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  • LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…

    ... have to wait for the ULA to release the wait state ... ]next[/I] gap in the ULA wait states before it can ...
    ajmoss ajmoss June 2010 Development
  • RGB to VGA convertor for ZX128/+2/+2A/+3David Luftner release source code (VHDL) of SCANDOUBLER for ZX128/ZX128+2/+2A/+3: [url]http://velesoft.speccy.cz/other/scandoubler-for-zx128_fixed_by…

    ... .4690 MHz from ZX board. ( ULA chip use 17.7345 MHz ...
    velesoft velesoft 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 …

    ... on z80 side facing the ula) just at the transistor plastic ... Service Manual that, related to ula 5c112 timing problems, speaks about ...
    Cignale Cignale July 2010 Hardware
  • Picture interference on red areas.I recently got a 48K Speccy off eBay, did a composite mode and it seemed to work OK, but then my TV had to go off for repair so I didn't use it for a…

    ... faults, e.g. an aging ULA or other components?
    joefish joefish July 2010 Hardware
  • ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…

    The book is complete and with the printer.
    Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all your pre-orders.

    It's been an effort like no other I've experienced!

    To keep ...
    csmith csmith July 2010 Sinclair Miscellaneous
  • 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…

    ... beeper sound right off the ULA or from the sound output ...
    bverstee bverstee August 2010 Hardware
  • Just for funJust for fun, imagine the Spectrum had a graphics mode where there were two attribute bytes per 8x8 block and each block had 2 bits per pixel choosin…

    ... pixel choosing from the 4 palette colours in the 8x8 block ...
    takapa takapa August 2010 Development
  • Things I'd ask Chris Smith if he would give an interview about his book and researchGiven your current knowledge about the ULA interns, knowing what technology was capable to do those days, and knowing what people then and now would …

    ... your current knowledge about the ULA interns, knowing what technology was ... been possible using the same ULA model? In other words, would ... sprites, fit into a 6C001E ULA device? Did Altwasser push the ... ULA to its limits? Have you ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • SpecOS progressOk, As you can all see, I'm back - and I've been working away on SpecOS for a while now. There's a few videos, which you can see on my blog: [url]h…

    ... any colours in the current palette, or they can be mono ...
    Dunny Dunny August 2010 Sinclair Miscellaneous
  • 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…

    ... that everything is OK. Also ULA is OK (i tested it ...
    lillaolle64 lillaolle64 August 2010 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... with these machines is the ULA chip, the only custom chip ... my head, with a working ULA (subsequently tested on another speccy ...
    Womble Womble 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…

    ... to custom chips like the ULA when they get old? Will ...
    Scottie_uk Scottie_uk 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…

    Reading the ULA book has reminded me of ... the CPU to fix a ULA bug (p71). The following diagram ... hardware patch that disables the ULA when A7=0?
    Ta ...
    Jonathan Harston Jonathan Harston September 2010 Hardware
  • +3 issues....Hello All I came by a couple of +3's on ebay and I'm having issues with them. Since I only ever owned a rubber key, thought someone might be able to…

    ... of screen roll. This the ULA chip gone bad?

    pigdog pigdog 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…

    ... OK (perfect 5V).
    The ULA gets a bit hot. Other ...
    Oldskool Oldskool September 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 now dot crawl ... and ula snow - though these are not ... reader please help
    the ula+ is only for the harlequin ... time or with the spectrum ula a whole third of the ...
    Roger Jowett Roger Jowett September 2010 Emulators
  • Memory upgradeHi! I bought a 16K rubber key Spectrum. It's said in the box and memory test program also said it's 16K machine. Strange thing is that there is yell…

    ... also 4 empty sockets between ULA and Z80.
    My question ...
    lillaolle64 lillaolle64 October 2010 Hardware
  • How looks a Spectrum shown in a TFT VGA monitor?Some people has just asked me if a cheap Dealextreme VGA Box is capable of showing a decent picture from a ZX Spectrum. Well, I've just modded one r…

    ... plain, without artifacts, other than ULA and composite video artifacts.
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • SpecEmu 2.9I've been taking the latest versions of SpecEmu from the ULA Plus web site as and when they've been appearing, but the latest one (build 15/08/10) se…

    ... versions of SpecEmu from the ULA Plus web site as and ...
    Lee Tonks Lee Tonks October 2010 Emulators
  • 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…

    ... as people often think their ULA is dead, when it's ... I've never known a ULA to die.[/i]

    ULA on a breadboard with the ...
    csmith csmith October 2010 Hardware
  • Steel Eagle: Martin Severn?Looks like Steel Eagle's loading screen has been done by Martin Severn. See that hidden signature in bottom right? This can be MAS, and I'm sure it'…

    ... .pri.ee/zxscreen/border/0/palette/pulsar/mode/mix/type/hidden ...
    moroz1999 moroz1999 October 2010 Infoseek database
  • VIC 20 on the SpectrumThe original "20 Commodes" program released for CSSCGC 2008 has been improved and now has its own entry in WoS. The improved code has been sitting on…

    ... more boxes :

    1) ULA-II support to show those ...
    Jimmy Jimmy October 2010 Announcements
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    ... is right next to the ULA the screen was coming back ...
    gtsamour gtsamour December 2010 Hardware
  • Interesting AuctionCheck out the speccy with a 'bank' of LEDs and the Atic Atac Poster. [url]http://cgi.ebay.com/SInclair-ZX-Spectrum-lot-parts-books-ula-feet-etc-/270…

    Check out the speccy with a 'bank' of LEDs and the Atic Atac Poster.

    [url]http://cgi.ebay.com/SInclair-ZX-Spectrum-lot-parts-books-ula-feet-etc-/270675478234?pt=UK_VintageComputing_RL&hash=item3f058406da[/url]
    beanz beanz December 2010 Sales
  • FS: My 48kIve decided to sell my personal, everyday 48k rubber key, reason being ive recently took delivery of another but this has nearly everything on the bo…

    ... ), new membrane and now working ULA in it (as supplied and ...
    Macc Macc December 2010 Sales
  • Ula 6c00ieHi is anyone will to part with 1 or 2 of these for ?10 ea? Ping me I you can help

    Hi is anyone will to part with 1 or 2 of these for ?10 ea?

    Ping me I you can help
    hedge hedge December 2010 Wanted
  • broken 48K, strange screenwell I finally socketed all lower 16K ram chips, (8 of them in a row near corner, not those 4 in two rows) and replaced them with new ones but it did…

    ... is turned on.
    strangely, ULA chip on this 48K is ...
    orange orange December 2010 Hardware
  • Error in the Schematics.Hi, i have been looking at a Speccy 48 PCB, and have figured out that all the Speccy schematics in the archive up to and including Rev 4a, contain an…

    ... to pin 37 on the ULA, not pin 27 as shown ...
    spodula spodula January 2011 Hardware
  • ZX Spectrum 48K,issue two - can't get it repairedI have an issue 2, which has some weird very small PCB hanging over the Z80. Some wire go to various places on the big PCB, two go to connections 36 …

    ... 36 and 37 of the ULA.

    Replaced TR4 and ... say:
    Z80 = working
    ULA = working (type is 5C102E)
    georgedb georgedb January 2011 Hardware
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Latest Posts

  • I bought an accoustic guitar. How do you play it?
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  • Goodbye Z80
    zx1 on 7:11PM
  • Happy 40th Birthday to the Amstrad CPC464!
    AndyC on 6:29PM
  • Another Birthday! The Game Boy Is 35!
    dm_boozefreek on 6:17PM
  • I am currently watching.....
    Antiriad2097 on 5:05PM
  • 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
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21

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