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Search Again :: Adv Search 1000 results in 0.413s
<1234567…34>
  • 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…

    ... /> So:

    - Ports with A0 low are contended at the 2nd T-state
    - Ports with A0 high are uncontended
    - Ports with a high byte ...
    csmith csmith September 2007 Emulators
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... starts always at the same T-state (related to the moment the ULA triggers the INT line ... , and the main loop is full of HALT instructions, with some instructions ... to check for a key press and close the ...
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • Which ZX games are you playing at the moment?Hi! KiloByte e-zine is finally going to be released by the end of this month (at least I hope so ;) )... SOOOO.... We wanna know what games you a…

    ... released by the end of this month (at least I ... are playing at the moment...

    Vote for 5 games you are playing at the ... moment. Give the game you like most 10 points, 2nd ... ... And don't forget to state that you are voting for ZX ...
    bjohnnybravo bjohnnybravo December 2003 Games
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... cycles are missing. Some time ago, I tried to do this with ... slowed. If it's low at the rising edge of the Spectrum clock, it ... driven by the regenerated clock will see the change at the correct T-state.
    - Will ...
    Winston Winston September 2012 Hardware
  • for a stupid: what?s NMI?erhm, yes, I?m not familiar with it... :rolleyes: I know the function of a hardware ?snapshot? button from Didaktik M/Kompakt, but I?m not familiar…

    ... the peripheral continues to hold /NMI low after the ... with BUSRQ: NMIs are acknowledged at the end of the ... execution of a complete instruction (ie the state of the ... NMI flip flop is tested in the last T state ...
    Alcoholics Anonymous Alcoholics Anonymous August 2006 Hardware
  • It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…

    ... This makes it compatible with at least the two types of machine I ... the data bus sets the first flip flop when MREQ+RD transition low ... MREQ a short time after the 2nd T-state of an M1 cycle), ... MREQ are deasserted just after the falling edge of the 3rd T-state's ...
    Winston Winston December 2007 Hardware
  • Recommend-me-do - memory card devicesSo, both myself (with a +3 that has a dodgy drive) and my friend (with a +2) are looking at the various options for loading from memory card. What…

    So, both myself (with a +3 that has a ... ) and my friend (with a +2) are looking at the various options for loading ... people recommend as the easiest solution?
    Where are they currently on ... sale?
    And what would be the easiest ...
    merman merman September 2015 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... the timing of the second pair fetch.

    With regards to altering the ... timing in the ... reads video bytes at the correct T-state for software compatibility. There are tricks you ...
    csmith csmith March 2013 Hardware
  • Fantasy Premier League 2014/2015Right then..! The [B]WoS All Stars[/B] league is back with a vengeance..! Come and join, one and all..! [url]http://fantasy.premierleague.com/[/url]…

    ... Jan. Lots of players are joining up with their squads so will ... 2 strikers beginning with "S" who are playing at the moment - Sakho and ... could be without points from the forward line for a while ... whether to change letter, as the wildcard is available again.
    Morkin Morkin January 2015 Chit chat
  • WoS Fantasy Premierleague 15/16If anyone wants to do this again, will get it started early so more people might see it. seems to be less members about since we came back. First gam…

    ... .

    The chips aren't really working for me at the moment as ... 2 strikers beginning with C who are playing at the moment, so the 'captain boost ... and Carroll are all out and Crouch doesn't seem to get ...
    Morkin Morkin August 2015 Chit chat
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... starts always at the same T-state (related to the moment the ULA triggers the INT line ... , and the main loop is full of HALT instructions, with some instructions ... to check for a key press and close the ...
    Einar Saukas Einar Saukas November 2014 Development
  • ZXBaremulator 35th anniversary editionHi, to celebrate the 35th Spectrum anniversary, I've released the first complete Spectrum 48K bare-metal emulator for Raspberry PI. It's available…

    ... is that the contention start isn't being applied at the correct t-state but I ... some reason I think the colours are a little off. But then ... again this could be just the ...
    Arjun Arjun May 2017 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    ... similar technique (both screen bytes at the same T-state). But if you want ... to reproduce exactly the same results of ... my test above, as they are on ... , I just wanted to clear the question "how does it work ...
    weiv weiv October 2019 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    ... similar technique (both screen bytes at the same T-state). But if you want ... to reproduce exactly the same results ... of my test above, as they are on ... also want to understand how the real machines work, and I ...
    Magnus_Krook Magnus_Krook October 2019 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    The second way is right, a real machine can't fetch both screen bytes at the same T-state.
    weiv weiv October 2019 Emulators
  • Test of screen switching timings.I modified the btime.tap test by Jan Bobrowski to explore the timing of screen switching. The new test, ptime-128, produces different results on diff…

    ... 957010"]The second way is right, a real machine can't ... fetch both screen bytes at the same T-state.[/quote]

    In 48K mode my emulator fetches the ... can't really see what that would be. In the end ...
    Magnus_Krook Magnus_Krook October 2019 Emulators
  • 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…

    ... the (non-IO) instructions which are contended at ... the "Snow Effect" with particular values of the ... the ULA.
    (A0 OR ~IOREQ) goes low during T2 of the ... The means that no ULA ports are being accessed, so the ... which T state contention acts, given the A0/IOREQ ...
    csmith csmith September 2007 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... wire" problem, the new ports on the ULA+ should have A0 low as well. When ... all want. Access to the palette registers at each scan line. There ... entries are fetched during the contended period, the border colour load won't collide with them ...
    csmith csmith November 2009 Emulators
  • 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…

    ... ports (A0 low) between 0x4000 and 0x7fff are contended just like the 48K
    Odd ports in the ... same range have the first T-state contended ...
    csmith csmith July 2011 Hardware
  • So what Speccy games are you actually playing at the min?I know this isn't the first ever thread like this but I figured I'd start it for a laugh. Since I'm not really working on anything at the mo' for th…

    I know this isn't the first ever thread like ... really working on anything at the mo' for the last week or so ... game that played like this with it's no jumping ... and weird physics wouldn't really do it for ... and grabbed what I think are the discs I've got ...
    dm_boozefreek dm_boozefreek January 2010 Games
  • 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…

    ... on the state of ~MREQ. When ~MREQ goes low the memory ... that even the (non-IO) instructions which are contended at points when ... do with choosing which contention pattern (because the ULA ... /> [QUOTE]-If A0 is high, all T-states are contended[/QUOTE]

    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... in the IR pair clashing with the ULA address put on the bus, at ... to the ULA.
    (A0 OR ~IOREQ) goes low during T2 of the ... stable until sometime after the high-to-low edge of T1. ... are able to tell how may T-states are contended by counting the states to the ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    ... ll still take me at least a few days ... . Let's start with the basics: are ports addressed by 8-bit ... the other address lines to be used in a low state ... - they know that any port with A0 low will do."

    t force software other than ...
    PeterP PeterP August 2011 Emulators
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... you'd need to decode at least the top three bits (000xxxxx ... and A5 high with A0 low (along with one low bit in the high byte) for ... some did come with 2 joystick ports, but both operated the same keys ... are connected or not. But then again, one doesn't disrupt ...
    joefish joefish June 2015 Emulators
  • Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…

    ... -in Sinclair 1 and 2 ports, and it mirrors its Sinclair ... , and A5 high with A0 low (along with one low bit in the high byte) for ... together with either Sinclair 1 or Sinclair 2, and looking at the code ... that are made in greater bulk even if you don’t use the ...
    zub zub June 2015 Emulators
  • PLKON 2003 - AT THE TOP OF THE SPECCY AGELife is beautiful "thing", which pass like a water, and which no one of us repeat it. So every moment is needed to be used bellyfuly. Someone is doin…

    ... "become
    closer". So T.C.G. are pleased to invite you ... :

    PLKON 2003 - AT THE TOP OF THE SPECCY AGE

    - social room with TV
    - showers
    - ... /> More info (maps, etc.) are on T.C.G. homepage - [url="http ...
    Wixet Wixet August 2003 Announcements
  • How stupid is the (British) nanny state?I was watching Steptoe and Son a few days ago. It was on at 11pm on satellite, and was black and white, and made in the mid 1960s. It was an episode …

    ... watch a cultured film at the local cinema, and Albert ... cinema), and look at the outside boards, which are full of nude ... the viewers, but now, in 2009, at 11pm, they were pixelated out - low ... yet the same satellite station shows violent films with realistic ...
    ewgf ewgf June 2009 Chit chat
  • OMD at the Vintage Computing FestivalJust got this via Farcebook: (Also add to the list of speakers our very own [B]csmith[/B] on the Spectrum ULA) NEWS RELEASE A walk on the geek side …

    ... /> A walk on the geek side with OMD at Britain's first Vintage ... lead organiser. "Already in the line-up are Sophie Wilson - co-designer ... .

    "We are delighted to be playing at Bletchley Park and ...
    Winston Winston April 2010 Announcements
  • Games you had at the time, but didn't appreciate until laterThere are a few Speccy games that I had at the time, but didn't realise how playable they were until many years later when I took a fresh look. A co…

    ... are a few Speccy games that I had at the time, but didn't ... a simple shooter at heart but with a wonderful gameplay mechanic ... rewards your skill with progression through the pyramid's chambers.< ... well crafted arcade platformer, with more depth than you first ...
    Mousey Mousey July 2011 Games
<1234567…34>

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