Xref: utzoo comp.periphs.scsi:2323 comp.unix.sysv386:6696 Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!snorkelwacker.mit.edu!bloom-beacon!eru!hagbard!sunic!mcsun!hp4nl!hgatenl!mo!hans From: hans@mo.hobby.nl (Hans Oey) Newsgroups: comp.periphs.scsi,comp.unix.sysv386 Subject: Re: CD-ROM w/ISC Message-ID: <1991Apr4.192724.7353@mo.hobby.nl> Date: 4 Apr 91 19:27:24 GMT References: <750@eng3.UUCP> Organization: Makkee & Oey Lines: 31 lumpi@dobag.in-berlin.de (Joern Lubkoll) writes: >joe@eng3.UUCP (Joe LaRocque) writes: >>Do you know of a driver for a CD-ROM (Microsoft format) for ISC 2.+ ? >>Is it possible to access the CD-ROM from Vpix? >>Any assist would be appreciated. >I'm also very interested in hearing about it ! The MSDOS device drivers for my CD-ROM were unusable from VPIX because they use DMA. I wrote a Unix device driver for my Philips CM110 CD-ROM and was able to open it, seek to any sector and read it. As the CD-ROM had the usual High Sierra (ISO-9660?) file system I was able to write some code to copy any CD file into a Unix directory. Then the CD access software from within VPIX was fooled to use that directory: 14 ms access time instead of > 500ms :-) Alas, I can't afford buying 660MB hard disks for each CD. Unix System V, release 3.2, got a file system switch so that you can mount a foreign file system (mount -f dos). Because SVR4 has vnodes, this mechanism won't be used much longer and I don't expect much support. But it must be very easy to add the High Sierra format since it doesn't need any writing. DOES ANYBODY OUT THERE HAS ANY DOCUMENTATION ABOUT THE SVR3 FILE SYSTEM TABLES? -- Hans Oey hans@mo.hobby.nl