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PICList Thread
'Videobackup'
1998\01\29@122317 by Adil Temel

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Is anyone interested in backing up data to a standard videorecorder
using a PC parallel port and a special designed interface with PIC16c84
?


+========================================================+
+Dr. Adil Temel               E-Mail: spam_OUTatemelTakeThisOuTspamhotmail.com +
+========================================================+


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1998\01\29@123106 by Mark Birks

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Always interested in new and innovative uses of the PIC !

> -----Original Message-----
> From: Adil Temel [SMTP:.....atemelKILLspamspam@spam@HOTMAIL.COM]
> Sent: Thursday, January 29, 1998 5:10 PM
> To:   PICLISTspamKILLspamMITVMA.MIT.EDU
> Subject:      Videobackup
>
> Is anyone interested in backing up data to a standard videorecorder
> using a PC parallel port and a special designed interface with
> PIC16c84
> ?
>

1998\01\29@130254 by John Payson

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> Is anyone interested in backing up data to a standard videorecorder
> using a PC parallel port and a special designed interface with PIC16c84

Such a concept would have been useful a few years ago.  Nowadays, however,
reasonably-priced tape drives can back up data faster and more reliably
than a consumer-grade VCR.  While there may be some merit in the low media
cost, VCR backup solutions are a pain in the tusch to use.  If you want to
make the thing work at all reasonably, you'll need to have a fair amount
of RAM on your encoder/decoder board for buffering [e.g. 1MB] and have it
incorporate enough intelligence to read/write large amounts of data unatt-
ended.  Then you'll have to have the data on type subdivided into some size
blocks, with some blank space between blocks to allow the VCR to be paused
if needed.

Basically, what you'll need to do is have the device be able to read data
off the tape into the buffer while spooling the data to the PC, and have it
be able to pause the tape at a block boundary if the PC isn't processing the
data fast enough.  If your net data rate is 1mpbs and your block size is
128K (about a second), then you can have the device stop the tape when all
eight blocks of buffering are full and restart the tape when seven are
empty.  With any luck, you should be able to manage a nice consistent flow
of data without too much starting/stopping of the drive.

1998\01\29@131939 by John A. Craft

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At 09:09 AM 1/29/98 -0800, you wrote:
>Is anyone interested in backing up data to a standard videorecorder
>using a PC parallel port and a special designed interface with PIC16c84

There was a company called videotrax that had and went out of business selling the units which backed up at 1.5MB per minute.  Now in '86, that was good. 

But it would be an interesting project.

Jc.

John A. Craft (228)689-8103 Voice
Sr. Systems Analyst / Vice President (228)689-8130 Fax
Nation Computer Services, Inc. http://www.ncs-ssc.com
MSAAP Bldg 9110 craft@ncs-ssc.com
Stennis Space Center, MS  39529

1998\01\29@135850 by peter

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Adil Temel wrote:
>
> Is anyone interested in backing up data to a standard videorecorder
> using a PC parallel port and a special designed interface with PIC16c84

I bought a system two years ago called Backer from Danmere in the UK
It is supposed to backup at up to 9 meg a minute max
I've only managed 6 meg per minute with no problems
I think thats much better than most backup systems

It doesn't use a PIC. It has one custom 68pin chip DAN0428A
four chip transistors, 19 resistors, 11 caps and 4 jumpers

I don't use it much even though I have two videorec's.
It does not like long leads and it needs the tv also connected
or videoblaster in the computer  (had to take it out,
not enough slots)

Its a lot of work to connect it all up
and, the lack of slots......

I have networked my three home pc's
and make backups one to the other.
Since DOS 3.1 I've had more than one hard drive
and backed important stuff to the other drive

As big hard drives are so cheap now
I do not think there will be any comercial interest

Peter

.....peterKILLspamspam.....cousens.her.forthnet.gr

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