Xref: utzoo comp.sys.mac:9940 rec.video:2351 sci.electronics:1723
Path: utzoo!mnetor!uunet!husc6!uwvax!oddjob!gargoyle!ihnp4!homxb!mtuxo!mtune!mtunk!io!granjon!edsel!arrow!pierce!cbdkc1!czei
From: czei@cbdkc1.UUCP
Newsgroups: comp.sys.mac,rec.video,sci.electronics
Subject: Re: Hard disk back-up on a VCR ?
Message-ID: <2613@cbdkc1.ATT.COM>
Date: 14 Dec 87 13:19:42 GMT
References: <9823@shemp.UCLA.EDU>
Reply-To: czei@cbdkc1.UUCP (Michael S. Czeiszperger CB 1L334 x4952 ADMIN)
Organization: AT&T Bell Laboratories, Columbus
Lines: 24

In article <9823@shemp.UCLA.EDU> khayo@MATH.UCLA.EDU (Erazm J. Behr) writes:
>There is apparently
>a product (add-on board, software, cables etc.) that
>lets you back up a hard disk on a VCR (VHS) cassette.

At OSU, I've helped design some hardware which could be used to accomplish
such a thing using Sony's PCM adapters.  Unfortunately, the adapters
expect constant data at a throughput around that of a CD, which is too fast
for hard disks connected to the Mac with no DMA. Since we are just using
the Mac for development, this wasn't a problem for us, but it ruins
the chances for easily making it work for backup.  A solution I've
considered is a kind of Stop/Start protocol which would 'imbed' the
Mac data into the faster digital stream going onto videotape at a
constant rate.  



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Michael S. Czeiszperger     | "HELP!  I'm stuck in 3B HELL !!!"
Contracted to AT&T          | Phone: (614) 860-4952
Unix Systems Administration | UUCP: cbosgd!dkc1!czei
6200 E. Broad Street        | Disclaimer: "The above opinions are those
Columbus, OH   RM 1L334     |   of a large rodent with sharp teeth"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~