SIM is Set Interrupt Mask. Used to mask the hardware interrupts.
RIM is Read Interrupt Mask. Used to check whether the interrupt is Masked or not.
In 8086 Carry flag, Parity flag, Auxiliary carry flag, Zero flag, Overflow flag, Trace flag, Interrupt flag, Direction flag, and Sign flag.
FIFO (First In First Out) stack is used in 8086.In this type of Stack the first stored information is retrieved first.
Execution Unit receives program instruction codes and data from BIU, executes these instructions and store the result in general registers.
Code, Data, Stack, Extra Segment registers in 8086.
Bus Interface Unit and Execution unit, are the two different functional units in 8086.
An interrupt which can be never be turned off (ie. disabled) is known as Non-Maskable interrupt
An interrupt that can be turned off by the programmer is known as Maskable interrupt.