Sentence:  When the microprocessor decodes the JSR opcode, it stores the operand into the TEMP register and pushes the current contents of the PC ($00 0128) onto the <WSD>stack</WSD>. 
Meaning of the word marked with <WSD> tags:  A portion of computer memory occupied by a '''stack''' data structure, particularly ('''the stack''') that portion of main memory manipulated during machine language procedure call related instructions.