TT Hi res in colour?

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mrbombermillzy
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TT Hi res in colour?

Postby mrbombermillzy » Sun Aug 20, 2017 8:53 am

I see elsewhere on this forum, Codekiller is selling ECL to VGA adapters for the TT.

A while ago, a few of us on the C128 forums were discussing the possibility of improving the low/weird colour output of the RGBI video output.

One possibility that was discussed was the use of a CLUT/RAMDAC system.
Has someone ever tried this for the TT with a ECL to VGA adapter?

An 8-bit CLUT would be fairly doable or perhaps a 12-bit if you want the full TT colour range to be covered.

Im surprised, no one has tried this before or at least not discussed it. :shrug:

I can only suppose that VME GFX cards are probably a more straightforward upgrade.

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Cyprian
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Re: TT Hi res in colour?

Postby Cyprian » Sun Aug 20, 2017 9:51 am

mrbombermillzy wrote:Has someone ever tried this for the TT with a ECL to VGA adapter?

what do you mean? TT hardware modification or an interface between unmodified TT and VGA?
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mrbombermillzy
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Re: TT Hi res in colour?

Postby mrbombermillzy » Sun Aug 20, 2017 9:58 am

Well, there seems to have been another ECL>VGA adapter made for the TT (the tenox). I was just wondering if someone with one of these (or equivalent) had tried to 'inject' colour information into the signal by adding a RAMDAC colour board.

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frank.lukas
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Re: TT Hi res in colour?

Postby frank.lukas » Sun Aug 20, 2017 10:16 am

You mean something like a ODIN Graphic Adapter -> http://www.maedicke.de/atari/galerie/di ... ngraka.htm

Image

A RamDAC is not enough and it is slow ...
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mrbombermillzy
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Re: TT Hi res in colour?

Postby mrbombermillzy » Sun Aug 20, 2017 10:32 am

Yes, similar. The C128 had lower dotclock (~16Mhz) so I cant see a problem speed wise, but could not a more modern (i.e. faster speed) implementation be made in a modern PLD device fairly simply for the higher (~70Khz) scan rate?

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Re: TT Hi res in colour?

Postby mfro » Sun Aug 20, 2017 2:45 pm

As there is no way to increase the bandwidth, that would mean you had to send 8 TT High mono frames to get one 1280x960 256 colour frame.

You'd end up with something like 7 Hz frame rate. Sure you'd want that?

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Re: TT Hi res in colour?

Postby mrbombermillzy » Sun Aug 20, 2017 9:32 pm

Actually, what I was thinking about doing was perhaps a little too complex. A VME>ISA bridge with a PC GFX card would be alot less hassle! :mrgreen:


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