>The reason we need those specific Compaq laptops is that they run a bespoke CA card which is installed into them," explains a McLaren spokesperson to Jalopnik.

>The reason we need those specific Compaq laptops is that they run a bespoke CA card which is installed into them," explains a McLaren spokesperson to Jalopnik. "The CA card is an interface between the laptop software (which is DOS-based) and the car." If you've never heard of a CA card, then Jalopnik commenter Mike Herbst helpfully explains it's a Conditional Access card. Modern PCs use smart cards or USB keys with special access codes to access sensitive systems, and the CA card was used as custom hardware as part of an integrated system for security and copy protection.