DAD instruction or command

What is a DAD instruction?

DAD - Double Register Add is used to add registers and is used in the assembly programming language.

For example:

Double Add HL to HL

Jump Command

If the program counter is always one count ahead of the memory locations from which the machine code is being fetched, how does the microprocessor change the sequence of program execution with a "Jump" execution?

During a jump instruction, the program counter is loaded with a new address that is not necessarily the address of the next sequential instruction. After a jump, the program execution continues from the new location in memory.

similarities between CALL_RET and PUSH_POP instructions

List out the similarities between CALL_RET and PUSH_POP instructions.

When CALL is executed the microprocessor automatically stores the 16-bit address of the instruction next to CALL on the stack pointer.

The programmer uses the instruction PUSH to save the contents of the register pair on the stack.

RET transfers the contents of the top two locations of the stack to the PC.	POP transfers the contents of the top two locations of the stack to the specified register pair.
Has 8 conditional RETURN instructions.	No conditional POP instructions.