Hi, On Fri, Mar 22, 2013 at 12:35 AM, John Sowden <jsow...@americansentry.net> wrote: > > I just downloaded defrag.exe, a Freedos 32bit defrag program for DOS.
It's not 32-bit at all, AFAICT, only a 16-bit MZ DOS .exe compiled by Turbo C++ (though seems to have some support for building with OpenWatcom as well). Latest version seems to be 1.32 from 2009: http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/dos/defrag/ > Unfortunately, I received the immediate notice in RED that it will not > run under windows, a reasonable declaration. Unfortunately, neither of > the two computers that I ran defrag on was running Windows: > 1) On computer #1, Windows was on the computer, but it was not executed, > as I run DOS (7.0 for 32 bit file system). All programs are run in true > DOS, not DOS under Windows. MS-DOS 7, I presume? (Yes, I know FreeDOS kernel with FAT32 support defaults to version 7 as well, but this shouldn't be a problem, especially since you can put "VERSION=x.yy" in your FDCONFIG.SYS and/or use Eric's CALLVER.COM utility if needed). > 2) Computer #2 boots into either DOS (7.0) and 4DOS or Linux (Suse > 8.x). Since it only has 48 MB RAM, I don't use Suse on this computer. > > Q: How is defrag deciding that it is running under Windows (when it > really is not)? The relevant files seem to be these: defrag/source/defrag/environ/os_id.c defrag/source/defrag/environ/checkos.c os_id.c is the one that has the get_os() function. It checks for Windows via 0x1600 and 0x160A, int 2Fh. checkos.c seems to abort if one of three conditions is met: * if IN_WINDOWS(os) is true * if DPMIinstalled() is true * if ((os != FreeDOS) && (id_os_ver[DOS].maj >= 7)) I suspect that since you're (presumably) running MS-DOS 7 that it sees it's not FreeDOS (OEM != 0xFD) and_also is version 7, hence it assumes Win9x. ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
