2. The Stack Segment and .STACK directive

• The stack is assembled as uninitialized segment of a finite size.

• For example, the .STACK directive

      .STACK   4096
  

  tells the assembler to reserve 4096 bytes of uninitialized storage.

• The operating system initializes ESP to the address of the first byte above the 4096 bytes in the stack.

• A larger or smaller stack could be allocated, depending on the anticipated usage in the program.