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  • DivIDE CompatabilityThe Spectrum is 30 show proved a valuable event for investigating issues with Spectrums which do not work with the DivIDE.... The ones I sell are ma…

    ... for repair displayed some possible ULA problems as without the DivIDE ...
    rwap rwap September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... 3.5MHz clock as the ULA generates it internally, and the ... in perfect sync with the ULA only about halfway across putting ...
    Winston Winston September 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... board, and an Issue 7 ULA.

    Spectrum number two ... 3 with an Issue 6 ULA. It is number two I ... service manual suggests replacing the ULA, but that hasn't made ...
    ramsrc ramsrc October 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... the verified all connections to ula and cpu via diodes d1 ... might be defective ?? ( i assume ula but how to prove that ... ?? )

    Ula is ofcourse the "6C001E-6 ... or maybe has a working ula for sale ??


    techy techy October 2012 Hardware
  • WTB: Interface 1 ULAsHi everybody, I suspect it's unlikely, but does anybody have any spare Interface 1 ULA's lying around? Would be happy to send a bit of cash in excha…

    Hi everybody,

    I suspect it's unlikely, but does anybody have any spare Interface 1 ULA's lying around? Would be happy to send a bit of cash in exchange for any - I have about 4 ULA-less IF1s here. :)

    Thanks!
    Spirantho Spirantho October 2012 Wanted
  • Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…

    ... next modes is automatically activated ULA raining protection.

    - is ... full speed without slow down. ULA can slow down only CPU ... ZX is used only for ula video data.

    - new ...
    velesoft velesoft October 2012 Sales
  • ZX-Preview 2.1 publishedDear friends and ZX-Speccy fans! Today I've released a new version of ZX-Preview. I completed the to-do-list for the program and added the following…

    ... /> * ability to display tiles and ULA+ screen$

    Hope you ...
    clausjahn clausjahn October 2012 Emulators
  • The great 128k ConversionWell, I am not sure if it is going to be great. Hopefully it will! This evening, I set about getting my Issue 6A Spectrum Plus working. I suspecte…

    ... from the factory with the ULA socket in upside down.
    ramsrc ramsrc October 2012 Hardware
  • A console type emulator for windows?Does anybody know of an emulator for windows that can be opened instantly into a snapshot menu screen and can be controlled by a usb joystick. Like …

    ... at startup. I want to bypass seeing windows or using a ...
    rustyredline rustyredline November 2012 Emulators
  • Cycle exact emulation?I was just reading the thread about +3 emulation having different results on different emulators, and it made me wonder if any Spectrum emulators hav…

    ... actions of some instructions, exact ULA behavior prediction, and the way ...
    ewgf ewgf November 2012 Emulators
  • Strange failure modeI just had a 48K machine "fail" in what seemed like an odd way. Problem: Random keypresses (not from any particular part of the key matrix) appearin…

    ... all the inputs to the ULA to make sure the pull ... a possible problem with the ULA.

    But when I ...
    Winston Winston November 2012 Hardware
  • Brief report on Retroma?Well, that's the last retro event of 2012 for me at least - five days of Retroma??a have just come to a close. This event is held as part of the Wee…

    ... such as Chris Smith's ULA book.

    [img]http ...
    Winston Winston November 2012 Sinclair Miscellaneous
  • Spectrum 128K & Philips CM8833Hello to everybody, My Philips CM8833 is one of my favourite monitors of all time, as it accepts connections from anything I can think of with the e…

    ... amplitude, but the Vsync (meaning ULA Pin 23) is only 2 ...
    Falco-F8L Falco-F8L November 2012 Hardware
  • Microdrive without interface 1 on a Spectrum +2The [B]divide [/B]is not compatible with the interface 1. however, I would like to use the microdrive on a Spectrum +2. it would be possible to recre…

    ... in the interface 1 without ULA?
    or someone has an ...
    DerSchatten DerSchatten November 2012 Hardware
  • Standard for upgrading the original ZX Spectrum[B][U]1. Easily connect external ULA and video RAM.[/U][/B] [url]http://zx.clan.su/forum/8-102-576-16-1352476666[/url] The method consists in blocki…

    ... ][U]1. Easily connect external ULA and video RAM.[/U][/B ... the CPU clock of the ULA, and connect the external clock ... lock the clock on the ULA, set the zero level at ...
    Black_Cat Black_Cat November 2012 Hardware
  • How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…

    ... description of the ZX Spectrum ULA
    2. the clones without ... the ULA but with only logic chips ...
    3. the ULA plus/SPECTRA solutions inside an ...
    bverstee bverstee December 2012 Hardware
  • Memotech MTX 512 Speculator addonWhen Googling a bit I stumbled across this website: [url]http://primrosebank.net/computers/mtx/mtxphoto.htm[/url] The Memotech MTX 512 offers an opt…

    ... .
    Only there is no ULA: it's functions are embedded ...
    bverstee bverstee December 2012 Hardware
  • Configuration of FPGA coresHi all! Lately a lot of features have been added to the V6Z80p Spectrum core. Most of them are handled (clearly) using ports. Some examples: ULA+, Ti…

    ... ) using ports.
    Some examples: ULA+, Timex modes, Kempston Joystick, etc ...
    adorigatti adorigatti 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…

    ... (from pin 23 of the "ULA").
    TR7 is the transistor ... that pulls the ULA's /IOREQ line high when ... only slightly quieter than the ULA/cassette generated sounds.

    ULA pin. Try not to change ...
    1024MAK 1024MAK January 2013 Hardware
  • Zero 0.5 ReleasedAfter a bit of a hiatus, the next update of Zero is now available [URL="www.ramtop.wordpress.com"]here[/URL]. Feedback and bug-reports appreciated! …

    ... in full screen.
    + Added ULA Plus and +3 disk support ... IN contention (Woody).
    - Fixed ULA PLus emulation that was broken ... over it. (Obo)
    - Fixed ULA Plus timing and colours (Andrew ...
    Arjun Arjun January 2013 Emulators
  • Issue 6A trouble[url=http://postimage.org/image/xp4rtmfp1/][img]http://s18.postimage.org/xp4rtmfp1/P040213_13_34_01.jpg[/img][/url] Only socketed chip is ULA which …

    ... />
    Only socketed chip is ULA which ive swapped out just ...
    Macc Macc February 2013 Hardware
  • Designing a Modern 'Professional' low cost ZX Spectrum ??Hi, I'm looking at designing a low cost hight performance (20MHz) ZX Spectrum... in the mould of the original, but using modern-day components. The…

    ... or two as glue logic+ULA etc)
    V9958 Video IC ...
    lezanderson lezanderson February 2013 Sinclair Miscellaneous
  • +2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…

    ... two ways...

    1: Bypass the regulator (pins 1 and ...
    napoleonblownaparte napoleonblownaparte February 2013 Hardware
  • Cheap electronic kits for hobbyists/Students etcAs prices start to get silly on ebay for electronic components like CPUs, Memory etc, I've sourced two suppliers from China that do me great deals. …

    ... Z80+SRAM+EPROM etc and bypass ebay. They can get lots ...
    lezanderson lezanderson February 2013 Hardware
  • +2 fried using the datacorder(Hi, first post here.) I just got hold of an extremely battered and bruised +2 sold to me for spare parts. As usual I plug it in, hook it up to the …

    ... thinking it's either the ULA or some RAM that's ...
    actel actel February 2013 Hardware
  • Spectranet firmware update: TAP file loading fixArchie Robins discovered a problem whereby interrups were being erroneously enabled on the return from a tape trap (that is, when TAP files are being…

    ... will be overwritten if a ULA interrupt occurs. This is usually ...
    Winston Winston March 2013 Hardware
  • March offers: lot's of parts!!!I have PLENTY parts available like a lot of 4164 ram chips. I even got some rare spare parts like ZX Spectrum issue two ULA's. - Logic chips: 74LSXX…

    ... like ZX Spectrum issue two ULA's.

    - Logic chips ... each[/B]

    - 48K ULA
    [B]10 GBP each ...
    bverstee bverstee March 2013 Sales
  • ZX-Paintbrush 2.3 publishedDear readers, Today, I published version 2.3 of ZX-Paintbrush. Inspirated by kgmcneil, I decided to follow his ideas and implemented a switchable p…

    ... , inside the palette editor (the ULA+ palette editor is not mentioned ...
    clausjahn clausjahn March 2013 Emulators
  • Dataline check on Spectrum 128k +2 greyhi all according with this [url]http://tcg.speccy.cz/zoom/pics/plus2sch.png[/url] R22 pin goes to A14 wich is pin 43 of ULA and pin 4 of Z80 bu…

    ... wich is pin 43 of ULA and pin 4 of Z80 ... and not pin 43 of ULA

    some broken here ...
    xaris_sm xaris_sm March 2013 Hardware
  • Improving Composite Output of 48K SpectrumI've been playing around with this Spectrum 48k I got inside a dK'tronics keyboard, because well I've already got two working other ones so why not..…

    ... at the output of the ULA luminance pin, the noise is ...
    RobeeeJay RobeeeJay March 2013 Hardware
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