Xref: utzoo comp.sys.ibm.pc:29057 alt.msdos.programmer:58 Path: utzoo!attcan!uunet!ateng!chip From: chip@ateng.ateng.com (Chip Salzenberg) Newsgroups: comp.sys.ibm.pc,alt.msdos.programmer Subject: Re: MS-DOS Redirectors: How do they work? Message-ID: <1989May19.143340.27207@ateng.ateng.com> Date: 19 May 89 18:33:40 GMT References: <1989May17.191901.16666@ateng.ateng.com> <1916@iesd.dk> Organization: A T Engineering, Tampa, FL Lines: 29 According to kjeld@iesd.dk (Kjeld Flarup): >According to chip@ateng.ateng.com (Chip Salzenberg): >>I've become interested in the use of "redirectors" in extending MS-DOS's >>idea of a file system. > > Instead you should keep at int 021H and put a layer above that. It is >not a problem to make a program belive i got an virtual drive if it uses file >handles. However if the program uses the old DOS 1.0 file control blocks you >may have some hard work to do. Anyway you must have a tecnical reference over >MS-DOS. This is the "SHELL" approach I described in my article. I want to avoid this approach if possible. Several people (thanks!) have mailed me with information on the redirector interrupt being documented in the standard interrupt list, and that it's on interrupt 2Fh, with AH=11h. The minor function is in AL; unfortunately, with the exception of the standard functions 00/01/FF, there's no hint of which minor functions do what. Sigh. I've been recommended the book "Inside NetBIOS" for further information. I'm currently trying to locate a copy of that book. Thanks for the info, all. If you find out anything I haven't posted, please don't hesitate to send E-Mail. -- Chip Salzenberg or A T Engineering Me? Speak for my company? Surely you jest! "It's no good. They're tapping the lines."