16 Aug
2015
16 Aug
'15
10:15 a.m.
On 8/16/2015 11:19 AM, Chuck Guzis wrote:
On 08/16/2015 08:24 AM, dwight wrote:
More likely, apply the technology used on some 9 Track drives: a little
tension arm and then use servos to drive the supply and takeup reels,
and an encoder (*not* driven) that measures speed (in place of the
capstan on older drives).
I left a note there about using CRCs to do data
correction. It is a
simpler method for software than normally use.
I posted a link on VCF about using GNU CRC RevEng--a great little
utility to aid in determining polynomials and initial conditions for
CRCs. Not too different from figuring oddball floppy encodings.
What I'd like to see is a QIC mechanical solution that treats DC carts
as a reel-to-teel drive--no tension band worries. I imagine this could
be done by motorizing the takeup and supply reels and putting in a
driven capstan with suitable RPM control. Head positioning, of course,
could be handled the normal way. Perhaps an old top-of-the-line audio
cassette transport could be adapted.
--Chuck