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  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... missed opportunity of implemention of ULA Plus, I think all people ... signal. I know, anybody can fix this missing signal, but most ...
    Speccyman Speccyman August 2012 Sinclair Miscellaneous
  • Need repair advice - noviceHello, does anyone know where I can get a professional to rejuvenate my 128 heatsink model? I know nothing of electronics and can't solder for toffee…

    ... much quieter than the ULA beep. You can fix the problem with ... these:

    - Replace the ULA sound resistor with one of ... volume, but will make the ULA quieter* at your will, you ... will still be quieter than ULA, but much better. You may ...
    pkersey pkersey August 2012 Hardware
  • 128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…

    ... input connector that goes to ULA.[/QUOTE]
    Hi Johan,
    pnp type. In that case the ...
    ingo ingo August 2012 Hardware
  • Spectrum +2 EPROM in Spectrum +2AHi, My friend Marc bought a +2A from Tim Abbott at the Spectrum 30 event. Back in the day there were companies selling +2 ROMs to put into +2As to r…

    ... order to fix a +3 with a short into the ULA, which ...
    mcleod_ideafix mcleod_ideafix September 2012 Hardware
  • Z80 new old stockHi. I found this on eBay but ... is there a way we could know they don't hav a faulty M1 line? [url]http://www.ebay.com/itm/Zilog-Z80-CPU-Z0840004PS…

    ... the method of dividing the ULA half and CPU half of ... it can mean you get "snow" effect on the screen all ... the lower RAM while the ULA is reading video memory, so ... the ULA sees what the CPU is ...
    Winston Winston October 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... design having already filled the ULA, the full use of ... to meet to get the ULA produced ready for market ( ... the ULA A14 and A15 inputs was needed (to fix a ... of the Z80 CPU to fix "another" ULA problem (or is it ... another way to fix the same ...
    1024MAK 1024MAK October 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... [/b] list right now:
    - Fix a contention problem with DivIDE ... just fine, sometimes not.
    - Fix an update palette issue. Sometimes ... other signal that prevents the ULA for detecting an I/O ... address multiplexer to let the ULA get all the bits of ...
    mcleod_ideafix mcleod_ideafix November 2012 Hardware
  • 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…

    ... likely, is a faulty ULA (if the ULA is toast, this writes ... lot of satisfaction when you fix something like this after a ...
    Drbabbers Drbabbers November 2012 Hardware
  • 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…

    ... lot of satisfaction when you fix something like this after a ... worth spending some time to fix it. The power supply and ... the signals at various points (ULA pins, series resistors, DIN connector ... as it would mean the ULA is toasted).

    Only ...
    Falco-F8L Falco-F8L November 2012 Hardware
  • No tea vicar on MB02Hello Folks, I have difficulties in getting "More tea vicar" (the free 128k version) running on the MB02. The game starts and you can choose control…

    ... anyway an ULA corrector in my Spectrum+2, so no snow at ...
    Speccyman Speccyman December 2012 Sinclair Miscellaneous
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... , and sometimes, low pulses from ULA make its way through the ... /> If problems remain after that fix, it must be the M1 ...
    bverstee bverstee December 2012 Hardware
  • CAPS SHIFT on Spectrum+ ComputerI have just recently supplied a couple of replacement Spectrum+ keyboard membranes to a customer in Barby, Germany. Although something may have been…

    ... 's too much effort to fix...[/QUOTE]
    Yes if you ... keyboard input lines of the ULA.
    The adress lines used ...
    ingo ingo December 2012 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 …

    ... longer working. The CPU and ULA are pretty much certainly working ... dead. You'll need to fix the internal power supply before ...
    Winston Winston January 2013 Hardware
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... CPU for eliminate ula effect known as "screen raining / snow effect"
    ula slow-down cpu with same ...
    velesoft velesoft January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... (incompatible with Sinclair's ULA). This ULA has been cloned with CPLD ... mode, or even the different ULA, though?) with correct timings (either ... ').
    [*] Details on how the 'snow' caused by incorrect setting of ...
    zub zub January 2013 Hardware
  • Which type of Z80 cpu to use with ZX 48?Which type of Z80 cpu can I use with ZX 48? Only the 4 MHz cpu's or some with more MHz? Did not know if a 6 MHz cpu runs in a ZX 48 with 4 MHz. Mic…

    ... can get a bit of "snow effect" if you're using ... memory being seen by the ULA when it's reading video ...
    Winston Winston February 2013 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... /> The dead cockroach exists to fix a ULA bug, which is not ... present in the ULA+, so no problem with A14 ... altering the timing in the ULA+ to reduce IO contention, it ... is important that the ULA reads video bytes at the ...
    csmith csmith March 2013 Hardware
  • Fully-addressed devices initiative (FADI)I would like to introduce an initiative for those who create new pieces of hardware containing legacy devices with well-known addresses. It says that…

    ... , that when you use the ULA+ or ZXI, it is necessary ... aren't, a plug-in fix can be used with zero ...
    guesser guesser March 2013 Hardware
  • Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]

    ... /> Yes. But GAL chip can fix more bugs. Reading from port ... /REFRESH from CPU. Without raining/snow effect work software correct, but ...
    velesoft velesoft March 2013 Hardware
  • New Game: Toofy's Winter NutsBrrrrr it&#8217;s getting cold and winter is racing towards us. Toofy needs to collect enough nuts to make it through but the nasty squirrels have r…

    The game doesn't use ULA plus! Maybe a fuzzy picture ... getting stuck and release a fix.

    Got two other ...
    Paul-J Paul-J March 2013 Brand new software
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... a Spectrum with a standard ULA, with RGB output. If you ... /> The missing bit is to fix the deafness of this replacement ... SPECTRA could work with this ULA, and at the modulator input ...
    mcleod_ideafix mcleod_ideafix March 2013 Hardware
  • The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…

    ... you may get occasional unwanted "snow effect". The output impedance of ... separation resistors enough that the ULA sees some of the Z80 ...
    Winston Winston April 2013 Hardware
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... yet included in FBZX. Also snow effect has been improved:
    snow effect since the ULA bug was fixed in ... />
    Fuse does not emulate snow effect.

    Few emulators ...
    Oibaf Oibaf April 2013 Games
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... yet included in FBZX. Also snow effect has been improved:
    snow effect since the ULA bug was fixed in ... />
    Fuse does not emulate snow effect.

    Few emulators ... true, I remembered that the SNOW effect was for the +2 ...
    Ivanzx Ivanzx April 2013 Games
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... .

    The Snow effect occours when the ULA thinks that the ...
    Oibaf Oibaf April 2013 Games
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... />
    [quote]The ULA bug which causes snow when I is set ... and this interacts with the ULA accesing to a contended bank ...
    zx81 zx81 April 2013 Games
  • Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…

    ... when i was trying to fix my +2 grey in order ... IC's (cpu/rom/pcf/ula)

    another check was ...
    xaris_sm xaris_sm April 2013 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... check the RAM ic's ULA, CPU and ROM?[/QUOTE]
    snow with the Spectrum switched off ... tested the RAM IC's, ULA, CPU and ROM by plugging ...
    Pierre Pierre April 2013 Hardware
  • Keyboard Membrane Speccy +Grrrr! I'm having real problems getting the keyboard on my resurrected Spectrum+ to work reliably. I changed the keyboard membrane, and all seems to…

    ... the motherboard, or a dodgy ULA

    I had a ... we never did manage to fix from memory - it worked fine ...
    rwap rwap April 2013 Hardware
  • Most Excellent Song LyricsSome of the finest writing I've heard has to be from [I]Carter USM[/I]. For example, in [I]Suppose You Gave A Funeral And Nobody Came[/I] (a critiqu…

    ... some of your force to fix your f*ck*ng respirator ... like a pharaoh in the snow;
    Stop with the unpaid ...
    joefish joefish April 2013 Chit chat
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