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  • Vic 20 game better than Speccy version?Years ago, when I had my Vic 20 I had a game called Blitz, it was on the welcome tape in fact. Very simple game, but strangely addictive. For those t…

    ... in A'F').

    ULA II support has been added ... not sure if I can fix this. It seems to be ...
    Alien 8 Alien 8 April 2010 Games
  • Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky

    ... ]
    True, but the DC input is already around 11~12V ... be more worried about the ULA, as it gets hot no ...
    RetroTechie RetroTechie April 2010 Hardware
  • What does this screen mean?Hi, I wonder if someone might be able to shed some light on what this screen means when powering up the machine: [url]http://i720.photobucket.com/a…

    ... went wrong.

    Btw: ULA seems to be generating an ... , and decide if he can fix it himself (from this story ...
    RetroTechie RetroTechie May 2010 Hardware
  • +3 ProblemsI have been having a few problems with my +3 and I am wondering if anyone can help or give me some advice: 1. I have 2 blank disks which I have save…

    ... the "switch TV to SCART input" when you switch on external ... resistor? In that case, proper fix would be: cut connection between ... appears a [I]proper[/I] fix might require opening up your ...
    RetroTechie RetroTechie May 2010 Hardware
  • damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…

    ... news: I'd suspect the ULA is still okay since it ... only source for a working ULA is another Spectrum.

    fix this, the old & fragile ...
    RetroTechie RetroTechie May 2010 Hardware
  • So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…

    ... between ULA's Z80 clock output, and Z80's clock input. Perhaps ... 14 MHz. signal that ULA takes as input - you could use some ... clocks which are synchronized with ULA. That could simplify clock switch ... divided clock - remember that ULA's clock output isn't ...
    RetroTechie RetroTechie June 2010 Hardware
  • So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…

    ... />
    [QUOTE]As for the ULA's clock output, it actually ... more than a Z80 clock input would draw but still not ... feed it to Z80 clock input (perhaps a simple resistor could ...
    RetroTechie RetroTechie June 2010 Hardware
  • testing if speccy is fully functionalHi, There is so much mention of T states but still confused. Does this mean if an instructin is out by a T-state or more then the speccy is faulty?…

    ... , and if the Z80 or ULA is likely dead (you can ... i/o bits on the ULA so you can check if ... testing for voltages, you can fix any speccy in not a ...
    Spirantho Spirantho June 2010 Sinclair Miscellaneous
  • Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …

    ... ?[/QUOTE]
    OK... I'll fix the delete auto-inc issue ... top doesn't accept any input. Have to enter a temporary ...
    ccowley ccowley June 2010 Announcements
  • 48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…

    ... ask.... what type was the ULA for the zx81 you bought ... get a friend to test / fix it for me
    fog fog July 2010 Hardware
  • 48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…

    ... fix (are these rare?).

    Unfortunately both have the 183 ULA ... replace them with the 210 ULA.
    gtsamour gtsamour July 2010 Hardware
  • Issue 2 issue (...)Just acquired an issue 2 Spectrum 48 K, selled as working board, not working keyboard. Before testing it with a psu I opened the case and discovered …

    ... happens if I don't fix the connection ? [/QUOTE]
    The ... patch is to pull the ULA pin IORQGE high (=invalid) as ... the address decoder for the ULA (=keyboard+border) which normally should ...
    roko roko July 2010 Hardware
  • ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…

    ... way to disable them is fix a control line to +5V ... & machine hangs), or an ULA that's faulty but not ...
    RetroTechie RetroTechie July 2010 Hardware
  • Issue 2 issue (...)Just acquired an issue 2 Spectrum 48 K, selled as working board, not working keyboard. Before testing it with a psu I opened the case and discovered …

    ... a board (that with 5c112 ula) is the same on all ... the 2 board without any fix, any great risk for this ...
    Cignale Cignale July 2010 Hardware
  • Cant DecideI have had a lot of spectrums in my time from the 16k to the +3 and as we all know they all have flaws. I am thinking about buying another and wanted…

    ... TC2048 is EAR path to ULA that was changing with each ... external.[/QUOTE]

    Or fix it up to use full ... decoding. There is no ULA in the TC2048. It's ...
    chev chev August 2010 Hardware
  • New stereo audio board for fitting on AY chip - interested?Hi, I developed a small board that fits on the AY chip inside 128K ZX Spectrums: [IMG]http://www.benophetinternet.nl/hobby/vanmezelf/stereo_audio.j…

    ... because of limitations of the ULA. The stripes are there to ... the sound of the EAR input of the Spectrum (or from ...
    ingo ingo August 2010 Hardware
  • External Tape / Audio Input on Spectrum +2AEvening all, I've just picked up a Spectrum +2A and have been trying to load TZX files from my Mac into the Spectrum. I know the leads and methods …

    ... 'll need to solder a fix for the sound on the ... stuff to allow external tape input to a +2.

    input.

    With the Spectrum ... +2 to give external tape input you need to be careful ...
    Winston Winston August 2010 Hardware
  • Spectrum hangs upWhat might be problem when my ZX Spectrum 48K (rubber keys) hangs up after few minutes play? It had memory problems but i changed (or an expert did i…

    ... related to the CPU or ULA (I don't think either ... ,254,24,246
    20 INPUT "Load address? ";d
    20 ... only, run this program and input 30000 for load address.
    input 49146 for load address (this ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • Schematics for loading amplifier?I'm interrested in making an external portable amplifier in order to be able to load speccy games using an mp3 player. I looked in the internet but c…

    ... is potential of destroying the ULA input I think!

    Greets ...
    ingo ingo August 2010 Hardware
  • Speccy repairs?I've finally got round to testing all the various Spectrums that I seem to have accumulated over the years and discovered that "my" two machines (i.e…

    ... to the left of the ULA until the colours are right ... : bad keyboard membrane (trivial to fix, since brand new ones are ... /> I've never had to fix a +2 before, but again ...
    Winston Winston August 2010 Hardware
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    ... about 2 years it died (ULA) although it was never 100 ... (despite my best efforts to fix back then, no internet resources ... shortly after the warranty period (ULA again, the square chip) so ...
    spider spider September 2010 Sinclair Miscellaneous
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    ... to +12v). Fortunately, the Ferranti ULA turns out to be quite ... in a bit of a fix today. I suspect some day ...
    Winston Winston September 2010 Sinclair Miscellaneous
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... bad design.

    Proper fix would be to take transistor ... produce that output for all input values. Then replace NANDs + transistor ...
    RetroTechie RetroTechie September 2010 Hardware
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... we want is that the ULA (=IORQGE) does not respond to ... /> In such case (one OR input low) the gate just acts ...
    roko roko September 2010 Hardware
  • Help with broken SpectrumHi There, Just received a ZX Spectrum computer. It's an issue 3B (48k version). When I power it up (9V centre pin -V) nothing happens. It's complete…

    ... ]average[/I] 'DC' voltage on ULA pin 32, Z80 pin 6 ... you can use composite video input on TV without need for ... things. Oh and pop the ULA out & re-socket it ... something. My gut says dead ULA but I prefer evidence... ;)
    RetroTechie RetroTechie September 2010 Hardware
  • numbers to binaryHi everyone, I have looked through the manual and have found nothing. How do you change a number to binary easily? I know you can go binary to decim…

    ... . If anyone knows how to fix it... :)

    [code]10 ... *(d>=2)))
    20 INPUT "Number? (0-255): ";n
    mcleod_ideafix mcleod_ideafix October 2010 Sinclair Basic
  • Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…

    ... +2 will "fry the ULA". The audio input is completely buffered and ... gate array with an audio input signal would be by feeding ...
    guesser guesser October 2010 Hardware
  • Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…

    ... is not a 'how to fix my broken Spectrum" plea but ... died, some people have said ULA, others RAM, me I haven ... have thought the +3 ULA was robust as it was ... that it could be my ULA from the above description? ... from a +3 when its ULA does die? (sensible answers only ...
    ASM ASM October 2010 Hardware
  • Do ULAs die?Thought I'd start this thread as people often think their ULA is dead, when it's actually the RAM or power circuits. Searching the forum in the futur…

    ... remember one "particular case" - working ULA 6c with dead pin no ... damaged peripheriall cell or input buffer in ULA, however this chip was ...
    riad riad October 2010 Hardware
  • emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…

    ... only 81 had pretty convincing ula interference but no dot ... crawl and ula snow - though these are ... br />

    7. ula+ is only for the harlequin ... or with the spectrum ula a whole third of ... vga back into the video input - composite or s-video ...
    Roger Jowett Roger Jowett October 2010 Emulators
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