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Conference hydra::amiga_v1

Title:	AMIGA NOTES
Notice:	Join us in the NEW conference - HYDRA::AMIGA_V2
Moderator:	HYDRA::MOORE

Created:	Sat Apr 26 1986
Last Modified:	Wed Feb 05 1992
Last Successful Update:	Fri Jun 06 1997
Number of topics:	5378
Total number of notes:	38326

875.0. "De-interlacer rumors..." by LEDS::ACCIARDI () Thu Nov 05 1987 11:12

    A fellow on PLINK has seen a de-interlacer board for all three Amiga
    models.  This is not a cheap add-on; the model for the A2000 is
    around $600, the A500 and A1000 models will be priced around $400.
    
    The A2000 de-interlacer will work on all modes, including HAM. 
    The lower cost version will only work on 640 x 400 x 16 colors and
    320 x 400 x 32 colors.  HAM mode flicker usually isn't noticable,
    since the smooth blending of colors eliminates sharp contrast between
    adjacent scan lines.
    
    There is a catch though; all models will require the use of a multiscan
    type monitor, such as the Sony 1302 or the NEC MultiSync.  With
    the added monitor cost, non-interlaced hi-res will cost you around
    a thousand bucks... uggghh!!
    
    I'll post any more info I can gather in this note.  
    
    Anyone hear any more on Commodore's long persistance monitor?

T.R	Title	User	Personal Name	Date	Lines
875.1	Overscan any problem?	MEMORY::BERKSON	What's that in the road - a head?	`Thu Nov 05 1987 12:36`	4
	More info if you can get it: Will the de-interlacer have any problem in overscan mode? mitch
875.2		LEDS::ACCIARDI		`Thu Nov 05 1987 14:37`	13
	re: overscan support... I'm not sure if it supports it or not, but I'll try to find out. I am puzzled though; I'd assume you'd want full overscan for recording a full screen to a VCR. In this case, you'd want to use interlace to be compatible with NTSC. Actually, I don't think it's possible to change the display parameters on a single scan line, other than color. In other words, you can't go from hi res to lo res or change interlace on a single line. Ed.
875.3		MEMORY::BERKSON	What's that in the road - a head?	`Thu Nov 05 1987 16:02`	9
	I may be far afield on this. Aren't there some programs - especially games that use overscan? It seems like it would be a major pain for the card to support it since if it supported up to 640x400, the frame fits within 256K. But if it supports overscan it would need a significant amount more hardware. mitch
875.4	Dynamic Resolution Switching	TLE::RMEYERS	Randy Meyers	`Mon Nov 09 1987 06:06`	15
	Re: .2 > Actually, I don't think it's possible to change the display parameters > on a single scan line, other than color. In other words, you can't > go from hi res to lo res or change interlace on a single line. Sure you can. The Copper can change the horizontal and vertical resolution on every scan line. Haven't you ever pulled down a Deluxe Paint low res screen to see the medium res workbench screen underneath? For that to work, the Copper has to support switching from 640 wide to 320 wide res on the fly. It is true that putting any interlace screen on the physical display will cause the entire physical display to go into interlace. But, even in this mode the copper is displaying non-interlace screens in their normal 200 line high resolution by displaying each non-interlaced scan line twice.
875.5	...	LEDS::ACCIARDI		`Mon Nov 09 1987 08:26`	20
	Sure, I knew that... what I meant was that a given screen may have only one resolution at a time. You couldn't have a screen with a hi-res window right next to a lo-res window on the same screen. In answer to the original question, I've seen a brochure at the Software Shop for the de-interlacer. It claims a resolution of 670 x 444 or something like that, which I believe are the overscan dimensions. While at the Software Shop, Moe gave me a quick dump on Comdex, which he visited. He saw an A2000 running Professional Page on a large mono monitor with the de-interlacer installed. He claimed the display was incredible, as good as any of the Mac large displays. These new toys are a good thing, but clearly out of the price range of the average home user. Maybe some clever hacker will come out with a lower priced de-interlacer for us poor A1000 owners... Ed.