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  • what does the instruction im do?me again with more questions sorry :D finally got myself a book on machine code from ebay. whilst reading it it listed the command im with the warn…

    ... '.

    It changes the Interrupt mode of the Z80 between ...
    mestor mestor December 2005 Development
  • Any HTML experts here?[url="http://82.13.65.36/sinclair-heaven/viewer.php?mag_id=32"]http://82.13.65.36/sinclair-heaven/viewer.php?mag_id=32[/url] Looks great in firefox,…

    It looks fine in 1280x960. A cursory glance suggests the problem is with the tables and your Sinclair Heaven title. Shrinking down this table and banner image sorts things out.

    Let me know if you need any help, I'm a web designer by trade.
    alchresearch alchresearch December 2005 Chit chat
  • ZX Advance on the DS....It's fantastic!!! I new soon or later I was bound to get a DS, even though I have Zero time to play with it, and I am glad I did!! First thing I did …

    ... resolution!!! No hardware streaching or shrinking, no huge borders(although some ...
    Arm73 Arm73 December 2005 Sinclair Miscellaneous
  • ZX Advance on the DS....It's fantastic!!! I new soon or later I was bound to get a DS, even though I have Zero time to play with it, and I am glad I did!! First thing I did …

    ... resolution!!! No hardware streaching or shrinking, no huge borders(although some ...
    mel the bell mel the bell December 2005 Sinclair Miscellaneous
  • info for write a emulatorHello Recently, i speak with a german programmer and he says me that in WOS there are a section emulators programmers, where find information about …

    ... /> Execute the end-of-frame interrupt code.
    Update the display ...
    Dunny Dunny January 2006 Emulators
  • Funniest Spectrum-related memorySeeing the emulated loading screen on the Dreamcast speccy emulator reminded me of something from many moons ago. I was in the local computer shop w…

    ... should be run in an interrupt. Ho-hum.
    icabod icabod January 2006 Sinclair Miscellaneous
  • Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …

    ... 'll need to be in Interrupt Mode 2).

    Again ...
    icabod icabod February 2006 Development
  • Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …

    ... to setup the vertical blank interrupt, and read the keys (plus ...
    addictive1 addictive1 February 2006 Development
  • Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …

    ... when the ULA's vbi interrupt occurs, the z80 reads a ... can also find a generic interrupt service routine that is able ... hooks on a specific interrupt vector. When an interrupt occurs, each of ... hw responding to the same interrupt. Each hook is the ISR ...
    Alcoholics Anonymous Alcoholics Anonymous February 2006 Development
  • 128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…

    ... going to change. If normal interrupt code is to run, then ...
    Fikee Fikee February 2006 Development
  • 128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…

    ... on 49152
    wait for interrupt
    set bank 7 to ... both banks
    -wait for interrupt when switching normal/shadow screen ...
    Fikee Fikee February 2006 Development
  • Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…

    ... Cisco Heat by moving the interrupt table (years ago, before I ...
    Jmk Jmk February 2006 Games
  • Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…

    ... , LDIR it into the old interrupt table, poke a couple of ... data bus and cause the interrupt to read from 0x03?? instead ...
    Jmk Jmk March 2006 Games
  • Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …

    ... 't noticed is that an interrupt is about to occur (the ... I=47665/256=186. The interrupt vector table will be located ... the byte is 'X', the interrupt will jump to address X ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Sinclair Basic
  • Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …

    ... be very simple. Then the interrupt service routine for up to ... something for really fast realtime interrupt response... who knows.

    interrupt. The hw would make the ... o/s call; an NMI interrupt generated by a timer would ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Sinclair Basic
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... BC (or whatever) then... Another interrupt crashes in!

    Marcelo ...
    Marcelo Marcelo March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... the end of Basic's interrupt routine reenables interrupts and there ... 't happen because of pending interrupt. Probably not the cause here ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... make the assumption that the interrupt will jump to the address ...
    icabod icabod March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... of info...
    When the interrupt occurs, the I register is ...
    icabod icabod March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... of hardware could cause an interrupt and put a certain value ...
    icabod icabod March 2006 Development
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... mouse. I usually park its interrupt handlers on vectors 0 and ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Development
  • 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

    ... this, set up an IM2 interrupt which does, something like XOR ...
    icabod icabod March 2006 Development
  • Determining 50hz/60hz in softwareHow can you determine in software if you are running at 50hz or 60hz?

    ... are very similar.

    Interrupt routine:

    IM2C LD ...
    piters piters March 2006 Development
  • Timex 80 column display driverI subsequently wrote an 80 column font driver for 512x192 mode.

    ... -time subroutines into the IM2 interrupt. Stuff like text scrolling or ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Development
  • MEMPTR finally crackedThis post is mainly for emulator developers. As you may be well know there is a misterious internal register in Z80 CPU (MEMPTR) which value is set …

    ... .info), then in IM0 mode interrupt length is 12 tacts (on ...
    Vladimir Kladov Vladimir Kladov April 2006 Emulators
  • z88dkHello. I'm an spanish user of spectrum (and naturaly of this page). I have a question. I want to start to program games with z88dk, but I need a goo…

    ... , whether that be in an interrupt or not.
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Development
  • Tomahawk on PocketCliveAnyone knows why Tomahawk crashes on PocketClive 2B?

    No. If you really wanted a guess, I'd say the lack of retriggered interrupt handling in the Z80 core, but someone would have to go through the game with a debugger to confirm if that's a possibility.
    Philip Kendall Philip Kendall April 2006 Games
  • Tomahawk on PocketCliveAnyone knows why Tomahawk crashes on PocketClive 2B?

    ... say the lack of retriggered interrupt handling in the Z80 core ...
    Uros Zupan Uros Zupan April 2006 Games
  • ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…

    ... isr distinguish from 3 different interrupt sources.

    Just adding ...
    Alcoholics Anonymous Alcoholics Anonymous April 2006 Hardware
  • A hyperthetical Speccy FutureDo you think if the Speccy had've continued through the 90's or maybe up until present day, that maybe they would've made multi-button joysticks/pads…

    ... up so long due to shrinking transistor sizes allowing faster context ...
    cyborg cyborg April 2006 Sinclair Miscellaneous
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