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<1…13141516171819…34>
  • Surprise...Check out Google homepage.

    ... /> EDIT: just re-uploaded to remove the ULA ramping artefact.

    guesser guesser April 2012 Sinclair Miscellaneous
  • BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…

    ... ;623260]so who's arguing? ULA+ maybe a good solution, but ... 't remove contention. If you're going to replace the ULA, which ...
    chev chev April 2012 Announcements
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... a video signal then the ULA is at least mostly working ... supply lines (cut tracks or remove them from the board), repair ...
    Zorn Zorn May 2012 Hardware
  • Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…

    ... /> [quote]
    The ULA bug which causes snow when I is set ...
    zx81 zx81 June 2012 Emulators
  • Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…

    ... technical page: "The ULA bug which causes snow when I is set ... core tries to emulate the ULA in a precise way. So ...
    adorigatti adorigatti June 2012 Emulators
  • Robocop 3 and Spectrum 128K toast-rackHi all, we are going on with the tests on the new 128K emulator for the V6Z80p board, and we have found something odd: Robocop 3 (designed for the 12…

    ... technical page: "The ULA bug which causes snow when I is set ...
    Encarnado Encarnado June 2012 Emulators
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... one side of R27, and remove ULA from socket to isolate 1 ...
    RetroTechie RetroTechie June 2012 Hardware
  • ULA6C001E-7 and 48K Issue 2Dear Sirs, Could you please let me know if ULA6C001E-7 or ULA6C001E-6 chip was suitable for 48K board issue 2 ? I heard some mods are neccessary…

    ... if you had an older ULA, there is a "hardware patch ... fix a bug with that ula in place on the board ... . I used a later revision ULA for testing purposes on my ... , even though I did not remove the "patch".
    Johan1973 Johan1973 June 2012 Hardware
  • Internal amp and signal cleaner for tape inHello! Is there known to work INTERNAL schematic which cleans signal from tape in and amplifies it. I need such thing so i can load from my smartpho…

    ... exact properties of a typical ULA's tape I/O pin ... mess with component values, perhaps remove or add parts in a ... speaker is connected to the ULA tape I/O pin.
    RetroTechie RetroTechie July 2012 Hardware
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... into hardware), but seems that ula got confused only in T3 ... wrong.

    i.e. 'snow effect' is here, but it ... "right" — i've never seen snow on the bottom part of ... that somebody really notice incorrect snow emulation, but...

    p ...
    Ketmar Ketmar July 2012 Emulators
  • Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…

    ... that the Harlequin analysis on snow effect is not completed correct ... the ULA gets confused only with second screen byte, the snow should ... Harlequin website it seems the snow appears all over the screen ...
    Oibaf Oibaf August 2012 Emulators
  • +2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…

    ... the TEA2000. Next to the ULA, that seems to be the ... put it simply you just remove D31 and cut R46. Then ...
    guesser guesser September 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…

    ... (and of course ULA), so I can remove them to work with ...
    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
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... that ought not to. The ULA will warm up normally, and ... to all the pins, and remove the chip with a suitable ... confirm it's bad RAM, remove all the chips, put chip ...
    Winston Winston 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
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... higher priority is:
    1) remove any possibility of collision on ... state (if internal romcs from ula is in low state and ...
    velesoft velesoft December 2012 Hardware
  • Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…

    ... I/O bus cycle.
    // remove m1 from the equation if ... /> // confusion here.
    // If you remove m1 from this and all ... its outputs
    // with the ULA, as both give keyboard status ...
    mcleod_ideafix mcleod_ideafix January 2013 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 ... , but if you desolder and remove them all, put in IC ...
    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…

    ... and A15 inputs to the ULA on [B]issue 1 Spectrums ... . Well... the solution is obvious: remove the dead cockroach and restore ...
    mcleod_ideafix mcleod_ideafix 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 ... that it is trivial to remove the clash is a bonus ...
    guesser guesser March 2013 Hardware
  • Spectrum 128K +2 problemhello, i am try to repair my spectrum 128k +2 grey, i remove all ram chips and i have some new ones spares, now i have remove all ram chips, i want …

    ... strange...

    i complete remove the ROM chip and nothing ... the ROM and to the ULA via 470 ohm resistors. Each ... each data line from the ULA should go to one RAM ... the Z80 CPU and the ULA to operate separately). On the ...
    1024MAK 1024MAK March 2013 Hardware
  • RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…

    ... all ram ic's cpu ula rom and anything goes where ... about the +5 volts on ula 4 pin
    what he ... finally found a DMA0 line (ULA pin 4) stuck to +5V ... removed and socketed. You should remove all those chips, then check ...
    Falco-F8L Falco-F8L 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
<1…13141516171819…34>

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