Hi, all! I recently purchased a large batch of old QBus cards to expand some of the systems in my collection, and one of the cards in the batch is rather unknown to me... I know its some kind of disk controller, guessing MSCP ST-506 but I'm wondering if its SCSI because i'm seeing some resistor packs on the board that could be terminating resistors, I suppose... anyways, here's the information: (Label on top of large 48 pin IC) "TD Systems Inc. Lowell, MA - USA VIK/QDT #2111" (Label on 28 pin ROM) "Viking Q/B A4.0"