No, RLV is for Qbus... generally, if you find an option which has a Q or V as the third letter in the option name, it is for Qbus. For example, dlV, dhV, dhQ, dzV, dzQ, vsV, etc... Some options for UNIBUS have a U as the second or third of the option name... dhU, dU. But generally, the UNIBUS options are two-character names, DL, DH, DZ, VT, etc... As always, there are exceptions, like DUP, DMC, DMR... 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 | +--------------------------------+-------------------------------------+