DCEbus


DCEbus is a computer bus standard, originally developed for industrial control computers interfacing to the "real world" by the Belgian company Data Applications International. It is physically based on Eurocard sizes, mechanicals and 31-pin connectors, and using its own signalling system, which Eurocard does not define. It was first developed in 1970 but was never adopted by any other company.
The 24 I/O lines available on the DCEbus could be used directly, or could use the "DCE bus mode", in which the 24 I/O lines were grouped in three groups of eight I/O lines, of which the first group was used for data, and of the second group two were used for read and write strobes, and one for "bus expansion", the third group was used for eight "card address lines". Most often these setup was used to control another Intel 58255 on the actual interface card. The remaining seven pins of the 31-pin DIN connector were used for power and ground signals.

Available cards

About twenty interface cards were available: