< The RX02 is a single Mitsubishi 1/2 height 8". It's not an RX02 but one of the workalikes, RX02 (DEC) are control data with DEC boards and are very full height. < Question: Is the RLV11 appropriate and if so, which slots do they <go in? No, not for that box. However the backplane sounds like 18 slots of AB bussing and not the AB/CD bussing you need). The key is the two cards in the right hand slots. Allison