If you have Unibus, you can't possibly be using an RQDX2 controller. RQDXn series was Qbus only... (the only Unibus machine it might work in is the 11/84, but only in the qbus portion of the machine). No. You need an ESDI controller. Like the DEC KFQSA, or the Andromeda ESDC, or an Emulex QD-22 (?) Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+