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<1…17181920212223…34>
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    [QUOTE=kpuchatek;603333]You may want to keep ULA chip. Most valuable part of ZX.
    It seems your faulty board does not have z80 fix ??? Issue 2 is a bit mystery to me, however.[/QUOTE]

    My faulty board has a NEC D780C-1, I believe.
    kamilb1998 kamilb1998 February 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... board does not have z80 fix ??? Issue 2 is a bit ... ]

    What is Z80 fix? Do you mean the transistor ... a design oversight in the ULA? It's present in the ...
    Zorn Zorn February 2012 Hardware
  • Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…

    ... =Zorn;603338]What is Z80 fix? Do you mean the transistor ... a design oversight in the ULA? It's present in the ...
    kamilb1998 kamilb1998 February 2012 Hardware
  • RFC: Hardware Documentation ProjectI've noticed quite a few threads recently about missing schematics and suchlike. I've also been thinking about the low quality of some of the schemat…

    ... .zxprojects.com/index.php/the-fix-a-spectrum-blog/21-noiseandaddresslinemess ... -flashing-blocks-but-not-because-ula-cpu-or-low-memory[/url ... zxprojects.com/index.php/the-fix-a-spectrum-blog/19-stressing ... +2 (grey) to workaround an ULA fault:
    [url]http://www ...
    mcleod_ideafix mcleod_ideafix March 2012 Sinclair Miscellaneous
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... is a sure way to fix this, by making your design ... to pin 1 of the ULA instead of the crystal. Use ...
    csmith csmith March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... is a sure way to fix this, by making your design ... do that for a 6C ULA.

    I'm still ...
    Zorn Zorn March 2012 Hardware
  • pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…

    ... the matrix array (+2A's ULA) logic so it's not ... more easy than the 'resistor fix'.
    bverstee bverstee April 2012 Hardware
  • pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…

    ... the matrix array (+2A's ULA) logic so it's not ... more easy than the 'resistor fix'.[/QUOTE]

    But the ... time. If you disable the ULA when a read is made ... end up with a deaf ULA :D
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... CPU data bus when the "ULA" is accessing memory, asserts more ... /> So it's necessary to fix the PCB so that the ... .

    To do the fix, take these steps:

    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... later had resistors for isolating ULA accesses from CPU accesses, but ... hooking the IO into the "ULA" side of the resistor buffer ... />
    Thanks for proving the fix :-)
    csmith csmith April 2012 Hardware
  • 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…

    ... taking the Harlequin, and ULA details from the book ... go at reproducing basic ula cells with transistors, so ... 2. Easy and cheap to fix a broken machine. You ... IC is unavailable (like the ULA).
    3. The ... connected). The Series 6 ULA more affordable but has ...
    antoniovillena antoniovillena April 2012 Hardware
  • "More tea Vicar?" on gray +2 with divIDEDid anybody try to run "More tea Vicar?" (128k version) on gray +2 with divIDE? On my machine game loads but crashes after joystick selection.

    ... .[/QUOTE]

    All the ULA 128s shipped broken. Why wouldn ... 't you want to fix it? This fix should also stop the ...
    chev chev April 2012 Games
  • Divide CF cardsI have recently got a Divide but I'am waiting for my Compact Flash card to come form Amazon. However, the Divide states that the CF card needs to be …

    ... peripherals (using remaining ports like ULA+ and Spectranet have)?[/QUOTE]
    fix used to stop it clashing ...
    chev chev May 2012 Hardware
  • My divide killed my toastracknow it boots with garbage and z80 overheats a lot will replacing z80 solve it , or something else can be bad?

    ... =aowen;626602]That means the ULA is ok. It will read ... sure a new z80 will fix my problem.
    already ordered ...
    danilop2k2 danilop2k2 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
  • 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…

    ... an older ULA, there is a "hardware patch" to fix a bug ... with that ula in place on ... . I used a later revision ULA for testing purposes on my ...
    Johan1973 Johan1973 June 2012 Hardware
  • Oooyaah! This came from nowhere......There's a new console in the works, and it's already massively popular, despite not existing... [url]http://www.kickstarter.com/projects/ouya/ouya-a…

    ... a cheap job-lot of ULA chips for his new Spectrum ... the seventy megabyte patch to fix the bugs and add eight ...
    ewgf ewgf July 2012 Chit chat
  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... made a quick and dirty fix for Sidewize by turning a ... timings of the +2A/+3 ULA, graphics flicker noticeably when your ...
    Alessandro Grussu Alessandro Grussu July 2012 Games
  • ZX81 with black screen and some white dots.Was gearing up to do a composite video mod on my ZX81, and today was going to be it. Unfortunate when started my ZX81 seems faulty. I get a back scre…

    ... 48k board I want to fix, and could very well squeeze ... doesn't need any LM1881 fix to properly output composite video ... needed for the ZX81 (buggy ULA version)

    [QUOTE=pmsr ...
    mcleod_ideafix mcleod_ideafix July 2012 Hardware
  • ZX81 with black screen and some white dots.Was gearing up to do a composite video mod on my ZX81, and today was going to be it. Unfortunate when started my ZX81 seems faulty. I get a back scre…

    ... doesn't need any LM1881 fix to properly output composite video ... needed for the ZX81 (buggy ULA version)


    BTW ... . My ZX81 has the buggy ULA, and it's the one ...
    pmsr pmsr July 2012 Hardware
  • ZX-Paintbrush 2.2.1 releasedDear readers and friends of ZX-Spectrum emulator stuff! Today I released the version 2.2.1 of ZX-Paintbrush with interesting new features and many b…

    ... easy when I implemented the ULA+ support. The bigger the program ... possible. Would be nice to fix all bugs before the 2 ...
    clausjahn clausjahn 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…

    ... 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
  • 80x24 mode (Timex required)Hopefully Martijn will be adding this to the archive soon, but until then grab it here: [url]https://dl.dropbox.com/u/15659782/BASIC80.zip[/url] Th…

    ... Pandora.[/QUOTE]
    Would Ferranti ULA be able to provide a ... even they did a new "ULA" for +3.


    fix the INPUT bug now. :)[/QUOTE ...
    Encarnado Encarnado August 2012 Sinclair Basic
  • 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
  • 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
<1…17181920212223…34>

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HitBox

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ula 7.3K 13K
snow 1.9K 2.6K
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