Prateek,

Welcome to the 8052.com forum.

To find out exactly, what the assembler does, look into the list files (I am not quite familiar with Keil, but, generally, these have the same name as the source file except the extension is .LST or similar). It is the detailed result of the assembling process, where you can see what and where is placed in the output file.
With Keil, you also had to go through linking, so you might also want to look at the so called mapfile.

Both the assembler and linker also output a message, whether the processing was OK or not. This might be partially hidden by the windowy IDE if you are using it; generally this sort of information is displayed in a status line or in a small window on the bottom.

What I think might have happened is, that the bytes defined by DB at the file beginning might be located (by default) at the beginning of the code memory, and then get overlapped by the actual code itself - either in the assembler or by the linker. They should give at least a warning about this.

There are two very good freeware assemblers, one from Metalink, and the other is called ASEM. Both come with excellent (for free programs) documentation; and both produce the resulting hex without linking, which is maybe a better option for simpler tasks.

Jan Waclawek

PS. In the delay routines, the #-s are still missing... :-)