Re: Did Commodore cheat with the quad density floppies?

From: silverdr_at_wfmh.org.pl
Date: Mon, 14 Jan 2019 09:21:56 +0100
Message-Id: <1127DDD7-E2B6-43CD-BF97-33B67536BBDD@wfmh.org.pl>
> On 2019-01-13, at 12:10, Gerrit Heitsch <gerrit@laosinh.s.bawue.de> wrote:
> 
>>> The thing about Video2000 was that it had better image quality. No dropouts and no distortions when fast forwarding.
>> 
>> Bandwidth was similar if not the same (don't recall exactly now) but using half the tape width, dropouts are always there (medium dependent) but it didn't need any (manual) "tracking" (similar to head azimuth in C2N :-) due to advanced "DTF" solution. Therefore the inaccuracies were dynamically compensated, giving therefore better overall output. It also allowed distortion-free stills, slow-motion, fast-motion (both ways), fast winding both ways (_much_ faster than others), immediate recognition of the position of the tape with great accuracy - you could insert any tape in any position (no need to rewind), enter desired time from start, press "go to" and you landed where you wanted.
> 
> They managed to do this with VHS too, but much later.

I /think/ the first to do this was Grundig, once they dropped the towel and started to build VHS stuff. They surely had enough know-how from the V2000 development that could be put into use there. But the average time needed to reach arbitrary location was still much longer than with V2000.

> And for the distortion free stills and forward/back, you needed 4 heads on VHS.

The only _fully_ distortion-free stills I saw on VHS, was with machines having framebuffer built-in (had some of those for studio work). The others tried to move the distortions to the bottom/vblank portion of the frame, out of the normally visible area. And for fast forward/back I don't recall any that would be completely distortion-free, in the sense V2000 was. AFAIR with advanced 4 heads machines the distortions were an order of magnitude less pronounced but still visible.

> 
> Gerrit

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Received on 2019-01-14 10:00:08

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