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Answer Posted / mohit neb
ICM stands for Insert Character under Mask. Operand 1 is a register, operand 2 is a 4-bit binary mask ( eg - B'1000' or the number 8) and operand 3 is a fullword in memory.
The important point is that contiguous memory bytes from the fullword (operand 3) are copied into selected bytes of the register (operand 1). The second operand say B'1100' does that selection. So a mask of B'1010' would insert two contiguous memory bytes from operand 3 to byte one and three of the operand 1 register.
Example :-
ICM 5,B'1010',FIELD
The above instruction would insert two contiguous bytes starting from FIELD into the first and the third byte of R5.
OBJECT CODE :- ( 4 Byte RS Instruction )
1 byte - OP Code
Next 1 byte - 4 bits for teh register and the other 4 for
the binary mask.
Next 2 bytes for operand 3 - B2D2D2D2
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