QL BEXs4

QL BEXs4 is the identification which appears on the back of a 2 slot expansion bus card from German company ABC Elektronic and designed by Jürgen Falkenberg.

QL BEXs4 had 2 expansion slots, allowing you to add memory expansion, disk interface etc to a cased QL. Simply connect the female slot to the QL's standard expansion port, and then you have 2 further expansion slots to hold your QL interfaces.