snc(4) National Semiconductor DP8393X SONIC Ethernet adapter driver


device isa device snc


The driver provides support for the National Semiconductor SONIC Ethernet adapters.


The driver supports the following cards:

  • National Semiconductor DP83934AVQB
  • NEC PC-9801-83
  • NEC PC-9801-84
  • NEC PC-9801-103
  • NEC PC-9801-104
  • NEC PC-9801N-15
  • NEC PC-9801N-25
  • NEC PC-9801N-J02 PCMCIA
  • NEC PC-9801N-J02R PCMCIA

The driver also includes support for the National Semiconductor NS46C46 as 64 * 16 bits Microwave Serial EEPROM


Accessing SONIC card data structures and registers as 32 bit values makes code endianness independent. The SONIC is however always in big-endian mode so it is necessary to ensure that data structures shared between the CPU and the SONIC card are always in big-endian order. The driver supports the PC-98 C-Bus, and PnP buses. Support is also provided for the legacy C-Bus.


The following driver specific error messages may be reported:

"snc%d: snc_nec16_register_irq: unsupported irq (%d)"
The card returned an IRQ which is not supported by the driver.
"snc%d: invalid packet length %d bytes"
An attempt to transfer a data packet failed due to an invalid packet length.


The driver was ported from Nx by An -nosplit An Motomichi Matsuzaki Aq [email protected] and An Hiroshi Yamashita Aq [email protected] . It first appeared in Fx 4.2 . This manual page first appeared in Fx 5.3 .


This manual page was written by An Tom Rhodes Aq [email protected] .


Currently the driver only works on the PC-98 architecture. It should probably work on the i386 architecture as well.