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  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... about 14000 cycles from the interrupt to the top of the ... *8 = 55216 cycles from the interrupt to when the raster catches ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... the end of your scroll_isr() interrupt routine. Specataculator reports T states ... since the interrupt occurred (therefore the count is ... reset to 0 on interrupt) so the T state reading ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ...
    }
    }

    ////////////////////
    // interrupt routine

    M_BEGIN_ISR(isr ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... speed is tied to the interrupt. But the version I put ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • 68000 programming.Anyone here know anything about this? My question is: how does the programmer know how long hisinstructions are? Do determine the operands to branch …

    ... the last instruction in the interrupt handling routine would be an ... there are 8 levels of interrupt?
    wilsonsamm wilsonsamm July 2007 Chit chat
  • 68000 programming.Anyone here know anything about this? My question is: how does the programmer know how long hisinstructions are? Do determine the operands to branch …

    ... has 8 interrupts and 8 interrupt levels. When one of the ... , a vector address for that interrupt is fetched from a specific ... RTE instruction.

    Each interrupt routine has a priority equal ... number. So "int 4" can interrupt "int 3" processing, but "int ...
    Laser Laser July 2007 Chit chat
  • 68000 programming.Anyone here know anything about this? My question is: how does the programmer know how long hisinstructions are? Do determine the operands to branch …

    ... which (eventually) checks if an interrupt has occurred.
    AC is ...
    wilsonsamm wilsonsamm July 2007 Chit chat
  • 68000 programming.Anyone here know anything about this? My question is: how does the programmer know how long hisinstructions are? Do determine the operands to branch …

    ... which (eventually) checks if an interrupt has occurred.
    AC is ...
    Laser Laser July 2007 Chit chat
  • 68000 programming.Anyone here know anything about this? My question is: how does the programmer know how long hisinstructions are? Do determine the operands to branch …

    ... case, don't allow an interrupt to be dealt with till ...
    wilsonsamm wilsonsamm July 2007 Chit chat
  • 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…

    ... be due to the Harlequin interrupt looking like it's 1 ...
    csmith csmith July 2007 Hardware
  • He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…

    ... a little trouble with the Interrupt. At every frame (1/50 ... s), there's an interrupt, yes? And the ROM scans ... the Z80 know that the interrupt should trigger a RST 38h ...
    Where's that AY chip gone... Where's that AY chip gone... August 2007 Chit chat
  • He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…

    Because that's the interrupt mode it's in. You ... can change the interrupt mode with instructions IM0, IM1 ... behaviour by selecting a different interrupt mode. IIRC mode 2 is ... of the addess of the interrupt routine were the same then ...
    Code Monkey Code Monkey August 2007 Chit chat
  • Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…

    ... know of one way of shrinking the game down under the ...
    Digital Prawn Digital Prawn August 2007 Development
  • 7 to 9" TFT screen on SpectrumI'm willing to buy one of those and connect the Spectrum via the Composite Video input. Has anyone tried that? What kind of image quality may be expe…

    ... line of pixels rather than shrinking the BORDER, which is rather ...
    NickH NickH September 2007 Hardware
  • Budget GamesWhch is your favourite Speccy budget game? *And I don't mean full price re-releases* There were some real class Speccy games that you could pick up …

    ... really annoying though)
    Incredible Shrinking Firemen
    Vampire
    Joe ...
    dm_boozefreek dm_boozefreek September 2007 Games
  • Budget GamesWhch is your favourite Speccy budget game? *And I don't mean full price re-releases* There were some real class Speccy games that you could pick up …

    ... really annoying though)
    Incredible Shrinking Firemen
    Vampire
    Joe ...
    Dwayne Dibley Dwayne Dibley September 2007 Games
  • IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…

    IY is used by the rom interrupt routine. If you have im1 interrupts running your program is going to crash.
    Alcoholics Anonymous Alcoholics Anonymous September 2007 Development
  • Budget GamesWhch is your favourite Speccy budget game? *And I don't mean full price re-releases* There were some real class Speccy games that you could pick up …

    ... /> Caves of Doom
    Incredidible Shrinking Fireman

    and no ...
    aktiv8 aktiv8 September 2007 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…

    ... seem start counting from the interrupt (woody's float48k). And yet ... exact time until the next interrupt. Is this perhaps what your ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…

    ... a little trouble with the Interrupt. At every frame (1/50 ... s), there's an interrupt, yes? And the ROM scans ... the Z80 know that the interrupt should trigger a RST 38h ... to have to implement all interrupt modes.

    Once you ...
    Winston Winston September 2007 Chit chat
  • 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…

    ... ) at 0x7ffe 14331 tstates after interrupt, which I think should give ...
    Philip Kendall Philip Kendall 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…

    ... ) at 0x7ffe 14331 tstates after interrupt, which I think should give ...
    csmith csmith 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…

    ... it from when the Z80 interrupt occurs? This is offset exactly ... />
    I mean, the IM2 interrupt takes 19T states to reach ...
    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…

    ... it from when the Z80 interrupt occurs?[/QUOTE]

    I ...
    Philip Kendall Philip Kendall 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…

    ... it from when the Z80 interrupt occurs? This is offset exactly ...
    csmith csmith 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…

    ... be also related to the interrupt sensing? I am not a ...
    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…

    ... be also related to the interrupt sensing? I am not a ...
    csmith csmith 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…

    ... tstates 14335 and 14336 after interrupt do not experience memory contention ...
    Philip Kendall Philip Kendall 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…

    ... tstates 14335 and 14336 after interrupt do not experience memory contention ...
    csmith csmith 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…

    ... 0T annotated as start of interrupt signal). He counts everything relative ... count things from when the interrupt happens. Even if you try ... to align the interrupt with the INTREQ signal, ... zero - unlike the start of interrupt, the start of INTREQ signal ...
    Patrik Rak Patrik Rak September 2007 Emulators
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