QIC-24 data analysis

Jay Jaeger cube1 at charter.net
Sun Aug 16 12:15:16 CDT 2015

On 8/16/2015 11:19 AM, Chuck Guzis wrote:
> On 08/16/2015 08:24 AM, dwight wrote:
>> 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

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).

More information about the cctech mailing list