"M" : a memory operand is allowed, with any kind of address that the machine supports in general.
If the size of the operand is not specified in the instruction, that means either that the size doesn't matter (as in logical instructions, for instance) or that it is using a 32-bit value size.
It adds together the register in the second operand with the constant in the third operand, and stores the result in the register specified in the first operand.
It also provides for byte, halfword, word, and quadword operand fetches and stores between storage and a set of 32 Vector Registers (VRs).
If either operand is unsigned, then the type to which the operand is coerced is unsigned.
The operations that can be performed on the operand stack are all defined independently of any native processor's instruction set.
If one operand is longer, then the type to which the operand is coerced has the same length as the longer operand.
Still, they were better than command lines, where you had to remember a sometimes complex command syntax, as well as the exact spelling of every operand you wanted to act upon.
An alternative is to use the format operator, %. When applied to integers, % is the modulus operator. But when the first operand is a string, % is the format operator.
The purpose of this method is to store the currently displayed number into the accumulator, to store the specified operation as well, and to reset the display for input of the next operand.
If the character is an operand, push it onto the stack.
Step 4: All operators are binary, which means that the first operand is positioned before the operator, and the second operand is positioned after the operator.
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