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<1234567…34>
  • Fully refurbished ZX Spectrum 48K boards incl. ULA- Including ULA (version that [URL="http://www.bytedelight.com/?p=41"]corresponds to the board issue[/URL] - click to find out more about ULA version…

    - Including ULA (version that [URL="http://www. ... to find out more about ULA versions)
    - All new electrolytic capacitors ...
    bverstee bverstee February 2015 Sales
  • SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…

    ... issue 4B (rubber keys)
    [*]ULA inside is of type 6C001E ... case with other issue boards, ULA versions, or SRAM types. Right now ...
    RetroTechie RetroTechie February 2009 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... why Sinclair did all those ULA versions... Still waiting my membrane keyboard ...
    Gods Gods June 2007 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... why Sinclair did all those ULA versions... Still waiting my membrane keyboard ...
    DEATH DEATH June 2007 Hardware
  • ULA Book - Target Audience?This is probably of most intrerest to hardware chaps, but a greater community input would be good. I've been turning all my ULA analysis into a love…

    ... Spectrum and it's ULA. Part2: The ULA in depth. Part3: ... suggest maybe sticking with the ULA for the moment, but ... appendix would show where the ULA versions differ, and perhaps discussion of ... nice, showing how the ULA interacts with the other components ...
    csmith csmith May 2008 Sinclair Miscellaneous
  • Pera Putnik's RGB interfaceI am sure some (if not many) of you will have seen Pera Putnik's RGB interface [URL="http://members.tripod.com/%7Epiters/uvyrgb.htm"]circuit diagram…

    ... area because of differences in ULA versions without need of adjusting the ... there are no vertical stripes (ULA noise) without any special termination ... of the ULA signals. The test board (contains ...
    ingo ingo May 2009 Hardware
  • 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…

    ... small but significant differences between ULA versions (hardware bugfixes), but AFAIK ... a Spectrum by putting different ULA version in a board. Although ... prefer to keep same version ULA on a board that was ... still a socket for the ULA on the board itself, or ...
    RetroTechie RetroTechie December 2010 Hardware
  • 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…

    ... dedicated to the 128K ULA in the ULA Versions chapter, though it only ... these superficial mods, the 128K ULA is identical to the 48K ... with the ULA. I do mention this in the Versions chapter because ... the false impression that the ULA is involved.

    ...
    csmith csmith January 2011 Hardware
  • 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…

    ... dedicated to the 128K ULA in the ULA Versions chapter, though it only ... these superficial mods, the 128K ULA is identical to the 48K ... with the ULA. I do mention this in the Versions chapter because ... the false impression that the ULA is involved.
    [/QUOTE]< ...
    spodula spodula January 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…

    ... line internally by mistake, the ULA didn't apply enough contention ... that they could force the ULA to use the more ... maintain timing compatibility, the later ULA versions had to keep using the ... was made part of the ULA design itself. The above mentioned ...
    Patrik Rak Patrik Rak March 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"…

    ... this count for all IF1_Rom Versions??[/QUOTE]

    The hardware ... PCB's and/or IF1 ULA versions with different behaviours, I'd ... counts for all shadow ROM versions.
    mcleod_ideafix mcleod_ideafix June 2011 Emulators
  • 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…

    If the ULA has been replaced, the mod ... to do with the original ULA versions, but not the later. Autopilot ...
    csmith csmith October 2011 Hardware
  • Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…

    ... (s?) have this problem, later ULA versions don't (search RWAP's ... 's that have an older ULA installed... :-)
    RetroTechie RetroTechie October 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... for you to try different ULA versions (5C112 vs. 6C001) in that ... only tested with the later ULA's, not sure whether I ...
    RetroTechie RetroTechie December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... for you to try different ULA versions (5C112 vs. 6C001) in that ... only tested with the later ULA's, not sure whether I ... I've got a 6C001 ULA that isn't soldered into ...
    Zorn Zorn December 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... , have a look at the ULA versions chapter. The later motherboards delay ... you measuring /RAS? A the ULA or DRAM? If at the ... ULA, then no cleanup possible.
    < ...
    csmith csmith December 2011 Hardware
  • ULAs interchangeable across issuesHi all, Now that I'm retired, I'm looking again at 8 bit computing :) I'm attempting to revive a spectrum 48K. I'm going to swap chips in/out from…

    Chris Smith's book has a whole chapter on ULA versions.
    According to the book the transistor modification was still required on the issue 3 ULA and there were some resistor changes on the PCB for the new ULA.
    Basher Basher August 2013 Hardware
  • Two more faulty onesCould I get your opinion on these two faults, please? Understanding these two cases would be very beneficial for my ZX education. Thanks! - A Spectr…

    ... :

    [QUOTE]
    The ULA cleaned up the earlier I ... to the issue 2 5C112E ULA and altered the timing of ... ][SIZE=1]Chapter 24. ULA Versions, section "Issue 3 ULA 6C001E-6", p ...
    balford balford November 2013 Hardware
  • Heatsink's for ZX SpectrumAre heatsinks usefull for the chips are used in ZX Spectrum's On eBay I saw some heatsinks for ULA's, 3 for +/- 8 dollar's. And I want to know are th…

    Jimre of this parish performed some temperature measurements of various ULA versions a while back which may be of interest.

    [URL="http://www.worldofspectrum.org/forums/showthread.php?t=45721"]Link[/URL]

    B
    balford balford August 2014 Hardware
  • ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…

    ... interesting to see what the ULA versions are on the various boards ...
    rune rune August 2014 Sinclair Miscellaneous
  • ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…

    ... back porch).

    The ULA is 2C184E and all chips ... porch generation issues for all ULA versions. However the CCB doesn't ...
    balford balford August 2014 Sinclair Miscellaneous
  • Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…

    ... ), and the highest/lowest Z80 + ULA date codes.

    To ... /> I also tried grouping together ULA versions and date codes to get ... overlapped?):

    [code]
    ULA ULADate Total
    ---------- ------- -----------
    5C102E ...
    AdamS AdamS December 2014 Sinclair Miscellaneous
  • IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…

    ... designs.

    The Spectrum ULA is a good example of ... were later integrated into the ULA (ULA versions 3C112E and later) and the ... 3 onwards).

    The ULA port does have one extra ... them. When reading from the ULA, where the upper-most bits ...
    zub zub September 2015 Hardware
  • Faulty Issue 1Hi all, thought I'd document my efforts in getting another speccy working. I've never done this before so please bear with me... I recently took a p…

    ... / best way to tell ULA and Z80 accesses apart. Especially ... i] be documented, for different (!) ULA versions it's not afaik.
    a) ULA version please! ;)
    b) ... , Z80 memory writes, or ULA reads from the lower RAM.
    RetroTechie RetroTechie November 2015 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... input switching levels, as the ULA is a digital chip being ... .

    Especially as different ULA versions were used during the production ...
    1024MAK 1024MAK May 2019 Hardware
  • Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…

    ... margins?[/quote]
    The ULA technology was designed to be ... devices. However, with the ULA that Sinclair used, it is ... different batches or versions of ULA. A number of ULA versions exist.
    ... signal. “The ZX Spectrum ULA, How to Design a Microcomputer ...
    1024MAK 1024MAK October 2019 Development
  • 48k Spec with composite video mod, screen adjustment possible?I've had a 48k Speccy with a composite video mod for a few years now, and although it works perfectly otherwise, the screen isn't centered correctly …

    ... limitation[/s] feature of the ULA chips (type 6C001E-1) used ... all subsequent machines and subsequent ULA versions. Sinclair apparently made a slight ...
    1024MAK 1024MAK August 2020 Hardware
  • 48k Spec with composite video mod, screen adjustment possible?I've had a 48k Speccy with a composite video mod for a few years now, and although it works perfectly otherwise, the screen isn't centered correctly …

    ... limitation[/s] feature of the ULA chips (type 6C001E-1) used ... all subsequent machines and subsequent ULA versions. Sinclair apparently made a slight ...
    Skaepoy Skaepoy August 2020 Hardware
  • doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…

    ... in general put a later ULA version in an earlier board ... . But putting an earlier version ULA in a later board may ... design limitation present in all ULA versions. It is commonly on top ...
    1024MAK 1024MAK September 2020 Hardware
  • Whats the smallest amount of time to precise emulate a Spectrum?Whats the smallest amount of time to completely emulate a Spectrum? Maybe the ULAs timings as mentioned here: [url="https://opencores.org/projects…

    ... "standard" 48k/128k Spectrum (all ULA-versions) without loosing any detail (like ... both Z80 and ZX Spectrum ULA.[/quote]

    Or must ... like analog timings instead of "ULA/CPU digital timings"?
    Luzie Luzie June 2021 Emulators
<1234567…34>

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