mca —
introduction to machine-independent MCA bus support and
  drivers
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.
NetBSD includes a machine-independent MCA bus subsystem
  and several machine-independent MCA device drivers.
NetBSD includes machine-independent MCA drivers, sorted
  by device type and driver name:
  - aha
- Adaptec AHA-1640 SCSI interface
- esp
- NCR 53C90 SCSI Adapter
 
  - edc
- IBM ESDI Fixed Disk Controller
 
  - com
- NS8250-, NS16450-, and NS16550-based serial cards.
 
  - 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
 
aha(4),
  ate(4),
  com(4),
  edc(4),
  elmc(4),
  ep(4),
  esp(4),
  le(4),
  ne(4),
  tr(4),
  tra(4),
  we(4)
The machine-independent MCA subsystem appeared in NetBSD
  1.5.