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<1234567…34>
  • updated Fatware - keyboard patchHi! I work with Fatware code and already prepare keyboard patch for original version 0.12. Now it's possible to operate disk browser with keys: 1) c…

    ... ....

    - fix bug in interrupt IM2 ( fixed only in FATWARE version ...
    velesoft velesoft January 2009 Development
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…

    ... the program counter is when im2 is called

    ... /> RET


    ;prepares interrupt handling
    initIM2:


    ; 0FD00 - 0FDFCH Reserverd for IM2 Interrupts

    ORG 0FDFDH ...
    robpearmain robpearmain August 2004 Development
  • How can I see how long it took for IM2 to runHow can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken…

    How can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken from entering the IM2 routine to RETI
    robpearmain robpearmain October 2004 Development
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…

    ... data bus at interrupt time, thus meaning that IM2 is slightly more ...
    Philip Kendall Philip Kendall March 2009 Hardware
  • 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
  • The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…

    ... bus, messing around with the interrupt routine address calculation.

    IM2 table, but if space begins ...
    mcleod_ideafix mcleod_ideafix August 2012 Development
  • z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…

    ... // place z80 in im2 mode with interrupt vector table located at ... br />
    ; pointers to interrupt routine.

    defb ... ; set high byte.
    im2 ; select interrupt mode 2.
    ei ; ...
    slenkar slenkar October 2013 Development
  • Yet another TR-DOS questionI have yet another TR-DOS problem. I am using "LD C, command; CALL #3D13" to call the system functions. The problem is that TR-DOS automatically enab…

    ... after the CALL, occasionally an interrupt will get in exactly after ... is in IM1, the default interrupt code in the ROM will ... can't switch to IM2 and vector the interrupt to something harmless ... 't seem to work in IM2 !

    Does anyone have ...
    GOC GOC November 2003 Development
  • IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…

    ... my game Ragnar Revival in IM2 and use HALT to sync ... two Z80 files, one with IM2 for synchronizing screen manipulation (a ... ) using HALT, and one without IM2 and HALT.

    ... Basic


    ;prepares interrupt handling
    prepint
    ld ...
    ekoman ekoman July 2004 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
  • Interrupt driven code at overclocked pace....Is it possible for a MC coder to do a routine (i.e. interrupt music player, for within/during Basic)if he knows said machine is running at 400 percen…

    ... do a routine (i.e. interrupt music player, for within/during ...
    CKay CKay August 2004 Sinclair Miscellaneous
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... FE
    IM 2 ; SELECT IM2
    EI


    ; **** END INTERRUPT ROUTINE ***


    WRITECHAR ... /> ; 0FD00 - 0FDFCH RESERVERD FOR IM2 INTERRUPTS

    ORG 0FDFDH ...
    robpearmain robpearmain September 2004 Development
  • Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …

    ... FE
    IM 2 ; SELECT IM2
    EI

    ... RETI


    ; **** END INTERRUPT ROUTINE ***


    WRITECHAR ...
    ; 0FD00 - 0FDFCH RESERVERD FOR IM2 INTERRUPTS

    ORG 0FDFDH ...
    robpearmain robpearmain September 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
  • Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?

    How long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
    Philip Kendall Philip Kendall February 2005 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    I subsequently got a working IM2 routine.
    chev chev March 2006 Development
  • [NO NAME PROJECT] contributionhi to all. im writting new-super-mega game. it will be finished this century. :) so what is going on ? in the game (an arcade adventure) player can …

    ... for your code

    -interrupt can't be hi-jacked ... it will run
    with IM2 and it will take about ...
    Fikee Fikee December 2008 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
  • IM2 Loading on +3EHi there Speccy Guru's, As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and demos and i've…

    ... moved onto the IM2 loading demos. These use IM2 to play music ... advice on how to do IM2 loading on real hardware... It ... using a full 257 byte IM2 table, so it's not ...
    nuggetreggae nuggetreggae April 2010 Development
  • Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…

    ... border (using a short interrupt routine in IM2 to make sure of ...
    ajmoss ajmoss April 2010 Hardware
  • Xmas / NY present for all ZX UsersHi there, wasn't sure where this should go, but this is a couple of years "work" during free time while not in the office. This is a package of 480 o…

    ... , TAPs, snapshots, multiloads, IM2 loaders etc etc ), and interrupt fixed (no more ...
    nuggetreggae nuggetreggae December 2010 Development
  • IM2 calls to player routine on 128k?Hi all, Apologies for being crap, and not even in a funky, skillo kind of way but it's been over 20 years since I last wrote anything in machine cod…

    ... , ISTR I'd use an IM2 ISR to make noise while ...
    SnakeOilSteve SnakeOilSteve March 2011 Development
  • A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…

    Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how easy it actually is. (Actually I've already published this one some time ago, but this time the source is ...
    Timmy Timmy January 2012 Development
<1234567…34>

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Related Threads

  • Interrupt driven code at overclocked pace....Is it possible for a MC coder to do a routine (i.e. interrupt music player, for within/during Basic)if he knows said machine is running at 400 percen…
  • IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it<br /> <br /> Note, for 48k spectrum using TASM<br /> <br /…
  • How can I see how long it took for IM2 to runHow can i see how many cycles it took for my interrupt routine to run, is there some way with Spectaculator debugger etc to see how long it has taken…
  • Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
  • Assistance with IM2 routineI subsequently got a working IM2 routine.
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…
  • 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…
  • IM2 Loading on +3EHi there Speccy Guru's,<br /> <br /> As some of you know, I've spent a while building the ultimate image for +3e, it's currently at 6000+games and de…
  • IM2 calls to player routine on 128k?Hi all,<br /> <br /> Apologies for being crap, and not even in a funky, skillo kind of way but it's been over 20 years since I last wrote anything in…

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