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Xref: sserve comp.os.linux.development:8706 comp.os.minix:23649 comp.os.mach:3763 comp.os.386bsd.development:2058 comp.sys.ibm.pc.hardware.misc:5022 Newsgroups: comp.os.linux.development,comp.os.minix,comp.os.mach,comp.os.386bsd.development,comp.sys.ibm.pc.hardware.misc Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msuinfo!uwm.edu!cs.utexas.edu!howland.reston.ans.net!pipex!sunic!EU.net!sun4nl!rnzll3!pe1chl!rob From: rob@pe1chl.ampr.org (Rob Janssen) Subject: Re: Booting from CD-ROM, was: [Announcement] 386BSD Release 1.0 References: <2q63q2$927@dearg.cuillin.org.uk> <wright.86.000DC700@lims01.lerc.nasa.gov> <2q8qqr$q96@spool.cs.wisc.edu> <hastyCpCLny.5q8@netcom.com> <newcombe.142.00141E4A@aa.csc.peachnet.edu> <CpE8p7.H@wg.saar.de> <1994May7.211614.28288@ibr.cs.tu-bs.de> Organization: PE1CHL Date: Sun, 8 May 1994 19:21:22 GMT Message-ID: <1994May8.192122.5828@pe1chl.ampr.org> Reply-To: pe1chl@rabo.nl Lines: 22 In <1994May7.211614.28288@ibr.cs.tu-bs.de> rh@ramz.ing.tu-bs.de (Ruediger Helsch) writes: >It is possible to boot from a CD-ROM. I made a CD with a boot block so >it could be bootet from a SCSI CD-ROM hanging on an AHA1542B. But >I do not know how many other SCSI adapters or CD-ROM controllers do >allow this, I think even with the AHA1542C it would not work, its BIOS >does simply refuse to boot a CD-ROM. But what did you do to avoid the system booting from a harddisk? I can understand (as I explained in another posting) that it is possible to boot from a CD-ROM, at least as long as the BIOS does not explicitly disallow it. The bootcode just reads block 0 and performs some checks on validity as a bootblock. What I don't understand is how you can boot a CD-ROM which is at unit #1 (for example) while unit #0 is a harddisk. Rob -- ------------------------------------------------------------------------- | Rob Janssen | AMPRnet: rob@pe1chl.ampr.org | | e-mail: pe1chl@rabo.nl | AX.25 BBS: PE1CHL@PI8UTR.#UTR.NLD.EU | -------------------------------------------------------------------------