Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site spar.UUCP Path: utzoo!utcs!lsuc!pesnta!amdcad!decwrl!spar!maciag From: maciag@spar.UUCP (Chris Maciag) Newsgroups: net.micro.pc Subject: PC/XT Help Needed Message-ID: <72@spar.UUCP> Date: Thu, 7-Feb-85 17:35:44 EST Article-I.D.: spar.72 Posted: Thu Feb 7 17:35:44 1985 Date-Received: Fri, 8-Feb-85 09:54:38 EST Organization: Schlumberger Palo Alto Research, CA Lines: 16 I am currently running MS-DOS and PC/IX (a bad copy of Unix System 3) on an IBM XT. Unfortunately, PC/IX can only be loaded from the active partition. I would like to be able to run a program from MS-DOS that would bring up PC/IX, and vice-versa if possible (either way will be extremely helpful). To do this, I need to: Read sector 0 of the fixed disk (C:) change the 10th byte of the sector to Write the the sector back (with change) Reboot Fixed Disk (not a neccessity) It would be good if this could be done independent of MS-DOS, that way I could use the same routine, with a few changes, to get back to MS-DOS. Any help you can give me will be greatly appreciated. Chris Maciag