How does DOS load a program into memory?
When command.com is asked to execute a .com or .exe file, it will call the interrupt service 21h/AH=4B, the EXEC service. It is up to the calling program to: build a DOS EXEC parameter block (see http://www.delorie.com/djgpp/doc/rbinter/it/90/15.html ) (includes information on environment variables, command lines arguments, FCBs and register values on return) free up all … Read more