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From: hedley@cbmvax.UUCP (Hedley Davis)
Newsgroups: comp.sys.amiga
Subject: Re: Monitor mishmash
Message-ID: <2530@cbmvax.UUCP>
Date: Sat, 17-Oct-87 04:55:00 EDT
Article-I.D.: cbmvax.2530
Posted: Sat Oct 17 04:55:00 1987
Date-Received: Sun, 18-Oct-87 12:07:35 EDT
References: <3113@ccicpg.UUCP>
Reply-To: hedley@cbmvax.UUCP (Hedley Davis)
Organization: Commodore Technology, West Chester, PA
Lines: 34
Keywords: Interlace, monitors, scan doublers

Scan doubler:
	A device which converts video by repeating each displayed line
	twice ( at twice the speed ). This acts to enhance the displayed
        image by "filling in the gaps between the scanned lines". Gives
	a nice solid appearence, but DOES NOT add resolution. Requires
	one display lines worth of memory. Really very cheap ( not
	counting the monitor ).

Scan Converter:
	A device which converts video from one format to another.
	Typically used for deinterlacing picures. Output video rate
	is twice that of a normal display. Doubles vertical
	resolution. Requires at least one feilds worth of ram.
	Not so cheap ( due to memory cost ).

I cannot speak for us ( this IS ironic ), but I know that certain
third parties are pursuing the scan conversion problem for the Amiga
market. Such devices are planned for the A2000, and possibly the 
A500/A1000 as well. I have seen prototypes, and they basically
give you a non-interlaced 640x400 display. For the A500/A1000 units,
vendors will probably choose to do a 4 bit/16 color conversion using
the digital RGBI outputs on the video connector. ( High speed ADCs
are expensive, and the analogue stuff would be tricky indeed, as
opposed to a 90% digital solution ). For the B2000 units, the 
internal video slot has all twelve bits of digital video avilable,
so the full color solution remains largely digital ( easy ).

The nice thing about scan converters is that they are typically
100% software compatible ( as the software could not tell if
they were there if their lives depended on it ).

Such devices are highly reccomended.

Hedley