12-10-2012
I would say the controllers you are talking about might be on a disk storage which has normally 2 controllers on it.
Cheers,
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MCA(4) BSD Kernel Interfaces Manual MCA(4)
NAME
mca -- introduction to machine-independent MCA bus support and drivers
SYNOPSIS
mca0 at mainbus?
options MCAVERBOSE
Machine-dependent; depends on the bus topology and MCA bus interface of your system. Typical MCA buses are connected directly to the main
system bus.
DESCRIPTION
NetBSD includes a machine-independent MCA bus subsystem and several machine-independent MCA device drivers.
HARDWARE
NetBSD includes machine-independent MCA drivers, sorted by device type and driver name:
SCSI controllers
aha Adaptec AHA-1640 SCSI interface
esp NCR 53C90 SCSI Adapter
Disk and tape controllers
edc IBM ESDI Fixed Disk Controller
Serial interfaces
com NS8250-, NS16450-, and NS16550-based serial cards.
Network interfaces
tr TROPIC based token ring interfaces
ate Allied-Telesis 1720 Ethernet interface cards
we WD/SMC WD80x3x Ethernet interface cards and clones
le SKNET Personal and MC+ Ethernet interface cards
elmc 3Com EtherLink/MC (3c523) Ethernet interface
ep 3Com EtherLink III 3c529 Ethernet interface
tra Tiara LANCard/E and Standard MicroSystems 3016/MC Ethernet interface
SEE ALSO
aha(4), ate(4), com(4), edc(4), elmc(4), ep(4), esp(4), le(4), ne(4), tr(4), tra(4), we(4)
HISTORY
The machine-independent MCA subsystem appeared in NetBSD 1.5.
BSD
March 3, 2005 BSD