28. Simplified Zero-Operand Instructions (not x86!)

The last group of instructions is the zero operand instructions.
Three of these instructions are illegal instruction opcodes.
The BRK (break) instruction pauses the CPU until the user manually restarts it.
- This is useful for pausing a program during execution to observe results.
The IRET (interrupt return) instruction returns control from an interrupt service routine.
- (We will discuss interrupt service routines later.)

The HALT program terminates program execution.
The GET instruction reads a hexadecimal value from the keyboard and returns this value in the AX register.
The PUT instruction prints the value in the AX register.

Index