> > Without a true SB card, I can't duplicate the problem, but I would strongly > bet against the Windows-introduced and flavored GEMMIS being used in any > meaningful (or at least critical) manner by DOS4G -- or any other DOS > extender of notable popularity. Function 4a15h is much more likely, > although until two weeks ago I had never verified that anyone actually used > the function on a live application. It would be pretty easy to test DOS4G, > however. Run a DOS4G application under a debugger, trap the int 2fh > interface, and breakpoint on condition ax=4a15h. Unfortunately, I believe > this approach will not work here in the absence of a SB card, since card > detection and branch past unsupported code likely occurs prior to any I/O > permission setup via 4a15h. >
I was advised (thanks Eric!) that there exists a "SB" option for FD-Emm386. Setting this option indeed cures the SB MPU issues for the protected-mode games I tried. So the int 2f, ax=4a15 interface obviously is not used, and from how it is designed it may be restricted to emulate hardware for real-mode apps only. OTOH, the SB drivers work for any kind of apps (if they *do* work). ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
