Re: NEWSFLASH! Linux ported to Commodore VIC-20!!
Neil Conway (nconway.list@ukaea.org.uk)
Mon, 14 Sep 1998 15:31:21 +0000
Anders Melchiorsen wrote:
>
> Neil Conway <nconway.list@ukaea.org.uk> writes:
> > Hmm, quickndirty calc for 90 minute tape at 64kbits =40megs or so. If
> > you can only get 32kbits then you still get 20megs... The sound
> > engineers among us can no doubt confirm bandwidth and S/N issues, but I
> > would have thought that at least 32kbits would be doable with a little
> > error correction ?
>
> So a 4 hour video tape could carry like 60MB if your data is correct.
>
> > Maybe this isn't such a crap idea after all ;-)) (I still haven't
> > bought a backup device for my new PC).
>
> If your numbers are anywere near correct (others have quoted values of
> 1200 or 2400 bits per second, but these are for the ancient devices
> from 1982 or so) I think I would actually be interested in such a
> driver. I also have no backup device and floppy disks are a nuisance;
> but if I could get just the core of my system backed up rather easily
> (though slowly) I would probably consider doing it.
Hmm, well if you only use the AUDIO input to your video recorder then
yeah, I guess you would get something of the order of 60MB on a 4hr
video tape. However, as you may know, cards already exist to let you
store data on the video portion of a video tape (rough cost is US$50)
and the bandwidth for this is obviously WAY higher (I seem to recall
claims of a couple of gigs per tape but don't quote me).
"Danmere Backer" is one such device whose brandname comes to mind, but
I've never used one.
As for my figures, well they're a guess, but hey, if we can get 33kbps
down a phone line, then I'll bet my ass that a decent tape recorder
can't be far behind (and probably a LOT better).
'Twould probably be a good idea to use something like CIRC error
correcting code as for CDROMs etc. to cope with tape dropouts and such
like.
Neil
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