World of Spectrum
  • Categories
  • Discussions
  • FAQ
  • Sign In
Home › Search
Title Search
@title beer Word 'beer' in title
User Search
  • @user admin Only posts by Admin
Text Search
  • @body beer Word 'beer' in the text
Phrase Search
"Hello World" Exact phrase match
Exclude Terms
  • car -red Search cars that are not red
"Or" Searches
  • honda | bmw 'honda' or 'bmw' results
Multi-Field
@(title,body) hello Both contain 'hello'
WildCard
  • hond* civ* Match all with an astrix
Combination
  • @title bmw @user admin
See more supported syntax examples
Search Again :: Adv Search 1000 results in 0.009s
<1…17181920212223…34>
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... Chris's book about ULA the IO contention shouldn't depend on ... above yet, but the IO contention [I]can[/I] depend on ... of T2 and "cancels" the contention. See page 206.

    contention won't be affected by ...
    csmith csmith July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... a 48K 6C ULA for comparison?

    The contention circuit is ... MREQ going low latches the contention state until the end of ... the contention period - which suggests it has ...
    csmith csmith July 2011 Hardware
  • 128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…

    ... same test on a 48 ULA, because I don't ... have any spare ULA and it is well ... pulses are missing. The contention period start at the third ... You have written book about ULA 48 but it is impossible ... any information about ULA 128 or ULA +3 or ULA in ZX ...
    vranik vranik July 2011 Hardware
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    Yes, I read about memory contention, but I didn't even ... programs/games/demos where precise timing is crucial and I even ...
    PeterP PeterP August 2011 Emulators
  • 48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…

    ... ]But it looks, that multicolor timing is uncorect and sometimes demos ... . ZX Spectrum 48 contain different ULA chip than on ZX128. On ... 128kB is about 95%, screen timing and CPU timing is different.
    velesoft velesoft August 2011 Hardware
  • 48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…

    ... like CPU overclock or even ULA replace for this one from ... /> ZX48 use different ULA chip with different screen timing. Is impossible (or ...
    velesoft velesoft August 2011 Hardware
  • Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?

    ... used to add proper memory contention support to SimCoupe :)

    timing and flags affected.[/quote]
    obo obo October 2011 Development
  • 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 ... in detail in the memory contention chapter....

    Cheers
    csmith csmith October 2011 Hardware
  • playing sound samples from Boriel's zxbasic-compilerfirst of all, sorry if it sounds confusing if i'm posting this thread here instead instead of at Discussions:SinclarBasic it's because this is more …

    ... above 32768) so that the ula doesn't introduce random delays ... be secondary. I've added timing to the source below to ... to be fetched so the timing can be examined from ... as I thought since the timing is correct when a ... a 49 cycle error in timing, which is 49/(49+ ...
    Alcoholics Anonymous Alcoholics Anonymous October 2011 Development
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... by messing about with video timing is possible, but messes with ... all the other timing. Not nice. You can get ... />
    The great thing about ULA plus is that it is ...
    csmith csmith October 2011 Development
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... features added to a replacement ULA is different. One such feature ... with interrupt to first scanline timing.

    If someone does ...
    csmith csmith October 2011 Development
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... =Philip Kendall;574230]Because the timing of your IM2 routine has ... value 100% compatible with old ULA
    OUT Linecounterport,128 = do ...
    LCD LCD October 2011 Development
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... features added to a replacement ULA is different. One such feature ... with interrupt to first scanline timing.

    If someone does ...
    antoniovillena antoniovillena October 2011 Development
  • Spectrum real speed testI don't have a real Spectrum, but I have a Romanian clone (HC-91). I always believed it was a perfect clone of Spectrum, but it turned out not to be…

    Most European clones don't have any contention on the ULA-paged banks, so they will appear to be faster. Try running ZXSpin with contention turned off, and see if the speed matches your Romanian clone.

    D.
    Dunny Dunny October 2011 Sinclair Miscellaneous
  • Spectrum real speed testI don't have a real Spectrum, but I have a Romanian clone (HC-91). I always believed it was a perfect clone of Spectrum, but it turned out not to be…

    ... on ZXSpin with the 'No contention' option enabled and there is ... Romanian clone appears to have ULA-CPU contented memory, because if ...
    Bothkill Bothkill October 2011 Sinclair Miscellaneous
  • Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…

    ... time on developing something like ULA++ with hw scrolling.. let him ... work on real hardware with contention etc when it eventually arrives ...
    guesser guesser November 2011 Development
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... , with a 48K ULA which does I/O contention, I should go ... for a 128K contention pattern, as the 128K ULA does implement I ... /O contention as well. Well ... 't think that I/O contention is a big issue for ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... with a 48K ULA which does I/O contention, I should go ... for a 128K contention pattern, as the 128K ULA does implement ... I/O contention as well. Well ... : essentially the 48K/128K ULA applies contention at every available opportunity, ...
    Philip Kendall Philip Kendall November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... release a ULA replacement, this ULA should have to implement contention as per ... Chris explains) as the +3 ULA is (sadly) a nightmare to ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... developer would have noticed the timing was wrong when coding, and ... /> My advice, make the bank contention model switchable - either a jumper ...
    csmith csmith November 2011 Hardware
  • What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…

    ... ;583148]Working out the interrupt timing will be fun. It looks ... to probe anything on the "ULA" of this machine requires first ... figure out which signals this ULA generates and what pins they ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... /> Any emulator that does accurate contention will emulate that perfectly well ... using? Note that late timing or early timing settings in the emulator ...
    Arjun Arjun December 2011 Games
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... ]Any emulator that does accurate contention will emulate that perfectly well ... using? Note that late timing or early timing settings in the emulator ...
    weesam weesam December 2011 Games
  • 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…

    ... -an-image-t653.html"]ZX81 ULA clone[/URL] lately, I have ... /MREQ, /RD, /WR, /RFSH etc timing at this particular point in ... .

    Now when the ULA makes /RAS low, there's ... later the drive strength of ULA's output gets the upper ...
    RetroTechie RetroTechie December 2011 Hardware
  • Great Giana Sisters (never released)[url]http://www.worldofspectrum.org/infoseek.cgi[/url] daamm, this looks like my ideal game, I love left-to-right platform scrolling games like turb…

    ... ]

    still, lack of ula contention helps a lot. I wonder ...
    Arda Arda December 2011 Games
  • JSpeccy v0.89 Christmas 2011 EditionHi, After seven months of hard work, tonight I've released a new JSpeccy version as my humble Christmas gift for all the community. As my webpage i…

    ... this have the new ULA Plus timing that Andrew was working on ...
    Arjun Arjun December 2011 Emulators
  • Faster CLS...Hi Folks, Looking at the CLS command in the Spectrum ROM disassembly it seems rather complex. Does anyone know of a simpler/quicker routine that wi…

    ... at 21 T-states (plus contention, so 24T a lot of ... it easy to see the timing for single instructions or complete ...
    obo obo January 2012 Sinclair Basic
  • Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…

    ... . So unless you calculate the timing of every other bit of ... /misc/timingtest-0.2.zip"]timing test[/URL] which I have ... #post215794"]this thread[/URL] about contention.

    Once you know ...
    Patrik Rak Patrik Rak January 2012 Games
  • 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…

    ... work to make a 100% timing correct Spectrum clone, as to ... better understand how the ULA works. Until this board was ... Oxmeet about 3 years ago). Timing perfect as in runs even ...
    Winston Winston January 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…

    ... work to make a 100% timing correct Spectrum clone, as to ... better understand how the ULA works...[/QUOTE]

    Sooo ...
    ZnorXman ZnorXman January 2012 Hardware
<1…17181920212223…34>

Latest Posts

  • Happy 40th Birthday to the Amstrad CPC464!
    dmsmith on 6:19PM
  • Another Birthday! The Game Boy Is 35!
    dm_boozefreek on 6:17PM
  • I bought an accoustic guitar. How do you play it?
    Maroc's Other Projection on 6:04PM
  • I am currently watching.....
    Antiriad2097 on 5:05PM
  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21

HitBox

Word Docs Hits
contention 1.4K 2.4K
ula 7.3K 13K
timing 3.3K 4.1K

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…
  • Contention and floating bus timingHello,<br /> <br /> 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.…
  • 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…
  • New test for finding missing +2A/+3 ULA timing detailsHello,<br /> <br /> having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention patt…
  • 5C Horizontal timing vs 6C horizontal timing.Hi all,<br /> <br /> Just considering the timing difference in the video signal between the 5C and the 6C where the 6C ULA seems to have 50% longer…
  • 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 …
  • TimingHey All,<br /> <br /> Is their away of obtaining timing information on ZX128k other than addresses 23672-&gt;23674. Basically I would like to identi…
  • 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?

Related Searches

  • 2a timing
  • 3b ula
  • issue 3b ula
  • harlequin modified ula
  • ula model 2
  • ula
  • zx 2 ula
  • zx 2 ula interchange
  • zx 2 ula swap
  • grey 2 ula swap
  • ula 128
  • ula replacement
  • 2b dead ula
  • black 2 dead ula
  • slam ula
  • contention timing
  • contetion timing ula
  • contention ula
  • 128 ula timing test
  • contention and floating bus timing

Copyright © 2024 World of Spectrum