| Re: [hatari-devel] Hatari v1.7 release? |
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On 19/05/2013 19:45, David Savinkoff wrote:
> Hi,
>
> On Atari-Forum, Paulo said:
>
> "Checking and unchecking the option has an immediate speed effect
> on the demo." (floppy; fast or accurate option check box)
>
> The Floppy disk controller and Video have the DMA in common. Could
> Hatari's Floppy code be changing something in the DMA that affects
> Video timing?
>
> David
>
>
Hi,
floppy and video don't have DMA in common, what do you mean exactly ?
> DS: I thought they did, however, checking schematics the shifter is separate.
As for the disk speed option, checking/unchecking the fast/slow mode
will immediatly change the FDC timings, which means sectors will be read
at a different speed and this seems to be the cause for the slow down in
the demo : floppy data are not coming at the expected rate, so I guess
the depacker is pausing somewhere and the 3D is not refreshed soon
enough to keep a correct rate.
Hopefully, I should have a fix for this soon.
Nicolas