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Documentation about the Vampire hardware

Vampire V4 SA OCS, ECS,and AGA Screenmodes ~15kHz?

Benjamin Nice

Posts 9
04 Jun 2020 05:44


Hi,

I was wondering if someone can tell me if Vampire V4 SA OCS, ECS, and AGA screen modes are same scan rate as the original modes i.e. ~15kHz? If this Is the case does it present an issue viewing these on a modern TV? Even though are output via the DIGITAL-VIDEO port?

Thanks,

Ben.


Gunnar von Boehn
(Apollo Team Member)
Posts 6207
04 Jun 2020 08:15


Benjamin Nice wrote:

I was wondering if someone can tell me if Vampire V4 SA OCS, ECS, and AGA screen modes are same scan rate as the original modes i.e. ~15kHz?

The V4SA includes an automatic Scandoubler.
This means the Amiga PAL signal is displayed as HD-PAL which you can see on todays TVs.


Willem Drijver
(Apollo Team Member)
Posts 127
04 Jun 2020 16:50


Hi Gunnar,

Does this mean you could display 640x480 / 256 colors without interlace on a regular DIGITAL-VIDEO display using AGA only (so without load the vampiregfx)?


Benjamin Nice

Posts 9
04 Jun 2020 18:02


Thanks for answering my query Gunnar.


Gunnar von Boehn
(Apollo Team Member)
Posts 6207
04 Jun 2020 18:30


A scandoubler makes the signal showable on modern TV.
A scandoubler will not add delay, and not add any lack.
This means display on the TV can be in real time.
 
A scandoubler will keep the same Herz for the output as input.
This means NTSC is correct 60hz and PAL is correct 50Hz.
No strange artifact like some 50 to 60 change.
 
A scandoubler will not de-interlace.
A scandoubler is maybe the best solution for games and demos.


Willem Drijver
(Apollo Team Member)
Posts 127
05 Jun 2020 17:54


Hi Gunnar, Are there any thoughts or developments on delivering non-interlaced AGA Hi-RES 640x480?

 


Olivier Landemarre

Posts 147
05 Jun 2020 20:13


Willem Drijver wrote:

Hi Gunnar, Are there any thoughts or developments on delivering non-interlaced AGA Hi-RES 640x480?
 
 

SAGA support without problem 640*480 non interlaced formats from 1 bit to 32 bits color depth



Philippe Flype
(Apollo Team Member)
Posts 299
06 Jun 2020 01:04


@Olivier That's true for RTG (the non planar modes) . On legacy planar LACE modes we'd still need flickerfixer.


Olivier Landemarre

Posts 147
06 Jun 2020 08:22


Philippe Flype wrote:

@Olivier That's true for RTG (the non planar modes) . On legacy planar LACE modes we'd still need flickerfixer.

Yes 1 plan flick a lot and is not really usable

Other work not too bad, some flick sometime to time in 2 plane and 4 plane at low resolution but work nice if resolution is higher.

Other mode as I can see work nicely.

I think it will be fixed soon ;-)

I have a question regarding one parameter of SAGA: SAGA_VIDEO_htotal

looks like if follow UMC generally not work on my monitor and should reduce the value to have something working, is link to my old core or is something known and that will stay like this ? I said this because I just put a patch in Emutos to support Saga and of course value are fixed in rom, we can't change value to fix a change in core.

Thanks

Olivier


posts 9