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<1…19202122232425…34>
  • It's fitting...... that in the very month that the 25th anniversary of the Speccy falls on, I'm just finishing up making my first ever Spectrum peripheral. It's a …

    ... 74LS244 very nicely for a PCB (so I always used LS245s ...
    Marcelo Marcelo April 2007 Hardware
  • Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…

    ... enable. (I may update the PCB layout so that M1 can ...
    Winston Winston April 2007 Hardware
  • ZX81 - 64mb queryI know this is a spectrum forum but hopefully someone out there may know the answer to my question. I buy and sell old sinclairs and have sold numer…

    i now have a pretty good photograph of the pcb showing the mod, is there anyway i can post the picture in this thread ?
    Fazz Fazz April 2007 Hardware
  • ZX81 - 64mb queryI know this is a spectrum forum but hopefully someone out there may know the answer to my question. I buy and sell old sinclairs and have sold numer…

    Thanks guys - It just looks completely different to any other zx81 pcb ive seen.

    So its a standard 1K factory issue zx81 ?
    Fazz Fazz April 2007 Hardware
  • Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…

    ... enable. (I may update the PCB layout so that M1 can ...
    Marcelo Marcelo April 2007 Hardware
  • NMI : especially PitersHello Piters, here the link to your NMI-button. [url]http://members.tripod.com/~piters/nmibutto.htm[/url] I don't understand your reason to place …

    ... | | | |--o-|__|-+--O -> To PCB GND
    | |==| |
    |_ ... ____|--o---------O -> To PCB -NMI
    [/code] ... /> | | | |--o---------O -> To PCB GND
    | |==| |
    |_ ... ____|--o---------O -> To PCB -NMI
    [/code]Er ...
    Marcelo Marcelo April 2007 Hardware
  • NMI : especially PitersHello Piters, here the link to your NMI-button. [url]http://members.tripod.com/~piters/nmibutto.htm[/url] I don't understand your reason to place …

    ... |
    | | | |--+-|__|-+--O -> To PCB GND
    | |==| |
    |_| ... |____|------------O -> To PCB -NMI
    [/code]Marcelo.[/QUOTE ... floating' aside (free from the PCB, but in the case of ... wires to connect to the PCB. This can be a ...
    Dr BEEP Dr BEEP April 2007 Hardware
  • GrrrThere's nothing more annoying than finding out that you've managed to bridge /RAS and A3 on the bank of 4116s while putting in sockets. Naturally, th…

    ... (which is flush with the PCB) on the component side rather ...
    Winston Winston April 2007 Hardware
  • GrrrThere's nothing more annoying than finding out that you've managed to bridge /RAS and A3 on the bank of 4116s while putting in sockets. Naturally, th…

    ... the sockets out of the PCB this way with my paint ...
    Dr BEEP Dr BEEP April 2007 Hardware
  • GrrrThere's nothing more annoying than finding out that you've managed to bridge /RAS and A3 on the bank of 4116s while putting in sockets. Naturally, th…

    ... -drill the holes in the PCB with a 0.8mm drill ...
    Winston Winston April 2007 Hardware
  • Need advice choosing one of these optionsA few spanish friends are willing to help me build and program the ethernet interface for the Speccy. Here are the possibilities. Any advice would be…

    ... little more space on the PCB.

    But doing it ...
    Winston Winston April 2007 Hardware
  • Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…

    ... a slight tweak to the PCB layout to accomodate another jumper ... 's clock!)

    The PCB layout is designed so it ... who's made their own PCB. It is double sided, but ...
    Winston Winston April 2007 Hardware
  • RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…

    ... time and equipment to make PCB for it.
    But, if ...
    piters piters April 2007 Hardware
  • Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…

    ... pin jumper block to the PCB layout for 'use M1 / don ...
    Winston Winston April 2007 Hardware
  • RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…

    ... time and equipment to make PCB for it.
    But, if ...
    beanz beanz April 2007 Hardware
  • RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…

    Sounds like a good place to get my thru port PCBs made :) Thing is, no holes in a thru port PCB :( Will they accept black and white 1:1 artwork?
    DEATH DEATH April 2007 Hardware
  • A great ideaMost of us are a bit short on cash whenever we want to buy a new toy for our speccy. Sometimes can't even find what we are looking for. Now what id s…

    ... expensive (i.e. getting the PCB manufactured and the chips put ...
    Winston Winston April 2007 Hardware
  • Personal Gaming History in (very) Brief'79:PrinztronicMicro5500 --> '80:PlayedCoinOp(Space Invaders) --> '83:Spectrum(48K) --> '84:Spectrum+(kit) --> '86:Spectrum128 --> '88:AtariST --> '9…

    ... /> MB Vectrex
    ~2002: JAMMA pcb's* (World Cup 90, Aeroblasters ...
    Megatron-UK Megatron-UK April 2007 Games
  • The Unofficial Official 25th Anniversary celebrations and Website announcement threadAs Martijn's going to be away during the festivities, can people report what they're doing here please, as and when they have something to announce. …

    ... contant with and cross several pcb wires.

    Ok, I ...
    Alcoholics Anonymous Alcoholics Anonymous April 2007 Sinclair Miscellaneous
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... of rework on a Spectrum PCB it's also worth checking ...
    Winston Winston April 2007 Hardware
  • problem with sinclair zx 48 issue 6aHi all, I have the following problem when I turn on my sinclair without rom inserted. [url]http://217.79.64.145/sinclair/5.jpg[/url] when I turn o…

    ... have been burned and in pcb I've seen big voltages ...
    gorski gorski April 2007 Hardware
  • Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…

    Excellent work!

    I was hoping to get my project out the door by today but real life happened. I should really get on with laying out the PCB soon.

    --Dave
    dtl dtl April 2007 Hardware
  • Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…

    Many thanks Winston as I do not have access to a Laser Printer, I am constructing a UV Light Box to make the PCB.
    Martin Baugh Martin Baugh April 2007 Hardware
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... the current taken by the PCB?

    Easy to just ...
    DEATH DEATH May 2007 Hardware
  • Is Ferranti still alive ?And if not......why should there be any restrictions on manufacturing the ULA ?

    ... [/] should be able so make PCB's.

    I'm ...
    Pilsener Pilsener May 2007 Sinclair Miscellaneous
  • Is Ferranti still alive ?And if not......why should there be any restrictions on manufacturing the ULA ?

    ... , and if you keep the PCB size down (since you've ...
    Winston Winston May 2007 Sinclair Miscellaneous
  • Problems with TS2068sI bought 2 TS2068s, and this is what's happening: 1st computer: -The tv output doesn't work. The composite video output does* -The '7' key is dead.…

    ... variable resistors on the 2068 pcb that were adjusted at the ... bottom left corner of the pcb. Now that you've mastered ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Hardware
  • Problems with TS2068sI bought 2 TS2068s, and this is what's happening: 1st computer: -The tv output doesn't work. The composite video output does* -The '7' key is dead.…

    ... membrane. Instead they have a pcb, so you are in luck ... have access to the KB pcb. The keyboard matrix has copper ...
    odious odious May 2007 Hardware
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    ... creating decent pictures of 128k PCB. Here is the link:
    PCB) like someone has tried to ...
    netomc netomc May 2007 Hardware
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    ... /> Hi Gods
    Thanks for PCB image and that ULA looks ...
    netomc netomc May 2007 Hardware
<1…19202122232425…34>

Latest Posts

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