SIM (set interrupt mask)

SIM set interrupt mask is used for interrupts handling in 8085: It implies that the instruction mask the interrupts. However the instruction must be executed in order to use the interrupts.It having the following functions:

1. To set the RST 7.5, 6.5 and 5.5 interrupts.
2. To Reset RST 7.5 Flip Flop.
3. To Implement series I/O transmit D7 bit  to transmit data.