| Re: [hatari-devel] video freq set to 60 Hz instead of 50 Hz for Falcon VGA |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] video freq set to 60 Hz instead of 50 Hz for Falcon VGA
- From: Anders Eriksson <evldhs@xxxxxxxxxxxxxx>
- Date: Wed, 06 Mar 2024 18:05:47 +0000
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On Wednesday, 6 March 2024 at 14:48, Nicolas Pomarède <npomarede@xxxxxxxxxxxx> wrote:
> Le 06/03/2024 à 14:29, Nicolas Pomarède a écrit :
>
> > Hi
> >
> > I didn't try screenpain yet ; when generating asm source for vga 32 Mhz,
> > can you compare it to vga 25 Mhz to see what is changing ?
> >
> > I had the feeling that register-wise only bit 2 in ff82c0 was involved
> > in RGB/VGA, by setting clock to 25 or 32 MHz.
> >
> > I don't see which setting allows vga with a "non vga" clock.
>
>
> nevermind, I tried it myself :
>
> --- VGA32.S 2024-03-06 14:38:26.928919655 +0100
> +++ VGA25.S 2024-03-06 14:41:35.710411188 +0100
> @@ -8,14 +8,14 @@
> * Monitor: RGB/TV
> * 640*400, 16 Farben, 50.0 Hz (interl.), 15625 Hz
>
> - MOVE.L #$1FE0199,$FFFF8282.W
> - MOVE.L #$50004D,$FFFF8286.W
> - MOVE.L #$FE01B3,$FFFF828A.W
> + MOVE.L #$1900141,$FFFF8282.W
> + MOVE.L #$3E004D,$FFFF8286.W
> + MOVE.L #$16C0156,$FFFF828A.W
> MOVE.L #$2700265,$FFFF82A2.W
> MOVE.L #$2F007E,$FFFF82A6.W
> MOVE.L #$20E026B,$FFFF82AA.W
> MOVE.W #$200,$FFFF820A.W
> - MOVE.W #$182,$FFFF82C0.W
> + MOVE.W #$186,$FFFF82C0.W
> CLR.W $FFFF8266.W
> MOVE.W #$0,$FFFF8266.W
> MOVE.W #$6,$FFFF82C2.W
>
> So, clock bit is changed in ff82c0 (which is what Hatari is using at the
> moment), but it also changes the 6 registers at ff8282 - ff828c that
> define the duration for horizontal lines.
>
> This is sthg that is not supported at the moment, this will require much
> more code (and a better understanding of all these regs for myself :) )
>
> Nicolas
Yes I figured as much, that's why I asked Zerkman to chip in previously :).
He did the Videl Inside software that allows to configure non-standard video modes.
--
Anders Eriksson
ae@xxxxxx