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<1234567…34>
  • SP and IM2 woesI have a function that writes the backbuffer to the screen using the method by which SP is stored, I "POP" a load of registers and then chnge SP to t…

    ... />
    I want to put interrupt driven sound and music in ... soon as I Enable the IM2 interrupt, the screen gets corrupt (All ...
    robpearmain robpearmain November 2009 Development
  • Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…

    ... , you cannot really use IM2 interrupt mode on 16k models, which makes synchronization ... look at many early classics 16k, e.g. "Galaxians". You probably ...
    introspec introspec June 2013 Development
  • Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before! It's all about how to …

    ... IM2 up and working with a simple EI,RET interrupt ... />
    halt ;Wait for interrupt
    call drawsproffscr ;Draw offscreen ... is synchronized with the IM2 interrupt when the sprite has ... of the sprite at every IM2 interrupt? Perhaps I should only ...
    ekoman ekoman July 2004 Development
  • Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…

    When my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing.

    I know I need to wait about 14300T after interrupt but how can I tell if the ULA is now past the border and onto the screen?
    robpearmain robpearmain September 2004 Development
  • Doubling the Spectrum's resolution?Before the advent of digital, PAL TV sets had a resolution of about 702x576 pixels. It was overscanned (i.e. the edges of the broadcast picture would…

    ... 128k display page with an IM2 interrupt routine, it should be possible ... telling it to skip one interrupt cycle.

    2. To ...
    ajmoss ajmoss October 2009 Hardware
  • that "listing variables during runtime" thingWell, I did eventually finish this, but with my meds playing up I don't have much time each day that I can spend at the computer, so it's taken rathe…

    ... ... rather than writing a separate IM2 interrupt routine I decided to use ...
    Battle Bunny Battle Bunny November 2013 Sinclair Basic
  • Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…

    ... buffering code is simply an IM2 interrupt that checks to see whether ...
    dave18 dave18 May 2017 Development
  • Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…

    ... channel A on every vbl interrupt (which the Spectrum has) ... able to use the 50Hz interrupt to change tone but probably ... that contains information on the IM2 interrupt mode. Go to my webpage ... off not using the vbl interrupt.

    About another ...
    Alcoholics Anonymous Alcoholics Anonymous September 2003 Development
  • C, Z88DK and the Sprite Pack Library I wrote a short demo that shows a taste of what can be done from C on the Spectrum: [url="http://justme895.tripod.com/zqa/pacmen.zip"]http://justme…

    ... />
    + Complete support for the IM2 interrupt mode.

    + Rectangle, Interval ...
    Alcoholics Anonymous Alcoholics Anonymous September 2003 Development
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ... sprite is rendered for each IM2 cycle. But remember that you ... area
    Wait for the IM2 interrupt (using the HALT command)
    ekoman ekoman July 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... tried could properly recognize/handle IM2 user defined routines. The code ... and whether you override the IM2 interrupt. An interesting question arises is ... Heavy on the Magic had IM2 (which is kinda understandable, since ...
    Erlstoned Erlstoned August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... the emulator doesn't support IM2 invocation based on the acceleration ... code I placed on an interrupt vector would run on some ... .
    2) Emulators handle the IM2 interrupt "correctly" except they don't ... any code placed on IM interrupt.

    Oh yes, ...
    Erlstoned Erlstoned August 2004 Development
  • Z80 QuestionCan the instruction EX DE,HL be prefixed with DD to give EX DE,IX? Derek

    ... MOS's description of the IM2 interrupt acknowledge as being different from ...
    Alcoholics Anonymous Alcoholics Anonymous August 2005 Development
  • wouldnt it be good if:I know that some guy basicly said he waqs going to do what Im suggesting here but anyway: I was thinking and worring about the future of the spectrum…

    ... , binary search, block memory allocator, im2 interrupt lib, doubly linked list data ...
    Alcoholics Anonymous Alcoholics Anonymous August 2005 Sinclair Miscellaneous
  • How can I tell if 128k in codeIs there an easy way in code to check if the Spectrum has 128k, rather than 48k so I can display a message "Must have 128k" etc

    ... . For this, set up an IM2 interrupt which does, something like XOR ...
    icabod icabod March 2006 Development
  • Timex 80 column display driverI subsequently wrote an 80 column font driver for 512x192 mode.

    ... fixed-time subroutines into the IM2 interrupt. Stuff like text scrolling or ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Development
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... IY register and Basic's interrupt service routine assumes it has ... is to create your own IM2 interrupt service routine.

    The ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Adding AY music to your plogramI'd like to add some nice tune to my program written in machine code. I am not new to assembler programming but with music programming I have no expe…

    ... If I understand correctly: an interrupt is an event which happens ... QUOTE]

    The 50Hz interrupt is used to measure time ... to set up your own im2 interrupt routine that replaces the one ... game isn't using an im2 interrupt routine, but is instead relying ...
    Alcoholics Anonymous Alcoholics Anonymous March 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…

    ... 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
  • 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…

    ... br />
    [b]interrupt.h, interrupt.c[/b]

    z88dk has an im2 interrupt library that allows us to ... im2 library for execution during the spectrum's 50Hz interrupt. ... scroll_isr(void) // an interrupt routine called every 1/50s ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Development
  • Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…

    ... to BASIC after setting the interrupt handler up, as 90% of ... />
    Any simple IM 2 interrupt routine I write myself (like ... works via an IM 2 interrupt handler as long as I ... BASIC after setting up the IM2 interrupt handler with the chip music ...
    Digital Prawn Digital Prawn March 2008 Sinclair Miscellaneous
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... Czech games (proxima software) use IM2 interrupt with vector adress #38-#3A ...
    velesoft velesoft April 2008 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... Czech games (proxima software) use IM2 interrupt with vector adress #38-#3A ...
    glancaster glancaster April 2008 Development
  • How do you make AY sound?Are there tools? Or is it all done in assembler? Any tutorials around for people who like things explained in simple terms? Ta!

    ... the player routine once every interrupt to play back the music ... probably want to use an IM2 interrupt routine eventually so that you ...
    Digital Prawn Digital Prawn June 2008 Development
<1234567…34>

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