I think RSX has something called autoconfig which will tell you how your system is configured (apparently by actually touching the hardware).... RT-11 can only tell you a part of the information, and only if it matches the configuration of the handers... SHOW CONFIG will tell you about the machine itself (processor, memory, fpu, etc) while SHOW DEVICES will list all the devices for which at least the CSR the handler knows about responds... even if the CSR is the wrong one for that handler... 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 | +--------------------------------+-------------------------------------+