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<1…20212223242526…34>
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... ] HALT Wait for a maskable interrupt.
    DEC BC Decrease the ...
    Rickard Rickard May 2007 Development
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... forgotten to mention -- the ROM interrupt routine assumes the IY register ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Development
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... screen also drawn at every interrupt (each 1/50 second)?
    Rickard Rickard May 2007 Development
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... (I?ts done with a interrupt-driven print routine)

    zx128k zx128k May 2007 Development
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... screen also drawn at every interrupt (each 1/50 second)?
    [/quote]

    Yes, the interrupt occurs just before the top ... it happens just after an interrupt you'll also see no ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Development
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... :

    1) Not using Interrupt Mode 1 (the default). IM ... run. If you set up Interrupt Mode 2 to simply return ... TV vertical retrace, get the interrupt routine in and out ASAP ... to know how to prep Interrupt Mode 2 for this so ...
    BloodBaz BloodBaz May 2007 Development
  • Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…

    ... RET (10) and NOP (4 Tstates)?
    Dr BEEP Dr BEEP May 2007 Development
  • Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…

    [QUOTE=Dr BEEP;193427]Aren't you forgetting the RET (10) and NOP (4 Tstates)?[/QUOTE]

    Nope. 15+22+14=51.
    Patrik Rak Patrik Rak May 2007 Development
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... drawn at 14336 tstates and ends at 57472 tstates, which means that ...
    Philip Kendall Philip Kendall May 2007 Development
  • Does anyone else find Dan Brown suspect?Don't get me wrong, he's a good entertaining [i]fiction[/i] writer -- as long as the emphasis is on "fiction"; unfortunately, he has the annoying hab…

    ... the line "Long before they interrupt interface" (and perhaps others)...
    robert@fm robert@fm June 2007 Chit chat
  • Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…

    ... as a ROM CRC and interrupt test.

    Unfortunately, I ...
    Winston Winston June 2007 Hardware
  • Beautifully programmed gamesJust watching the bobby bearing tzx and admiring the beautiful programming involved. Which other games would you say had asthetic programming opposed…

    ... at the start of the interrupt, and using the stack so ... , as it expected no further interrupt to occur until the next ...
    wokani wokani June 2007 Games
  • 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…

    ... to have this in an interrupt service routine so that the ...
    Alcoholics Anonymous Alcoholics Anonymous June 2007 Development
  • A challenge thats probably impossiblehere's a challenge for all you coders. Given a snapshot, is it possible to create a program to sniff out the original start address for the game that…

    ... typical init code (stack, border, interrupt)
    the third is to ...
    Fikee Fikee June 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…

    ... but not running in the interrupt yet";

    void cls ...
    wokani wokani 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…

    ... but not running in the interrupt yet. I struggled with this ... get this running in the interrupt so that I can improve ...
    wokani wokani 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…

    ... instruction at address 0xd4d4 (interrupt service routine entry)
    ... scroll_isr() is running in the interrupt routine
    [/code]
    interrupt service routine scroll_isr().
    interrupt routines with the generic ...
    Alcoholics Anonymous Alcoholics Anonymous July 2007 Development
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... copies a byte in 16 tstates, so 32 for 2 bytes ... do 2 bytes in 11 tstates - so nearly 3 times faster ...
    bobs bobs 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…

    ... supposed to run in the interrupt.";
    ///////////////////////////////////////////////////////////////////////

    ///////////////////////////////////////////////////////////////////////
    /////////////////////////// Scroll_Isr ...
    wokani wokani 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…

    ... test message running in the interrupt.";
    ///////////////////////////////////////////////////////////////////////

    ///////////////////////////////////////////////////////////////////////
    /////////////////////////// Scroll_Isr ...
    wokani wokani 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…

    ... 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
<1…20212223242526…34>

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