From: utzoo!decvax!genradbo!linus!smk
Newsgroups: net.unix-wizards,net.bugs.4bsd
Title: problems with our TU77 on 4.1bsd
Article-I.D.: linus.300
Posted: Wed Dec  8 18:55:49 1982
Received: Fri Dec 10 02:58:42 1982

	Since we've been up (for over a year), we've suffered
tape problems with our TU77.  Now that we have 3 machines
(2 780's, 1 750) running 4.1bsd, all of them have problems with reading
in tapes at 1600 bpi.  VMS doesn't have problems with 1600 bpi, but
we really can't run VMS.  So, I guess it's the TU77 driver (or
mysteriously, all 3 drives have the same hardware problem).  At
least for 2 machines, we've had DEC come and allign, check out,
and readjust the drives to no avail.  It must be a ht.c problem.

	Does anyone using 4.1 and TU77s have this problem?  I'd
like to hear from you if you have TU77s even if you don't have a problem
so we can at least compare the drivers.

	We also have problems in reading in any kind of block tape.
We always have to use the raw device.

These are some of the types of hard errors we get when trying to read
1600 bpi tapes (note the first one -- reports correctable error,
but it's still a hard error):
tu0: hard error bn7 mbsr=13080<ATTN,DTCMP,DTABT,MBEXC> er=100000<CORCRC> ds=50620<ERR,MOL,DPR,DRY,SDWN>
tu0: hard error bn0 mbsr=13080<ATTN,DTCMP,DTABT,MBEXC> er=2300<CSITM,PEFLRC,INCVPE> ds=54660<ERR,MOL,WRL,DPR,DRY,PES,SDWN>
tu0: hard error bn16619 mbsr=13080<ATTN,DTCMP,DTABT,MBEXC> er=20000<OPI> ds=54600<ERR,MOL,WRL,DPR,DRY>
tu0: hard error bn0 mbsr=13100<ATTN,DTCMP,DTABT,MXF> er=40000<UNS> ds=50703<ERR,MOL,DPR,DRY,SSC,BOT,SLA>
tu0: hard error bn5560 mbsr=13080<ATTN,DTCMP,DTABT,MBEXC> er=100200<CORCRC,PEFLRC> ds=50660<ERR,MOL,DPR,DRY,PES,SDWN>
tu0: hard error bn0 mbsr=13100<ATTN,DTCMP,DTABT,MXF> er=40000<UNS> ds=54703<ERR,MOL,WRL,DPR,DRY,SSC,BOT,SLA>
tu0: hard error bn0 mbsr=13080<ATTN,DTCMP,DTABT,MBEXC> er=1000<FCE> ds=54720<ERR,MOL,WRL,DPR,DRY,SSC,SDWN>

Can anyone help me diagnose this or at least provide meanings to some
of the errors?

	Thanx VERY much
	--steve