Do not panic if you see a diagram that shows 4 RAM slots but your board only has 2. The manual covers several revisions. Focus on the text references to “M32CD/G11CD” – those match your board.
ASUS occasionally restructures its support website. If the direct link no longer works, here is your backup plan: asus n13219 motherboard manual link
A: Page 1-12 of the manual shows it located between the PCIe x16 slot and the rear I/O panel. It is a standard CR2032 coin cell. Do not panic if you see a diagram
Many third-party sites claim to host the “ASUS N13219 manual,” only to give you a virus or a generic guide. Follow this safe process: ASUS occasionally restructures its support website
Go directly to the link provided above. Do not click on “Download Now” buttons from random PDF hosting sites.