Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!husc6!bloom-beacon!oberon!cit-vax!mangler From: mangler@cit-vax.UUCP Newsgroups: comp.periphs Subject: SI9900 and drive fault ATTN Message-ID: <4707@cit-vax.Caltech.Edu> Date: Mon, 30-Nov-87 02:45:16 EST Article-I.D.: cit-vax.4707 Posted: Mon Nov 30 02:45:16 1987 Date-Received: Wed, 2-Dec-87 04:14:32 EST Organization: California Institute of Technology Lines: 17 Keywords: SI9900 massbus cdc9766 vax-780 configuration is cdc 9766 as drive 0 on a SI 9900, massbus #0 on a vax-780. When putting a potentially dusty pack into a CDC 9766 (top-loading 300 MB disk drive), it is standard field-service practice to turn off the servo circuit breaker before spinning up the pack the first time, as a "purge" cycle. Naturally, this produces a voltage fault. So long as this (perfectly normal) fault persists, I can't seem to turn off the "attention active" bit. Trying to reset the bit in RMAS does nothing, nor does a Drive Clear or Release command make it go away. Is there any way to shut up a drive fault interrupt, short of turning off the interrupt enable for the entire controller? The CPU can't get any work done if it is being continuously interrupted by a down drive. Don Speck speck@vlsi.caltech.edu {amdahl,scgvaxd}!cit-vax!speck