AMR Audio Modem Riser

• AMR is a riser expansion slot designed by Intel in 1998
• Contains two rows of 23 pins each, for a total of 46 pins
• Useful for motherboards without analog I/O functions
• Used on Pentium III and IV motherboards
• Advantages
• Moves analog I/O function from motherboards to a riser card
• Allowed motherboards to be manufactured faster
• Reduces the cost of producing motherboards by incorporating audio and modem functionality on a single chip
• Frees up expansion slots for other peripherals
• Disadvantages: 
• does not support plug and play
• uses a PCI slot
• allows software-based cards but not hardware accelerated cards
• Replaced by CNR Communication and Network Riser
• For more information about riser technologies read http://www.hagmaier.net/previous_repair_webpages/riser.htm