> There is a simple int21h AH=33h AL=FFh call you can make (no program I > know of off hand that does it but from debug you should be able to get > it easy) to get a pointer to the version string displayed at boot. > > Something like (completely untested, possibly simpler ways) this in > debug: > a > mov ax, 33ff > int 21 > <enter on blank line> > t > t > r > d <value in DS>:<value in AX> > > All it does is use a to switch debug to assembly mode, input the > instructions to execute the kernel interrupt that returns the version > string, then trace just those two instructions (do not run with g), > display the registers so you can see the values returned in DS:AX, and > then using those values display (dump) the data there.
The pointer is returned in the DX:AX register pair, not DS:AX. With FreeDOS DEBUG, the registers can directly be used in the d command, too. These lines can be entered on FreeDOS DEBUG's prompt then: > a > mov ax, 33ff > int 21 >t > t > d dx:ax The first ASCII zero (00 in the hex view) ends the returned string. Enter a single "q" on DEBUG's prompt to exit DEBUG. Regards, Christian ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
