What is ACR Slot used for?

Definition: riser card - ACR - acr slot ACR Poker FT Commentary: OSS 124H 50 views SLOT MACHINE acr slot Audio Communications Riser - was meant to be a cheap interface to plug in an ACR modem or expand upon your built-in sound

across the universe slot ACR Electronics is the leading manufacturer of EPIRBs, Personal Locator Beacons, ARTEX ELT, AIS, Man Overboard, Searchlights for the Marine, Outdoor,