Re: [hatari-devel] New, not emulated 'feature' used in a demo

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 24/07/2024 à 08:07, Adam Klobukowski a écrit :
> (I think you're aware of this, but if not - please read)
>
> New demo was released on Sommarhack 2024: Ika I Compofylla 
> (https://demozoo.org/productions/352745/ 
> <https://demozoo.org/productions/352745/>). It uses a new and 
> undocumented 'feature': bus noise.
>
> It sets video screen memory outside of physical memory. This makes 
> shifter display bus noise. By cleverly manipulating what shows on the 
> bus, this noise is controlled and graphics are displayed. The advantage 
> of doing it is you can modify what is being displayed just by reading 
> memory (no write needed).
>
> Description by demo coder: https://beyondbrown.mooo.com/post/anatomy/ 
> <https://beyondbrown.mooo.com/post/anatomy/>
>
> I hope Hatari can/will emulate this behaviour soon :)

Hi

thanks for the pointer, but I was already working on this :)

I saw the demo on the live feed at sommarhack 24 + hatari already 
supports that bus activity is visible on non existent RAM. The missing 
piece is to customise the display rendering routines to put this on the 
emulated screen (as this is a non standard, possibly more cpu intensive 
process it was not done before)

Nicolas