Error in Indivision's Denise emulation

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Don't Panic. Please wash hands.
  • Dear iComp team,

    It seems like I've stumbled upon an incompatibility in Indivision's emulation of the Denise chip.

    Could you please test the following demo on a machine equipped with Indivision ECS v2?

    Kefrens Megademo 6…ens/Kefrens-Demodisk6.adf

    Once the intro shows, press the left mouse button once to skip to the first part of the demo.

    Here is a photo of how it looks on my A2000 with an Indivision ECS v2 configured for OCS mode:

    First things first, please ignore the broken scroller at the bottom of the screen - that's because of an ECS Agnus, and does not matter for this bug report at all.

    As you can see from the photo above, the letters K and S are black depending on their position. This shouldn't be the case, and indeed it does not happen on my other Amiga equipped with a real OCS Denise. They should remain coloured at all times.

    According to a discussion in a forum, this does not happen with ECS Denise either, but it *does* happen in old versions of UAE and has been fixed meanwhile:

    Is it possible that Indivision's Denise emulation makes the same mistake?

    I suppose this can be fixed with a firmware update, so I'd be grateful for a fix.

    Thank you very much!

  • Thanks for the report! We'll look into this and develop a fix. For a test case, this is a bit annoying to load, but we may be able to isolate it into a separate routine. Not having watched the demo yet, I assume that this screen uses dual-playfield and sprites, which may be a seldomly-used combination.

  • Thank you, I'm looking forward!

    Megademo 6 is a standard AmigaDOS disk. From a quick test in UAE, it's sufficient to load the executable '1' from a hard disk, with all other files removed (I got this hint from the thread - thanks there!). I hope that helps speed up the initial diagnostics.

    As for seldomly-used, unfortunately this also affects at least one game - please have a look the thread for extensive photo coverage on that, too.

    If there's anything else I can do to help, please let me know.

  • Spread the word about our customer support!

    Anyway, thanks again for reporting this in the first place. We are all demo-watching (and a few even demo-making) guys, but we can't possibly test every single one of them.

  • The last reply was more than 365 days ago, this thread is most likely obsolete. It is recommended to create a new thread instead.