[hatari-devel] 68030 Debug mode and new CPU

[Nicolas Pomarède]

Le 15/02/2011 21:20, Eero Tamminen a écrit :
> I think the main use-case for stop instruction would be reducing battery
> consumption on a laptop where somebody's running GEM applications
> (as they mostly idle waiting user input) within an emulator like Hatari.

Yes, by sleeping the process will be un-scheduled and it will save cpu 
MHz, hence battery life.

> Only thing on Atari that I know to use stop instruction is EmuTOS.
> Does anybody know anything else?
>

A lot of demos are using stop. Its most common use is "stop $2300", 
which will wait for the next VBL interrupt. It's a qucik way to have 
code synchronised with VBL when you don't want to use $70.

Some demos are also using stop to wait for the next hbl/timer B to be 
sure the colors will be changed at the exact position (+/- some jitter) 
or to remove bottom border.

That why in that case doing a sleep would be wrong, a video line is much 
shorter than 1 ms.

Nicolas