MVO is an old instruction that has fallen out of use, replaced by SRP. Still, you will see it in older programs. This video will get you up to speed on this “odd” instruction. You will also find the code from the video here.
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The Punctilious Programmer 
Respected Sir,
Thankyou so much Sir….i am really greatful to you for this well explained MVO instruction video. Sir you are really keeping Assembler alive in India as well. Thankyou so much Sir again.
Thanks, Sankalp!
This is a great video. MVO was made so easy.
Prof. Woolbright,
I truly enjoyed your video instruction for the MVO today! I may come back to check out more soon!
Justin Shen
Thanks, Justin. Be sure to watch SRP which effectively replaces MVO in most cases.