Re: [hatari-devel] Hatari 1.90 devel version sound

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 08/09/2016 à 00:58, Bob Carpenter a écrit :
> Nicolas,
>
> Unfortunately, I could not get Frantick to run from the AUTO folder. However, I did upload an ST image that simply has the Frantick folder and a desktop.inf file. In the Frantick folder, you will find Frantick.prg (along with many other files). Simply start that program with the system type set to Mega STE and the title music will sound very tinny. However, if you change the machine type to STE, the music will sound correct again. In both cases, I had the system set to 16Mhz 68000. In fact, I used the Mega STE config file to start the experiment and simply changed the system type from Mega STE to STE.
>
> It looks like the STE needs to have 2MB in order to use the DMA music.
>
> Here is the ST image:
> https://dl.dropboxusercontent.com/u/16276054/ST/Frantick.zip

Hi

thanks for the ST image, I was able to duplicate the problem and fix it.

cpu freq for Mega STE defaulted to 16 MHz, while in fact it should be 8 
MHz when computing sound samples per VBL (cpu freq can be 8 or 16 MHz 
for Mega STE)

Note : intro music doesn't use DMA sound in fact :) it's ym2149 playing 
samples using MFP timer. I think DMA sound is used only later during the 
game.

The slightly different sound between STF and STE under Hatari in that 
case is because STE mode as an extra step to mix YM and DMA, even when 
DMA is off.


Nicolas