Re: [hatari-devel] TOS 3.00

[Eero Tamminen <oak@xxxxxxxxxxxxxx>]

Hi,

On 2/9/19 2:15 PM, Thorsten Otto wrote:
> On Samstag, 9. Februar 2019 00:31:53 CET Eero Tamminen wrote:
> > I'm not getting TOS 3.00 to boot in Hatari TT emulation:
> > 	http://www.atari-forum.com/viewtopic.php?f=27&t=35161
> >
> > It's just looping on some MFP register:
> > $00e01ed4 : cmp.l  $04ba.w,d7      24.95%
> > $00e01ed8 : bcs.s  $e01eea         24.95%
> > $00e01eda : btst   #5,$fffffa01.w  24.95%
> > $00e01ee0 : bne.s  $e01ed4         24.95%
>
> Thats a bit strange, because almost the same sequence can be found in TOS
> 3.06:
>
> [00e019ec] b0b8 04ba                 cmp.l     $04ba.w,d0
> [00e019f0] 650c                      bcs.s     00e019fe
> [00e019f2] 0838 0005 fa01            btst      #5,$FA01.w
> [00e019f8] 66f2                      bne.s     $e019ec
>
> It's purpose is to wait for a dma transfer to complete, with a timeout of
> either 3sec or 1/10 sec (the values are shortly before that sequence). Maybe
> something is going wrong with the 200hz timer?

Weird. I'm not anymore able to reproduce the problem, even with
the previous Hatari build.

I have no idea what could have changed, only thing that should
have changed in between is few unrelated distro security updates.

Thanks anyway for checking this!!!


	- Eero