[NCjim]

The instruction is a storage-to-storage instruction, capable of moving up to 256 bytes from the storage location at the address specified by the second operand to the storage location at the address specified by the first operand.

Storage is fetched one byte at a time from left to right. Knowing this, back when storage was at more of a premium than processor cycles, you could set 256 bytes of storage to blanks with two instructions:

MVI 0(R2),C' '
MVC 1(255,R2),0(R2)

Kind of grows on you, doesn't it? :-)

[Hunble]

MVI 0(R2),C' '

MVC 1(255,R2),0(R2)

Now THAT I recognized!

[Hunble]

On the right rear of every M1 Abrams tank, you will see a little tube sticking up.

We were asked by the U.S. Army to invent a method of measuring the wind speed and direction, with no moving parts.

The three of us invented that instrument!

That is what I have done for the last 35 years as a software engineer. I make things happen, even if nobody will ever know my name.