8085: Set Interrupt Mask.

In the 8085 Assembly language instruction, SIM (Set Interrupt Mask), does the bit D3 that represent MSE-Mask Set Enable disable masking or also the interrupts...

A text book question says to write a code snippet to enable all interrupts...

The answer given is


What is wrong in the below code?
In the second code I am disabling the masking so does it disable the masking and gives all interrupts a free hand or does it diaable interrups all together?

Thanks in advance.