From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Mon, 14 Jul 1997 09:17:33 -0400
From: jmk@plan9.bell-labs.com jmk@plan9.bell-labs.com
Subject: SCSI woes.
Topicbox-Message-UUID: 5d15d1cc-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19970714131733.nuOSP6UFAtA0610qi61FofkUlqbAXVrZohTEYfoCQTo@z>

if you look in the driver (kernel or b.com) as to which command "adaptec0: invdcmd #01, len 5"
refers to (Cmbinit = 0x01), the following comment in the reset routine may give
a clue
	/*
	 * If the BIOS is enabled on the 1542C/CF and BIOS options for support of drives
	 * > 1Gb, dynamic scanning of the SCSI bus or more than 2 drives under DOS 5.0 are
	 * enabled, the BIOS disables accepting Cmbinit to protect against running with
	 * drivers which don't support those options. In order to unlock the interface
	 * it is necessary to read a lock-code using Cextbios and write it back using
	 * Cmbienable; the lock-code is non-zero.
	 */

i think this was an addition after the cd-rom was cut.

--jim