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<1234567…34>
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... get the port issue sorted - contention information (with high accuracy) will ... know how this will affect contention. ULA contention on even ports is complex ... (back and forth between ULA+ and normal ULA mode) on a frame ...
    Dunny Dunny November 2009 Emulators
  • I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…

    ... to lead to the following contention patterns:

    High ... /> in 40 - 7F? | Low bit | Contention pattern
    ------------+---------+-------------------
    No | Reset ... cycles)
    During _reading_ from ULA this can't be right ...
    brian-82 brian-82 February 2007 Development
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... 128k) cycles after the ULA has pulled the INTREQ ... after it happens). The ULA needs to fetch the ... sense it starts applying the contention a few cycles earlier, ... on the bus when the ULA reads them, not later ... real machine but unfortunately ULA in my beloved 48k ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... 0x40-0x7F then the ULA gets confused by the ... it doesn't apply contention to take precedence as usual ... 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 ...
    Hikaru Hikaru January 2014 Development
  • 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, …

    ... got the ULA timing 100% right. We know when the contention pattern ... reliable information about when the ULA actually fetches the screen bytes ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …

    ... 'm trying to understand contention and its implications when some ... O contention. Memory contention causes T1 to be enlarged until the ULA ... br />
    Also: memory contention makes T1 to be enlarged ... instance, to avoid memory contention) that begins at the ...
    mcleod_ideafix mcleod_ideafix May 2015 Hardware
  • Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…

    ... amount of data the ULA is extracting from the ... />
    So can the ULA access memory faster than the ... And then there's the contention pattern where the memory is ... not 8, so the ULA must be fetching 4 bytes ...
    So why does the ULA appear to fetch data in ...
    joefish joefish January 2016 Hardware
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    ... my head around the memory contention issues of the various ... . Also that when the ULA is drawing the screen it ... is "contending" with the ULA for access to the data ... and the ULA has priority. With this ... what is the cause of contention for banks 1,3, ...
    adrian_singh adrian_singh May 2017 Development
  • Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …

    ... sets of RAM, while the ULA/ASIC is wired to read ... reduce the effect of memory contention considerably. Possibly with the addition ... the same address, that the ULA is reading from, would halt ...
    The_Bert The_Bert September 2017 Hardware
  • WANTED: 128k+ or 128k +2(early grey mod.) ULA chipHello, Attempting to repair my 128k+ speccy. Needs a ULA(IC1)chip from either a 128k+ or an early +2 will work also. If anyone has this chip or has a…

    ... 128k+ speccy.
    Needs a ULA(IC1)chip from either a ... 's broken(other than the ULA), please give me a shout ...
    thomas3120 thomas3120 January 2003 Wanted
  • ULA schematicsHi everyone. Some while ago I remember getting hold of some circuit schematics of the innards of the Speccy 48K ULA. Sadly I've since lost the files…

    ... innards of the Speccy 48K ULA. Sadly I've since lost ...
    Laser Laser August 2005 Sinclair Miscellaneous
  • ULA?Just curious, what does ULA stand for - I'm guessing Ultra Large (Gate) Array?

    Just curious, what does ULA stand for - I'm guessing Ultra Large (Gate) Array?
    cg cg November 2005 Hardware
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... is controlled.

    The ULA controls output to the the ... need to change the ROM,ULA and add more RAM ?? or ...
    Saboteur Saboteur November 2005 Hardware
  • Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..

    Hi,
    Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?
    I mean which Z80 clock cycle, T1 or T2?

    Thanks..
    Mp Mp November 2005 Hardware
  • sound input causing dead ula in +2 ?I have a dead +2a (it shows static black screen, no border see: [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=9619&forum=4)"]http:/…

    ... /> I started to think why ula suddenly broke. 'Deadth' posted ... connected tape leads can damage ula.

    Also found ... 1b652469b2ff16c9?lnk=st&q=ula&rnum=18#1b652469b2ff16c9"]http ... 1b652469b2ff16c9?lnk=st&q=ula&rnum=18#1b652469b2ff16c9[/ ...
    Timppa Timppa November 2005 Hardware
  • Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…

    ... a correct map for memory contention?

    Address Size Area ...
    ZJones ZJones September 2006 Development
  • ULA......Woooooo and ULA 160??'ello all from down under ! they don't know the speccy well this way it seems, anyways, picked up my brand new astra yesterday, and it's got some …

    ... plates on it

    ULA 160

    i'm ...
    bleugh bleugh November 2006 Sinclair Miscellaneous
  • ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…

    ... much more accurate "ULA snow" and IR contention. Note that truly accurate ...
    Dunny Dunny December 2006 Emulators
  • ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank

    Hi.

    Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ?
    Also looking for one 7805 heatsink...

    Thank
    Gods Gods May 2007 Wanted
  • 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.

    I 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.
    Gods Gods June 2007 Hardware
  • Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…

    ... support (Stuart Brady)
    [*] Fix contention for LD?R, CP?R ... , as the +2A/+3 ULA applies contention only when MREQ is active ...
    Fred Fred July 2007 Emulators
  • Spectrum ULAHi new to forum ,and have been a speccy owner/fan since the begining{like most 30 somthins on this forum !) Anyway what i want to know is the ULA th…

    ... want to know is the ULA the same from issue 3 ...
    MARKZX MARKZX July 2007 Hardware
  • Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…

    ... ! 8-)

    Both the ULA IO and memory contentions are ... that will test the _memory_ contention
    (or anything else for ...
    csmith csmith July 2007 Hardware
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... and CAS generated from ULA? I think there may ... Ramsoft incorrectly states that ULA doesn't stop CPU ... [LIST=1]
    [*]The ULA address drivers do not open ... I'm curious what exactly ULA is doing then.
    ... reading from it by ULA. The address while bytefetch ...
    brian-82 brian-82 November 2007 Development
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... how the ULA replacement fetches the bytes without any memory contention would ...
    Patrik Rak Patrik Rak November 2007 Emulators
  • Serching for ZX printer ULA and ZX interface I ULAIs there anyone having any spares. In both cases, I swapped ULA's from working equipment which fixed things, so I'm 100% sure it's the ULA that is ca…

    Is there anyone having any spares. In both cases, I swapped ULA's from working equipment which fixed things, so I'm 100% sure it's the ULA that is causing the problem.

    Is there anyone who can help?
    georgedb georgedb December 2007 Hardware
  • Fuse for Mac OS X 0.9.0 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project and shortly here on WoS: [url]http://sourceforge.net/proje…

    ... emulation (Q-Master).
    [*] Fix contention for LD?R, CP?R ... , as the +2A/+3 ULA applies contention only when MREQ is active ...
    Fred Fred March 2008 Emulators
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    ... gang..
    The Speccy 48 ULA Replacement is *almost* here ;)

    Anyway, the machine with ULA replacement doesn't quite boot ...
    csmith csmith April 2008 Hardware
<1234567…34>

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Related Threads

  • ULA......Woooooo and ULA 160??'ello all from down under !<br /> <br /> they don't know the speccy well this way it seems, <br /> <br /> anyways, picked up my brand new astra yeste…
  • Serching for ZX printer ULA and ZX interface I ULAIs there anyone having any spares. In both cases, I swapped ULA's from working equipment which fixed things, so I'm 100% sure it's the ULA that is ca…
  • Where: ZX Printer ULA's and ZX interface I ULA'sIs there any source left for these ULA's? Alot of tings can be replaced, like the ZTX transistors and occasionally you can come accross a normal ZX S…
  • WANTED: 128k+ or 128k +2(early grey mod.) ULA chipHello,<br /> Attempting to repair my 128k+ speccy.<br /> Needs a ULA(IC1)chip from either a 128k+ or an early +2 will work also.<br /> If anyone has …
  • ULA schematicsHi everyone.<br /> <br /> Some while ago I remember getting hold of some circuit schematics of the innards of the Speccy 48K ULA. Sadly I've since lo…
  • ULA?Just curious, what does ULA stand for - I'm guessing Ultra Large (Gate) Array?
  • The ULA and ScreenI've asked something similar before but please bear with me.<br /> <br /> I'm trying to understand the way the screen is controlled.<br /> <br /> The…
  • Z80 cycle contentionHi,<br /> Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?<br /> I mean which Z80 clock cycle, T1 or T2?<br /> …
  • sound input causing dead ula in +2 ?I have a dead +2a (it shows static black screen, no border see: [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=9619&amp;forum=4)"]ht…
  • Memory Map/ContentionHi <br /> I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scr…

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