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Newsgroups: comp.unix.bsd.freebsd.misc Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!nntp.coast.net!zombie.ncsc.mil!news.mathworks.com!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!news.physics.uiowa.edu!ljg From: ljg@space.physics.uiowa.edu (Larry Granroth) Subject: CDROM changers, etc X-Nntp-Posting-Host: ljgpc.physics.uiowa.edu Message-ID: <DMHsAG.IyE@sysadm.physics.uiowa.edu> Sender: news@sysadm.physics.uiowa.edu (News Administrator) Organization: The University of Iowa, Department of Physics and Astronomy X-Newsreader: TIN [version 1.2 PL2] Date: Fri, 9 Feb 1996 04:54:15 GMT Lines: 22 Greetings- First off, I'm looking for information on using the /dev/ch0 device for controlling a Pioneer DRM-1804X CDROM changer. I've found ioctl structures in <sys/chio.h>, but was hoping that someone had already put together some convenient utilities. I also have some changers with few enough slots to access them each as a SCSI lun. I'd like to hang a bunch of these on a system, but /dev/MAKEDEV is hardcoded to only allow cd0 through cd6. (The same thing is true for the ch devices.) Is it safe to extend these, or do the arguments to mknod go out-of-bounds? (I'm ignorant of these things.) If so, can I add additional SCSI controllers and keep adding devices? (I'm trying to implement an economical and modular alternative to a large CDROM jukebox.) Thanks in advance for any pointers. I'll submit a summary if appropriate. -Larry larry-granroth@uiowa.edu