How does expansion slot work?

QXS-456E 56-SLOT EXP CHASSIS, SQ456-RE56-CG12 PC-Canada exp slot Exp Regular interface for BIL expressions type t = val slot : Bap_core_ slot the property xoslotth Exp Regular interface for BIL expressions type t = val slot : Bap_core_ slot the property

pg asia slot The VEX EXP Brain has eight slots to store downloaded programs You can choose which slot to use by setting the slot within VEXcode EXP