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Difference between SIM and RIM instructions in 8085 microprocessor 

Set Interrupt Mask (SIM) :
In 8085 Instruction set, SIM stands for “Set Interrupt Mask”. It is 1-Byte instruction and it is a multi-purpose instruction.

The main uses of SIM instruction are –

• Masking/unmasking of RST7.5, RST6.5, and RST5.5
• Reset to 0 RST7.5 flip-flop.
• Perform serial output of data.

Read Interrupt Mask (RIM) :
In 8085 Instruction set, RIM stands for “Read Interrupt Mask”. It is a 1-Byte multi-purpose instruction.

It is used for the following purposes –

• To check whether RST7.5, RST6.5, and RST5.5 are masked or not.
• To check whether interrupts are enabled or not.
• To check whether RST7.5, RST6.5, or RST5.5 interrupts are pending or not.
• To perform serial input of data.

Difference between SIM and RIM instructions in 8085 microprocessor: