Answer Posted / tarun aggarwal ymca

Read Interrupt Mask (RIM)
RIM is a multipurpose instruction used to read the status of
interrupts 7.5, 6.5, 5.5 and to
read serial input data bit. RIM loads 8-bit data in the
accumulator with the following
interpretation:
Actually RIM does the following three tasks:
1 Read the interrupt mask (bit 2, 1, 0).
2Identify pending interrupts (bit 6, 5, 4).
3 Receive serial input data bit (bit 7).

SIM is a multipurpose interrupt used to implement the 8085
interrupts (RST 7.5, 6.5, 5.5)
and serial data output. SIM interprets the accumulator
content as follows:
Actually, SIM does the following three tasks:
1Mask the interrupts (bit 2, 1, 0).
2 Reset RST 7.5 (bit 4). This is mainly used to overwrite
RST 7.5 without serving it.
3To implement serial I/O (bit 7, 6). If bit 6 = 1 is used
to enable serial I/O and bit 7 is
used to transmit serial output data bit.

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