Settings for a DELUA: (M7521, single board Ethernet interface) Address selection, Switch at E106, Sw1 -> A12 ... Sw10 -> A3; switch on is a zero for the address bit. Def: 774510 => (1) FFNNFNFNNF (10) Vector selection, Switch at E69, Sw4 -> V8 ... Sw10 -> V2; switch on is a zero for the vector bit. Def: 120 => (4) NNFNFNN (default address for first DELUA is 774510/120, secondary would be 760460/400) Boot option, Switch at E69: 2 3 N N Remote boot disabled * def for VAX N F Remote boot from boot ROM F N Remote boot and system load F F Remote boot disabled (there is no default for a PDP-11) Switch E69 position 1 is used for Loop Selftest: continuous selftest when on. (power-up starts test.) The only jumper appears to be the priority plug. To achieve loopback on the AUI, you can connect AUI pin 3 to 5; and pin 10 to 12. --- --al. Alan Sieving, ars@quickware.com or ars@world.std.com Quickware Engineering & Design, 225 Riverview Ave Waltham, MA, 02154-3874 W: 617-647-3800, FAX: 617-647-3311 800-237-1185 for fast PDP-11's.