Sentence:  When the microprocessor decodes the JSR opcode, it stores the operand into the TEMP <WSD>register</WSD> and pushes the current contents of the PC ($00 0128) onto the stack. 
Meaning of the word marked with <WSD> tags:  A small unit of very fast memory that is directly accessible to the central processing unit, and is mostly used to store inputs, outputs or intermediate results of computations.