ASM Libs are libraries that are used by the compiler.

They contain machine language statements for various statements and functions.

 

A library can also be used to modify an existing function.

For example when you use a conversion routine num<>string with a byte variable only, the routine from the MCS.LIB has some overhead as it can also convert integers,word and longs.

 

You can specify the MCSBYTE.LIB or MCSBYTE.LBX library then to override the function from MCS.LIB.