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Search Again :: Adv Search 1000 results in 0.011s
<1234567…34>
  • NTSC for Speccy? What would happen?Hi doods. I was just reading a bit there about the TEA2000 video encoder. I'm just talking theory here. What would happen if you... Cut pins 12 an…

    ... (if such thing like NTSC 128 ULA exists at all)

    2 changes in ULA: 30 pics instead 25 pics ... per sec.
    For 48K ULA it would need different V ...
    piters piters July 2006 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... [QUOTE=Msx2;199951]Unfortunately spectrum 128+ does not have a blipper ... kind of malfunction being present (ULA, modulator).
    Also, ...
    Ι've never seen any 128+ ula's being sold separately on ... is not a Spectrum 128+ compatible ULA, this is for Russian ...
    gtsamour gtsamour July 2007 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... /> Ι've never seen any 128+ ula's being sold separately on ... a solution since the ula on that one could ... is not a Spectrum 128+ compatible ULA, this is for Russian ... do need a new ULA, I have a few ... compatible with the 7K010E5 ULA in the Speccy 128.

    ...
    Phu Phu July 2007 Hardware
  • The definitive Spectrum project??We know that the Spectrum has been put almost to its limits after all these years of life, but I would like to know which would be the definitive pro…

    ... need to reverse engineer the 128 ULA).[/QUOTE]

    Oh I ...
    NickH NickH September 2008 Games
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... . You'd need the 128K ULA for the memory paging, amongst ... /> You could replace the 48 ula with an upgrade with more ... /> Other than that, doable. :-) the 128 ula specifics are not difficult to ...
    csmith csmith November 2009 Emulators
  • z88dk SP1 - any internal oddities?I'm just wondering if anyone knows if the Z88DK's spritelib SP1 has any oddities inside, for instance relying on specific timings, undocumented instr…

    ... 's a bug in the 128 ULA that can cause random crashes ... due to interaction between the ULA and the Z80 refresh mechanism ...
    AndyC AndyC July 2012 Development
  • z88dk SP1 - any internal oddities?I'm just wondering if anyone knows if the Z88DK's spritelib SP1 has any oddities inside, for instance relying on specific timings, undocumented instr…

    ... 's a bug in the 128 ULA that can cause random crashes ... due to interaction between the ULA and the Z80 refresh mechanism ...
    Alcoholics Anonymous Alcoholics Anonymous July 2012 Development
  • z88dk SP1 - any internal oddities?I'm just wondering if anyone knows if the Z88DK's spritelib SP1 has any oddities inside, for instance relying on specific timings, undocumented instr…

    [QUOTE=AndyC;640826]There's a bug in the 128 ULA[/quote]

    Let me stop you right there. The ULA is fine. The bug is in the HAL chip and it can be fixed by ordering a replacement GAL from Velesoft.
    chev chev July 2012 Development
  • Timex 2068 hi-color / hi-res modes.Hello. I know this is not a Timex forum but since it is a very close relative of the Speccy I thought I'd ask my question here. Does anyone know …

    ... wasn't the 2068 ULA very compatible with the ... differences because the original ULA uses a single clock ... they fixed it in the 128 ULA). So Timex used a clock ... 2068's equivalent of the ULA) with the same timings ... for the standard Speccy ULA.[quote]I thought the ...
    chev chev November 2013 Sinclair Miscellaneous
  • New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …

    ... :

    [B][U]Toastrack 128 (ULA: 7K010E-5 8612, CPU: Zilog ... /> [U][B]Spectrum +2 Grey (ULA: Amstrad 40056 8630, CPU: NEC ...
    balford balford March 2014 Emulators
  • New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …

    ... :

    [B][U]Toastrack 128 (ULA: 7K010E-5 8612, CPU: Zilog ... /> [B][U]Spectrum +2 Grey (ULA: Amstrad 40056 8630, CPU: NEC ... 48K machine with 6C001E-7 ULA all consistently returned 69888/YES ...
    balford balford March 2014 Emulators
  • Dot crawl?Hi, As I'm rather new to the hardware of the spectrum, just to confirm: is this video showing "Dot crawl" ? [url]https://www.youtube.com/watch?v=_U…

    ... Spectrum by slightly increasing the ULA clock frequency which is divided ... of 7000039.471365639 Hz. The ULA now produces slightly shorter lines ... sequence.

    The Spectrum 128 ULA has 456 dots per line ...
    rga24 rga24 May 2014 Hardware
  • Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…

    If the ULA does turn out to be the problem, then you could try heatsinking the original 128 ULA, before looking for a replacement?

    B
    balford balford May 2014 Hardware
  • Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…

    [QUOTE=balford;771557]If the ULA does turn out to be ... could try heatsinking the original 128 ULA, before looking for a replacement ...
    Neosodium Neosodium June 2014 Hardware
  • Crowdfunding ULAs?Hi everybody, I've found someone who's willing and able to make another production run of the Plessey ULA6C001E-7. We're not talking small amounts …

    One important point about the 128 ULA's though - they output RGB levels directly, so the analogue side of things may not be a problem there, allowing a direct FPGA/CPLD replacement :)

    B
    balford balford July 2014 Hardware
  • Crowdfunding ULAs?Hi everybody, I've found someone who's willing and able to make another production run of the Plessey ULA6C001E-7. We're not talking small amounts …

    ... ]One important point about the 128 ULA's though - they output RGB ... issue for a plug in ULA replacement is that of space ...
    guesser guesser July 2014 Hardware
  • Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…

    I'm guessing the 128 ULA draws a fair bit of ...
    balford balford July 2014 Hardware
  • Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…

    [QUOTE=balford;781190]I'm guessing the 128 ULA draws a fair bit of extra power also.[/quote]

    It shouldn't do. It's virtually identical to the one in the previous 48K model.
    chev chev July 2014 Hardware
  • Spectrum items for saleI have many Spectrum items like Spectrum, Spectrum +, power adapters, Centronics Interface, Kempston Interface, Light Pen Interface(these are built b…

    ...
    7. Several 48 ULA
    8. Some 128 ULA
    9. 2 ... . Several Casings for 48,48+, 128
    14. Several working and ...
    techiecal techiecal August 2014 Sales
  • Youtube vids of US guy converting speccy into handheldDidn't see it posted here but thought it was a pretty interesting project. Part 1 and 2 here, more to follow. [youtube]6GcwcyL9LgM[/youtube] [you…

    ... getting colour output from the ULA to the screen though, as ... IC (LM1889) that converts the ULA's YUV output to composite ... will he twig that the 128 ULA gives him RGB :)

    balford balford August 2014 Hardware
  • Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…

    ... discrete logic implementation of the ULA. The 128 ULA isn't that much ... different internally from the 48 ULA - the ...
    Peter Mulholland Peter Mulholland April 2016 Hardware
  • Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…

    [quote="MatGubbins;858667"]How about 'Just Speccy"
    http://www.retrogamescollector.com/hands-on-with-the-just-speccy-128-by-zaxon/[/quote]Just Speccy uses a Sinclair/Amstrad 128 ULA. So it's not a Harlequin as such.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK April 2016 Hardware
  • ZX Spectrum spare parts : "endangered" and functional "extinctions" only It struck me how some Spectrum spare parts or parts that were used with Spectrums and that were commonly available are no longer available . The em…

    128 ULA replacement boards (SLAM128, designed by Mark Smith) are available from time to time on SellMyRetro. Also, new cases will be available soon courtesy of Retro Radionics.

    B
    balford balford March 2017 Hardware
  • Multiface 128 problemHello everyone i have a 48k plus speccy which i firstly thought was working perfectly. It passed all the test of the official Sinclair test tape (cpu…

    ... Sinclair test tape (cpu, rom, ula, ram) so i thought it ... /> Today i bought a multiface 128 from ebay, On this particular ...
    gtsamour gtsamour November 2006 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... ok.However whenever the spectrum 128+ is connected on that channel ... a faulty Ferranti ULA chipset?

    Unfortunately spectrum 128+ does not ... tv.

    If ULA is the problem does anyone ... know if there are replacement ULA chips?I know that ...
    Msx2 Msx2 July 2007 Hardware
  • 128 I/O portsIn The Spectrum Hardware Manual there is a small circuit on page 71/72 to allow 128 I/O ports by using IORQ+A7 to override IORQGE, so any I/O access …

    ... page 71/72 to allow 128 I/O ports by ... with A7=0 prevents the ULA from responding, so freeing ... high to doubly ensure the ULA is not selected. A ... and IORQGE=0. A faulty ULA responds when IORQGE=0, ignoring ... br />
    Looking at the 128 I/O ports patch, it ...
    Jonathan Harston Jonathan Harston November 2007 Hardware
  • 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 ... the CPU to fix a ULA bug (p71). The following ... transistor patch and the Dickens 128-port patch both being ... Can anybody explain why the 128-port patch doesn't work ... hardware patch that disables the ULA when A7=0?
    ...
    Jonathan Harston Jonathan Harston September 2010 Hardware
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... memory address generated by the ULA (who wants to read ... two addresses. Therefore the ULA reads the data from an ... ). After that 128T, the ULA is busy drawing the border ... the remaining 228-128 = 100T (or 224-128 = 96T on ... of a screen line (128 tacts) so that R ...
    Hikaru Hikaru January 2014 Development
  • Toastrack ULA QuestionDid any of the toastracks have the +128 grey ula with Amstrad printed on them?

    Did any of the toastracks have the +128 grey ula with Amstrad printed on them?
    zedexspectrum zedexspectrum July 2014 Hardware
  • New colour palette for 16K/48K/+ machines, based on ULA YUV voltagesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …

    ... ’s book The ZX Spectrum ULA.

    This colour palette ... use the original Sinclair Ferranti ULA, 5C102E, 5C112E or 6C001E. It ... is not suitable for 128/+2/+3/+2A machines, as ...
    rga24 rga24 February 2018 Emulators
<1234567…34>

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