Through Interrupts with the T (Trace) command. The P (Proceed) command was added, so DEBUG could quickly execute subroutines at the same time, it became possible to attempt stepping COM programs have been assembled with this command. Though lacking much of the functionality of a stand-alone Assembler,Į.g., all Jumps must be to hexadecimal addresses (no labels can be used), many
This is one of the most important commands for many of its
Microsoft script debugger download code#
Gained the ability to assemble instructions directly into machine code (theĪ command). [ Thanks go to Tim Paterson himself for reviewing There and little has been added to it (the major exception being the Assemble All the functionality that Tim put into DEBUG is still Personal Computer DOS 1.00 in 1981, his DEBUG.COM utility Tim was then hired by MicrosoftĪs the primary author of their first OS. In the meantime, Microsoft® hadīeen busy purchasing the rights to sell Tim's QDOS to IBM®įor their 'secret' PC project. COM program under QDOS, and also added the ability The code for that ROM version was released into the Public Domain. (later called 86-DOS) to work correctly, Tim created a debugger in a ROM chip He had designed for SCP ( Seattle Computer Products) the