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Interrupt 21h service 30h (get version number of dos)?

• Hi everyone, can anyone give me a sample source code on how to show the main version of dos (for ex. 3 in DOS 3.10) and the minor version number (for ex. 10 in DOS 3.10) separately. I am new to assembly language programming and i need to create a program that will show the version number of dos. ;for example if my computer DOS version number is DOS 3.10, and i run the program using tasm.exe and tlink.exe the output will be: THE MAIN VERSION OF DOS IS: 3 THE MINOR VERSION OS DOS IS: 10 YOUR DOS VERSION NUMBER IS: 3.10 I will really appreciate you help guys, Thank you and GOD BLESS... =)

• Answer:

  Well i can guide you coding is your part so here is the trick which i got. First of all have a look at the int 30h function at http://tutorialacademy.blogspot.com/2009/09/int-21h-general-function-despatcher.html As you see there int 30h returns the value of main version in AL and minor version in AH , So now you have to print them for printing you can use 02h service which prints character so now add 48 in the value so it will now represents a character as 48 is the ascii code of 0. So if dos version is 4.6 then it will print 48+4=52 which is ascii code of 4 and then 48+6=54 which is the ascii code of 6. Hope you got the trick. For detailed info of interrupt services you can check this page http://tutorialacademy.blogspot.com/2009/09/int-21h-general-function-despatcher.html