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Old 01-29-2010, 10:18 PM   #1
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Default >256 colors with Indivision for A1200?
I have the Indivision for my A1200 and I don't see any options for more than 256 colors... I only want more than 256 colors for paint and image applications, not Workbench.... I have a accelerated A1200, with Apollo 1240 and 32 meg RAM.

How do I get screen modes with more than 256 colors?
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Old 01-29-2010, 11:18 PM   #2
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Default Re: >256 colors with Indivision for A1200?
Displayable colors is the same as before with Indivision, it just affects the scanrate.
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Old 01-30-2010, 03:59 AM   #3
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Default Re: >256 colors with Indivision for A1200?
You'll probably need to make sure the application you're using supports AGA.
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Old 01-30-2010, 03:59 AM   #4
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Default Re: >256 colors with Indivision for A1200?
Wasn't there some old hack that allowed you to use HAM modes for Workbench?
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Old 01-30-2010, 04:44 AM   #5
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Default Re: >256 colors with Indivision for A1200?
Quote:
>256 colors with Indivision for A1200?

Select a HAM8 gfx mode in your paint program.
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Old 01-30-2010, 05:05 AM   #6
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Default Re: >256 colors with Indivision for A1200?
http://www.vesalia.de/e_indivisionaga1200.htm

Apparently it's supposed to be supported.
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Old 01-30-2010, 05:12 AM   #7
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Default Re: >256 colors with Indivision for A1200?
Quote:
Originally Posted by Hell Labs View Post
http://www.vesalia.de/e_indivisionaga1200.htm

Apparently it's supposed to be supported.
"24 Bit colour resolution in all screenmodes" doesn't mean that it supports 24bit modes. It means it supports 8bits per gun (R, G and B).

Misleading? Perhaps.

The only way to get more than 256 colours with this setup is to use HAM6 or HAM8 screenmodes.
Last edited by Piru; 01-30-2010 at 05:14 AM..
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Old 01-30-2010, 05:29 AM   #8
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Default Re: >256 colors with Indivision for A1200?
On a similar note, I've always wondered if it wouldn't be able to do chunky->planar conversion. Like a graffiti compatible device.
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Old 01-30-2010, 05:31 AM   #9
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Default Re: >256 colors with Indivision for A1200?
Quote:
Originally Posted by ChaosLord View Post
Select a HAM8 gfx mode in your paint program.
[/B]
Like this chap :-)
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Old 01-30-2010, 05:37 AM   #10
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Default Re: >256 colors with Indivision for A1200?
What would be the speed with 060/50Mhz and Workbench in 256 colors via Indivision Aga? I was trying to find some movies on YT but there is non with that config..
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Old 01-30-2010, 05:44 AM   #11
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Default Re: >256 colors with Indivision for A1200?
Sluggish, but not entirely unusable if all those colors really were required.

32 color was always the most usable one for me.
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Old 01-30-2010, 05:53 AM   #12
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Default Re: >256 colors with Indivision for A1200?
Quote:
Originally Posted by Linde View Post
On a similar note, I've always wondered if it wouldn't be able to do chunky->planar conversion. Like a graffiti compatible device.
When I first got my BlizzardPPC and before I got an RTG card, I was struck with an idea that has always left me a bit curious since. In the day, I used to use Shapeshifter and there was a PPC enabled external video driver called SavagePPC (Demo version here), which as the name implies, used the PPC to handle C2P conversion and, in the full version, supported 15-bit modes on AGA using a HAM based C2P routine.

Now, phase5 shipped an AGA driver with CyberGraphX. It allowed applications that relied on CGX calls to work on AGA screenmodes, provided they would work with 256 colour modes. However, it wasn't really much of a display driver, but it did show that you could use the native display as a CGX back end, albeit only in 8-bit modes.

My idea, although I've never seriously made a feasibility study of it, was to design an RTG driver that used Fast RAM for chunky bitmaps in 8/16/24/32 bit depths and passing that back as the BitMap whenever a CGX compatible one is asked for. So, when opening, say, a 16-bit screen, what you'd actually get was an 8-bit screen opened and a 16-bit chunky buffer in fast ram. Using a blanking interrupt, the PPC would kick in and do any required RGB->HAM conversion and C2P on the areas of the screen that appear to have changed in a manner similar to the SavagePPC EVD. If it could be made to work, then you could also implement basic blitter routines (block move, fill, scale etc) that would also use the PPC when processing areas of the chunky buffer large enough to mask the context-switch time (and simply doing it on the 68K when the areas are too small to be worth it).

The idea pretty much died when I got a graphics card, though I still wonder about it from time to time, especially with the IndivisionAGA HighGFX stuff. The notion of a 15 bit RTG display running at 1024x768 on AGA makes me smile.
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Old 01-30-2010, 06:29 AM   #13
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Default Re: >256 colors with Indivision for A1200?
Quote:
Originally Posted by pampers View Post
What would be the speed with 060/50Mhz and Workbench in 256 colors via Indivision Aga?
exactly the same speed as same setup without Indivision AGA.
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Old 01-30-2010, 06:55 AM   #14
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Default Re: >256 colors with Indivision for A1200?
Quote:
Originally Posted by Hell Labs View Post
http://www.vesalia.de/e_indivisionaga1200.htm

Apparently it's supposed to be supported.
Just to add a bit to what Piru said, what that essentially means is that HAM modes are properly scandoubled. Scandoublers that don't support 24 bits produce washed out or dithered colors in HAM or other high-color modes.
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Old 01-30-2010, 07:08 AM   #15
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Default Re: >256 colors with Indivision for A1200?
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Originally Posted by Karlos View Post
The notion of a 15 bit RTG display running at 1024x768 on AGA makes me smile.
It wouldn't be that high resolution.
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