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- From: hshamans@magnus.acs.ohio-state.edu (Harry T Shamansky)
- Subject: Re: More Exabyte 8500c (and SCSI) questions/woes
- Message-ID: <1992Nov20.015438.28686@magnus.acs.ohio-state.edu>
- Sender: news@magnus.acs.ohio-state.edu
- Nntp-Posting-Host: top.magnus.acs.ohio-state.edu
- Organization: The Ohio State University
- References: <1992Nov19.201853.28678@ncsu.edu>
- Date: Fri, 20 Nov 1992 01:54:38 GMT
- Lines: 36
-
- Hi Michael...
-
- I was the un-named source who exchanged e-mail thoughts with Dave regarding
- the Exabyte 8500c drive. (Dave... jump in if I wander out of my element !)
-
- Your values for major/minor are correct. You might want to modify the
- /etc/MAKEDEV script to automate this process (updates, etc.). It's an easy
- mod. Look to see what `mt status` returns.
-
- The real problem I think you are experiencing is a non-even byte disconnect.
- Unix kernels don't like odd byte disconnects! You need to set even byte
- (four byte boundaries) for disconnect. I should mention that the string
- in the tpsc file
-
- "\40\4\16\0\200\7"
-
- represents the values sent during a mode-select SCSI command (15h), in
- the "Vendor Unique Parameters Page (PF=1 Format)", where the \4 is the
- octal value 4, or the Bit 2 asserted, which is "Disconnect on even byte".
- [See the EXB-8500 8mm Cartridge Tape Subsystem User's Manual, part no.
- 510201-001, and (less interesting) EXB-8500c 8mm Cartridge Tape Subsystem
- User's Manual, part no. 510207-000]. Why this doesn't seem to fix you
- problem, I don't know (Comments.. Dave?).
-
- I do know, however, that you should program your 8500c to have this value
- set by default. Use the Exabyte 8500MON program, a PC, and a simple 4
- conductor cable to the program port on your 8500c (a very worthwhile
- program and cable, and a joy to use [works for 8200, 8500 and 8500c]).
-
- As to the SCSI length question, I'm not sure this problem relates to
- length... maybe, but I doubt it.
-
- Hope that helps....
-
- harry
-
-