IBM Assembler Question:
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How to initialize a register to 0000?

Answer:

XR Rx,Rx

This is the best way and most efficient way of initializing
the register values or Label values to '0'.

Its because the time required to execute a Logical
Instruction is always less than the Arithmetic Instructions.

e.g SR Rx,Rx consumes more execution time than XR Rx,Rx.

So XR Rx,Rx is a better way to do obtain our target.

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Why do we use "drop"? What does "using" do?What is house keeping in assembler? And explain the following code

HELLOTSO START 0
* PRINT NOGEN
BEGIN SAVE (14,12)
LR 12,15
USING TYPE,12
ST 13,SAVE+4
LA 11,SAVE
ST 11,8(13)
LR 13,11