SuperVidel RGB output

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calimero
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SuperVidel RGB output

Postby calimero » Tue Oct 29, 2013 11:46 am

Hi,

I have F030 + CT63 + SuperVidel.
I have two monitors:
1. Commodore 1084s connected to F030 video port with custom made composite cable
2. Dell U2412M connected to SuperVidel via VGA cable

normally, I do not get picture on Dell while I use RGB modes on Commodore 1084s in GEM...

but yesterday I watch newer F030 demos on Commodore 1084s (derealization/DHS, silkcut/TBL, ocean machine/TBL) I run them from MiNT *without* SYS drivers for MiNT/NVDI or SuperVidel auto folder PRG and I get picture of demo on Dell monitor (beside expected picture on Commodore 1084s)!

here you can see it:

photo 1.JPG


Dell report this resolution:

photo 2.JPG


how this is possible?

does SuperVidel support RGB modes?
or these demos use particular screenbuffers and resolution that SuperVidel can show somehow...? :)

NOTICE: my Dell U2412M can show SOME of 15KHz resolution: http://www.youtube.com/watch?v=Vloo7nwL56U
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using Atari since 1986.http://wet.atari.orghttp://milan.kovac.cc/atari/software/ ・ Atari Falcon030/CT63/SV ・ Atari STe ・ Atari Mega4/MegaFile30/SM124 ・ Amiga 1200/PPC ・ Amiga 500 ・ C64 ・ ZX Spectrum ・ RPi ・ MagiC! ・ MiNT 1.18 ・ OS X

evil
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Re: SuperVidel RGB output

Postby evil » Fri Nov 01, 2013 5:39 pm

calimero wrote:I have F030 + CT63 + SuperVidel.
I have two monitors:
1. Commodore 1084s connected to F030 video port with custom made composite cable
2. Dell U2412M connected to SuperVidel via VGA cable

normally, I do not get picture on Dell while I use RGB modes on Commodore 1084s in GEM...


Hi!

First I have to say, nice choice of demo!

Ahem, and to the topic: Our demos most often use the 25 MHz pixel clock of the Videl, that's usually used to drive VGA resolutions rahter than RGB, and probably the reason why it works on SuperVidel. The reason we use 25 MHz instead of 32 MHz pixel clock on RGB screens are that

1. It's accelerator independent, bus accelerators will not affect refresh rate like it would on the 32 MHz clock and
2. It gives free overscan without more pixels :)


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