WTB: Flicker Fixer

[alexh]

External ones suck compared to the best internal ones.

They have to re-digitise the analog signal.

Digital->Analog->Digital->Analog

You can imagine what that does to the quality.

[alexh]

It's very easy to make your own 16-bit scandoubler if you REALLY want to.

You need two chips both by Averlogic.

One is a triple 10-bit ADC, the other is the AL250 scandoubler.

A guy called Roy sells ready made ones under the name "CoCo VGA" (because they were originally made for a Tandy CoCo).

http://www.miba51.com/CoCo_VGA_Adpater.html

Bummer is they are only 16-bit, but then so are a lot of Amiga ones.

At $65 delivered they are ok.

[alexh]

16-bit means that you loose some colour resolution in AGA screen modes (which are 24-bit).

Not a problem if you have an OCS/ECS Amiga, but not brilliant if you have an AGA Amiga.

[alexh]

vic20owner wrote:
Anyone actually TRIED this scan doubler with an amiga?

Which video modes does it display correctly?

What about interlace?

I dont think Roy has ever tried it with an Amiga. He recently used it with an Atari ST.

The chips work with all standard TV compatible modes. It is a deinterlacer so of course handles interlaced modes.

Probably doesnt work with Productivity mode etc.

[alexh]

Roy's CoCo VGA contains the Averlogic chips.

The issue is not the ADC (that is effectively 30-bit) but it is the RGB input to the scandoubler which is only 16-bit (5:6:5)

And also, sadly, AmigaKit is right about *why* SD/FFs aren't been made. Jens Schoenfeld gave us the exact same reasons for the lack of SD/FF hardware.

Price is the killer, you HAVE to use off the shelf components to keep the price down. If you are above the $65 (£35) is the "wife acceptable" price point. Anything above that and you have to almost DOUBLE the sale price as you will only sell half as many.

MiniMig has a built in Scandoubler, as does Clone-A so a separate scandoubler project is mute at this point.

[alexh]

vic20owner wrote:
Also, minimig is basically a 14mhz A500, is it not?

No it's not, it's a 7MHz OCS A1000/A2000/A500! (for the timebeing.)