Assembly Language Programming Tutorial – 21 – Copying Smaller Values to Larger Ones

All references in this video came from:
Assembly Language for x86 Processors (6th Edition)

Brought to you by

Rasim from give us another tutorial on Assembly Language Programming . In this tutorial Rasim talks about how to copy smaller values to larger ones. Example: (mov ax, cl) won’t work because “ax” is a 16-bit register and “cl” is a 8-bit register, but Rasim show us a way around it.




Google Plus:





Sebastian Puerta Hincapie says:

Mr. Muratovic took the time to create a crash course for everyone that needs a quick hands-on application and yet he gets so many complaints. I’m assuming he has a certain time limit for each lesson but at least he’s touching on a lot of different methods and implementations that can be helpful. Don’t watch it, if it bothers you that much or simply read the book.

Stephen Reynolds says:

It seems to me that really all you are doing is moving an 8-bit value into an 8-bit register. Not actually moving an 8-bit value into 16-bit register AX. Yes, you are zeroing out AX but not actually moving var1 to AX. Since var1 is 8-bit and AL is an 8-bit register then there should’nt be any issue making this move in the first place. How do you actually move 8-bit var1 into 16-bit regester AX with only using MOV, not MOVZX or MOVSX? 

Rafael Scheiner says:

im having trouble with div because i need for the user to input both numbers and just show the answer the problem is, the register that receives the number is AL, how will i move the value of AL to AX?

Joseline Cisternas Viveros says:

¿Como puedo pasar un valor de ax a bx, utilizando ciclos, copiado bit por ciclo, partiendo por el menos significativo.?

espero me puedas responder.


Khalil Al-Nokhatha says:

Why complicating things when you have MOVSX & MOVZX instructions?

Phea utube says:

You should explain each tutorial in detail not just reading it, beginners find it very hard to catch up but thank you for your effort.

Hadi a says:

thank you

herr ste says:

another example of this:
var1 dw 1234h
xor ax,ax
mov al,byte [var1] ;copy 34h to al
mov ah,byte [var1+1] ;copy 12h to ah

Dzz says:

Where are you from?

Write a comment


Human Verification: In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Do you like our videos?
Do you want to see more like that?

Please click below to support us on Facebook!

Send this to a friend

▷ Other ReviewsVehicles▷ Show Cars▷ Motorbikes▷ Scooters▷ Bicycles▷ Rims & Tires▷ Luxury BoatsFashion▷ Sunglasses▷ Luxury Watches▷ Luxury Purses▷ Jeans Wear▷ High Heels▷ Kinis Swimwear▷ Perfumes▷ Jewellery▷ Cosmetics▷ Shaving Helpers▷ Fashion HatsFooding▷ Chef Club▷ Fooding Helpers▷ Coktails & LiquorsSports▷ Sport Shoes▷ Fitness & Detox▷ Golf Gear▷ Racquets▷ Hiking & Trek Gear▷ Diving Equipment▷ Ski Gear▷ Snowboards▷ Surf Boards▷ Rollers & SkatesEntertainment▷ DIY Guides▷ Zik Instruments▷ Published Books▷ Music Albums▷ Cine Movies▷ Trading Helpers▷ Make Money▷ Fishing Equipment▷ Paintball Supplies▷ Trading Card Games▷ Telescopes▷ Knives▷ VapesHigh Tech▷ Flat Screens▷ Tech Devices▷ Camera Lenses▷ Audio HiFi▷ Printers▷ USB Devices▷ PC Hardware▷ Network Gear▷ Cloud Servers▷ Software Helpers▷ Programmer Helpers▷ Mobile Apps▷ Hearing AidsHome▷ Home Furniture▷ Home Appliances▷ Tools Workshop▷ Beddings▷ Floor Layings▷ Barbecues▷ Aquarium Gear▷ Safe Boxes▷ Office Supplies▷ Security Locks▷ Cleaning ProductsKids▷ Baby Strollers▷ Child Car Seats▷ Remote ControlledTravel▷ Luggages & Bags▷ Airlines Seats▷ Hotel Rooms▷ Fun Trips▷ Cruise Ships▷ Mexico Tours