Thanks for your replies Manuel and Niilo.

So, according to ahc(4) Adaptec's AHA-2920 and AHA-2910 are supported by
NetBSD/i386 1.5.1.  I wonder why my PC, which has a JVC XR-W2010 CD-RW
drive attached to an AHA-2920, can't see either of those devices when it's
running NetBSD?

During the initial booting stage there's a message from the AHA-2920's BIOS:

    Adaptec AHA-2920 BIOS v3.0
    Copyright (c) 1994-95 Adaptec, Inc. All Rights Reserved

    Scanning Controller 0...
    SCSI ID #3 - JVC    XR-W2010        Firmware Rev. 1.5.1 (A)

so they are being recognised by the hardware.

For some reason, the only mention of a SCSI device during NetBSD's probing
(and in dmesg's output) is:

Future Domain TMC-18C30 (36C70) (SCSI mass storage) at pci0 dev 16 function
0 no
t configured

This is what happened when I attempted to mount a CD (the result was the
same for all the cd devices I tried):

    # mount -t cd9660 /dev/cd0a /mnt
    mount_cd9660: /dev/cd0a on /mnt: Device not configured

I tried to use scsictl but it got nowhere (again it didn't matter which
scsibus device I used):

    # scsictl /dev/scsibus0 identify
    scsictl: /dev/scsibus0: Device not configured


Ray


>> Dear NetBSD/i386:
>>
>> It seems that NetBSD/i386 1.5.1 doesn't support Adaptec's AHA-2910 or
>> AHA-2920 SCSI adapters; and there's no way around that?
>>
>> A CD-ROM drive attached to a (supported) SCSI adapter is "attached" to a cd
>> device isn't it?
>
>Yes.