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<1…17181920212223…34>
  • Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…

    ... way of determining if the ULA or the CPU is reading ... signals are provided via the ULA, its a pain), Alas, its ...
    spodula spodula January 2011 Hardware
  • How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…

    ... order ram (> 16K) the ULA (or PIC in my case ...
    Robin Robin January 2011 Hardware
  • Possible design fault in +2A/+3 power pack. Fix?It's the second time a +3 power pack ceases to work when I make a short while using the scope to diagnose a +2A/+3 computer. And it's the second tim…

    ... . So I peeked at the schematic for this power pack.
    mcleod_ideafix mcleod_ideafix February 2011 Hardware
  • Fully integrated ZX+Hi, I just want to show some inspiration for integration HW to ZX+ case ;-) - ZX48 issue 3 board, without all parts regarding video generating (pa…

    ... /> - scandoubler which catch data during ULA VRAM access
    - Divide with ...
    willcz willcz February 2011 Hardware
  • Smooth (vertical) scrolling on ZX SpectrumI was just thinking about this. You know, you have systems like Atari 2600 or Sega SG-1000 that have no hardware scroll, but they have games that sti…

    ... to do the tricks within ULA display time.

    I ...
    maiki maiki February 2011 Games
  • Is ZX80 really "Z80 only"?The Spectrum has ULA to generate video display. Does the ZX 80 have any kind of processing chips apart from Z80? How is the video display generated o…

    The Spectrum has ULA to generate video display. Does the ZX 80 have any kind of processing chips apart from Z80? How is the video display generated on ZX80? How does it compare to Atari 2600's CPU + TIA combo?
    maiki maiki March 2011 Sinclair Miscellaneous
  • ZX Spectrum Woes...In my endeavours to get my second Spectrum (Issue 3) working I have replaced the CPU, memory and lower ram. I have fitted sockets for the CPU and me…

    ... signal provided by the ULA is the 14MHz ULA clock signal divided ... shows pin 32 of the ULA as high and pin 6 ... wave. Pin 39 of the ULA is permanently high, although the ...
    weathereye weathereye March 2011 Hardware
  • Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …

    ... external ram pages are fast (ULA no slow down CPU and ...
    velesoft velesoft March 2011 Hardware
  • Faulty +2AHi! I have a +2A from a friend which is not working. I recently made a composite video output for it, using a small circuit from Sami Vehaama. When …

    ... ]

    I think the ULA is faulty... but it could ...
    Hernán Pablo Álvarez Hernán Pablo Álvarez March 2011 Hardware
  • Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…

    ... this has the dead cockroach ULA fix. I would have presumed ...
    flashbackgames flashbackgames March 2011 Hardware
  • S-Video kit for 128k modelsAs discussed in this thread: [URL]http://www.worldofspectrum.org/forums/showthread.php?t=33768[/URL] My arm has been twisted to do an s-video mod ki…

    ... I can't find a schematic anwyhere* but either way, it ...
    guesser guesser April 2011 Hardware
  • Does the usual composite mod damage Speccies?Hi people, Just browsing eBay -as you do - and I noticed this auction: [url]http://cgi.ebay.co.uk/ZX-SPECTRUM-48K-GOOD-COND-COMPOSITE-OUTPUT-SINCLAI…

    ... usual "whack the line from ULA straight to the modulator output ... popular, because by wiring the ULA straight to the output (and ... ) you can apparently damage the ULA.

    Is this actually ... damaging my oh so precious ULA by doing this?
    Spirantho Spirantho April 2011 Hardware
  • Brief report about RetroEncounterAnother April... another retro event! (Firstly sorry for the quality of the photos, owing to not being able to find my camera battery before leaving …

    ... of an external FPGA-based ULA+ implementation) it was finally time ...
    Winston Winston April 2011 Sinclair Miscellaneous
  • ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…

    ... up at all, including the ULA. Im wondering if this is ...
    vinnivee vinnivee April 2011 Hardware
  • ZX Microdrive errorToday I started some ZX Microdrive having in the closet, and only one has given me problems with the typical [B]Microdrive Not present[/B] error. As …

    ... there is no problem of ULA and the motor starts, I ...
    Mobutu Mobutu April 2011 Hardware
  • Amstrad Toast Rack?Hello there my fellow WoS'ers Recently I have been very lucky with my brother giving me a Sinclair Spectrum 128K+ (Toast Rack), it needed a little a…

    ... servicing, I noticed that the ULA is [B]Amstrad[/B]
    ULA, arguably suggesting a closer-tie ... are known to have Amstrad ULA's in some models.
    Zetr0 Zetr0 May 2011 Hardware
  • Grey+2 displays cyan instad og bright 0 whitehere's a weird one one of my grey+2's displays cyan instead of white, yet bright 1 white is ok I swapped a ULA out of a machine that is ok and it's…

    here's a weird one

    one of my grey+2's displays cyan instead of white, yet bright 1 white is ok

    I swapped a ULA out of a machine that is ok and it's the same

    this comes through both rf and scart, any ideas?
    BiNMaN BiNMaN May 2011 Hardware
  • Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…

    ... main ROM, not floating bus (ULA/FFh), of a mirror of ...
    mcleod_ideafix mcleod_ideafix June 2011 Emulators
  • Spectrum+ fault - lines on boot screen, freezesThe ZX Spectrum+ I bought in the car boot has a fault. When you boot it, it's displaying the Copyright screen, but each character position has a vert…

    ... I don't think the ULA had any reason to be ... it just be that the ULA isn't suitable for it ...
    Muzer Muzer June 2011 Hardware
  • ZX Spectrum 48K clone and test resultsHi! This is my first post, so, first of all, I'd like to say hello to the whole community! I am Alessandro Dorigatti from Italy and I'm developing …

    ... Chris Smith "The ZX Spectrum ULA: how to design a microcomputer ...
    adorigatti adorigatti July 2011 Hardware
  • Spectrum 128k+ Toastrack lower Beeper level?Does anyone know the easiest way of matching the AY and beeper levels? I'm guessing perhaps the easiest thing to do is lower the beeper line rather t…

    ... beeper comes out of the ULA and maybe drop the level ... the pin outs of the ULA for the 128k+ anywhere? No ... which pin out of the ULA the beeper comes from and ...
    RobeeeJay RobeeeJay August 2011 Hardware
  • ZXMMC+ emulation added to Z80p48K emulator for the V6Z80p+Hi friends! As time ago I've posted a thread about an FPGA clone for the V6Z80p board, I'd like to give an update about the status of the project. …

    ... described in "The ZX Spectrum ULA: how to design a ... 7MHz, 14MHz (experimental). The original ULA contention algorithm is always applied ... (PAL => PAL ULA, NTSC => NTSC ULA)
    - VGA 50Hz ... 50Hz => PAL ULA, VGA 60HZ => NTSC ULA)

    ...
    adorigatti adorigatti August 2011 Hardware
  • try to fix issue 4 board problemHi I try to fix speccy 48. All voltages are in place, ula 100% ok, cutted +5v from ic25 so far no luck. What next? ROM or upper memory? wojtek (i…

    ... . All voltages are in place, ula 100% ok, cutted +5v from ...
    cyborg50 cyborg50 August 2011 Hardware
  • RGB cableI constructed an RGB cable to my +3 as per schematic on page 14 of this document here: [URL="http://mts.speccy.cz/doc/128_rgb.pdf"]http://mts.speccy.…

    ... to my +3 as per schematic on page 14 of this ...
    protek protek August 2011 Hardware
  • Spectrum + and +3 Bath! Including SEXY photos!Continuing my "bath" projects: Today I repaired a 48K Spectrum + to working condition, an Issue 4 that is nice and stable. Took 4x Spectrums+ apart …

    ... ensure longer life of the ULA and Z80.

    [IMG ...
    Hedegaard Hedegaard September 2011 Sinclair Miscellaneous
  • Spectrum +128K Toaster Rack & a skanky Spectrum +2A Bath - Incl. naked pictures!Ok, so today was another productive day to complete 2x Spectrums with their baths and assembly. One fat and grey +2A and one sleek sexy 128K The grey…

    ... sink on her pus...uh....ULA!

    [IMG]http://i1193 ...
    Hedegaard Hedegaard September 2011 Sinclair Miscellaneous
  • Is this pure bulls@*t or what?Read [URL="http://www.ebay.co.uk/itm/SINCLAIR-ZX-SPECTRUM-PLUS-48K-REFURB-COMPOSITE-OUT-/170691876340?pt=UK_VintageComputing_RL&hash=item27be0755f4#h…

    ... the composite mod damaging the ULA, cant be true surely
    Macc Macc September 2011 Sinclair Miscellaneous
  • Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…

    ... hot (all 4) and also ULA. Regulator (7805CV) don't heat ...
    lillaolle64 lillaolle64 September 2011 Hardware
  • Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…

    ... to go from under the ULA to under the CPU.
    ULA pin 37 (A15)
    Pin ... fourth NAND gate) goes to ULA pin 36 (A14)
    Pin ... .e.+5V) will stop the ULA responding to I/O requests ...
    cmonkey cmonkey October 2011 Hardware
  • black +2 go awayHi, All what is my problem if i have the proper voltages inside my black Spectrum +2 black (+5v+12v) in all the important IC's , and not have any vi…

    ... if i put high level ULA go away, but i hope ...
    gorski gorski October 2011 Hardware
<1…17181920212223…34>

Latest Posts

  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21

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