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- From: root@hrd769.brooks.af.mil (Super User)
- Newsgroups: comp.unix.bsd
- Subject: Re: [386bsd] Colorado Jumbo tape drive device driver.
- Date: 7 Nov 1992 08:37:51 -0600
- Organization: Armstrong Lab MIS, Brooks AFB TX
- Lines: 38
- Distribution: world
- Message-ID: <1dgkbvINN5vc@hrd769.brooks.af.mil>
- References: <raz.720786927@ultima> <1992Nov5.153537.1@vax.sonoma.edu> <1dchecINN4pk@hpsdlss3.sdd.hp.com>
- NNTP-Posting-Host: hrd769.brooks.af.mil
- Keywords: Colorado, No dice, Tape drive
-
- >|>
- >
- >This was discussed a few months ago, I believe the final answer was
- >that something in Colorado drive I/O was proprietary, and Colorado
- >wouldn't share, so you can't write the driver for them. I could be
- >wrong though, I didn't follow the thread too intently.
- >
- >Regards,
- >Matt
-
- Hello all,
- I was pursueing pretty much the same thread in comp.os.minix about a year
- ago. Does the Jumbo tape drive have a QIC number? If so, the address to
- write to for the complete scoop on the interface is available from
- Freeman Associates in California for FREE! If it does, drop me a line and
- I will scramble around here until I find all of my stuff.
-
- I had the same thought for my QIC-40 floppy tape drive for minix. The
- actual interface was a relative snap (although I never did commit it to
- disk), but the error correction algorithm used is very scary. I had to
- sit at the feet of a mathematician for a solid week before I understood
- the rudiments of finite field mathematics. Reed-Solomon ECC is its name,
- and it is not for the faint of heart!!! The project was pretty much
- undoable for Minix because of the requirement that one track of the tape
- needed to be in memory at a time to ensure complete, verified transfers.
-
- One thing is for sure though, there isn't a company alive that will tell
- you much of anything about the ECC method, mostly because most of the
- tape companies bought it as a black box to plug into their code. The
- authors did a GOOD job, and if anybody wants to plop down the $n^18 for
- it to be included in 386bsd (I don't) we could probably get the same code
- working here.
-
- After All the help I got with the Adaptec Controller question I asked
- last week, I figured this was the least I could do.
-
- TSgt Dave Burgess
- NCOIC AL/MIS
-