RIM stands for read interrupt mask and SIM stands for set interrupt mask.The SIM instruction is used to copy the contents of the accumulator into the interrupt mask.
The RIM instruction is used to interpret the RST interrupt positions.
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The SIM and RIM instructions in the 8085 microprocessor are used to set (SIM) and read (RIM) the interrupt mask. With SIM, you can mask or unmask RST5.5, RST6.5, and RST7.5, you can reset the pending RST7.5 flip flop, and you can set or reset the SOD (Serial Output Data) pin.