017 Hardware
  • Joystick IssuesHi guys, I'm having a few issues getting joysticks to work well on my Spectrum 128k. I've got a Power Play Joystick interface and I've tried it with…

    ... a dirty edge-connector or faulty interface) to supply the real ... the current byte that the ULA is reading from the screen ...
    1024MAK 1024MAK July 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... a lot of work. The ULA will also run warm. As ... never as hot as the ULA).

    The ZTX651 is ... the 4116 DRAM may be faulty). If this is the case ...
    1024MAK 1024MAK August 2017 Hardware
  • Spectrum repairs[edit - sorry! wrong section, if someone can move please] I'm in contact with a seller on Gumtree. He was selling a 48k Spectrum, fully boxed and…

    ... (could be just a single faulty chip), but it could also ... be a fault with the ULA.
    Or it could be ...
    1024MAK 1024MAK August 2017 Hardware
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... may be affected by the ULA reading screen data at the ... , the Spectrum is actually a faulty 48k working as a 16k ...
    1024MAK 1024MAK August 2017 Development
  • Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…

    ... is faulty, or the ULA is faulty.
    Is the ULA in ... , do you have another ULA (any working 16k/48k ... you can test the suspect ULA in?
    Before ... changing the crystal or the ULA, it is worthwhile checking ... can't swap the ULA with another machine, first ...
    1024MAK 1024MAK August 2017 Hardware
  • 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…

    ... repair. Yes there maybe some faulty lower ram IC's, but ... don't rule out any faulty upper ram IC's either ... packaging and most-likely-good ULA as the main draws.
    Kamineko Kamineko September 2017 Hardware
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    ... thinking it's the ULA that is faulty. Problem is, this is ... the smd type ula, it will ...
    patzik patzik October 2017 Hardware
  • 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…

    ... would suggest trying the ULA from this faulty board in a known ... just to confirm if the ULA is okay. 'cus if the ... ULA has failed, there is not ... from the ROM, or the ULA is faulty.

    If you ...
    1024MAK 1024MAK October 2017 Hardware
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... :[/u][/i][/b]
    "The ULA is mostly functional (it reads ... , so I assumed this was faulty. I will do some continuity ... ROM and Z80 and the ULA & Z80 once I find ...
    dozey_dustman dozey_dustman December 2017 Hardware
  • Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…

    ... at the time it was faulty with my own thinking and ... found a fault with the ULA. No sound it's totally ... fine. It that common on ULA's? I will post some ...
    Your Spec-chum Your Spec-chum July 2018 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... ram chips can be faulty, or the ULA. Anyway not looking for ...
    dmsmith dmsmith August 2019 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... ram chips can be faulty, or the ULA. Anyway not looking for ... booted if the Spectrum has faulty ram IC's. The diagnostic ... will identify which IC is faulty making fault finding a breeze ... ]

    And regarding the faulty eBay Spectrum. If the seller ...
    Your Spec-chum Your Spec-chum August 2019 Hardware
  • Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…

    ... . If the PSU circuitry is faulty, you can have a multitude ... ’s likely that the Z80, ULA, and ROM are okay, but ... only remaining fault was a faulty keyboard membrane.

    [b ...
    1024MAK 1024MAK August 2019 Hardware
  • Keyboard (simultan pressed keys) Test Program in MCode like Vyacheslav Strunov´s Port demo v3.1Anybody here knows of another good Keyboard Tester program (for simultanous pressed keys and in Machinecode) like this: Port Demonstration 3.1 by Vy…

    ... is what Chris Smith's ULA book says about it[/quote ... program reading all keys was faulty, but as Vyacheslav Strunovs Port ...
    Luzie Luzie November 2019 Hardware
  • "Self Isolation" and Speccy PCB repair"These Days" of "home self-isolation" , particularly on rainy days , I reckon I will have more time to hone my Speccy PCB repair skills which are s…

    ... connector) .I think it was faulty as it crashed the screen ... to the right of the ULA seemed to clear up the ...
    harriusherbartio harriusherbartio April 2020 Sinclair Miscellaneous
<1…11121314151617…34>

Latest Posts

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