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Amiga computer related discussion => General chat about Amiga topics => Topic started by: Ral-Clan on January 08, 2011, 04:31:46 PM

Title: What is the difference between a FlickerFixer and a Scandoubler?
Post by: Ral-Clan on January 08, 2011, 04:31:46 PM
Never understood the difference between this one....Flickerfixer vs. Scandoubler?

I've have an Amiga 3000 and a 2000 with the standard Commodore FlickerFixer/Scandoubler card installed in the video slot.....

Aren't a FlickerFixer and a Scandoubler the same thing?
Title: Re: What is the difference between a FlickerFixer and a Scandoubler?
Post by: koshman on January 08, 2011, 04:45:15 PM
Scandoubler doubles the horizontal refresh rate of 15Khz screenmodes, flickerfixer fixes the flickering on interlaced screenmodes. Both functions can be integrated into one device, like yours, or you can have a separate scandoubler (like my Scandy A1200) or even a separate flickerfixer IIRC.
Title: Re: What is the difference between a FlickerFixer and a Scandoubler?
Post by: ElPolloDiabl on January 08, 2011, 05:05:28 PM
This question has been asked before.

http://www.amiga.org/forums/showthread.php?t=33478&highlight=Scandoubler+difference (http://www.amiga.org/forums/showthread.php?t=33478&highlight=Scandoubler+difference)

Do a quick search before posting your question. It's a bit silly when the same questions keep popping up.
Title: Re: What is the difference between a FlickerFixer and a Scandoubler?
Post by: Ral-Clan on January 08, 2011, 06:50:47 PM
Quote from: ElPolloDiabl;604870
This question has been asked before.

http://www.amiga.org/forums/showthread.php?t=33478&highlight=Scandoubler+difference (http://www.amiga.org/forums/showthread.php?t=33478&highlight=Scandoubler+difference)

Do a quick search before posting your question. It's a bit silly when the same questions keep popping up.

Oh, Thanks.  From the link above I can see that question was asked before in 2007, and before that in 2004

(http://www.amiga.org/forums/showthread.php?t=10681&highlight=scandoubler+flickerfixer+difference)

...I will definitely do a search before I ask such a question again.  My apologies.
Title: Re: What is the difference between a FlickerFixer and a Scandoubler?
Post by: Zac67 on January 08, 2011, 07:57:24 PM
From the technical POV a scandoubler stores a single scan line and doubles the horizontal scan rate by outputing the line twice - this doesn't necessarily work with interlaced modes.

In contrast, a flicker fixer stores an entire video field (half of an interlaced frame) and alternately outputs a line from the previous field and one of the current. This nicely converts interlaced screens to progressive but produces ghost artifacts for moving objects (since half of the frame is 20 ms older than the rest).