Why not also support “industrial” digital I/O cards?
Since the first “Standard” parallel interface adapter was introduced by IBM in 1981, it has proven itself to be rugged, inexpensive and readily available from numerous manufacturers. The design of the parallel port has been further standardized under the IEEE-1284 specification, commonly known as “ECP”. Unless there emerges a compelling reason to change to a less standardized and more expensive “industrial” type card, we feel that oldest “Standard” and the newest IEEE-1284 parallel interface adapter provides the most optimum hardware platform for our software.