I found some S-bus cards today that I don't recognize and I can't find anything about. Two were made by XES, Inc and the other by Versatec. All of them ar emarked "SBUSPI". Each card has a large S-bus DMA controller IC and D(something) 37F connector on the back panel. I'm thinking they may be a DR-11W interface but that's just a guess. Anyone know? Joe