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EO(4)			    BSD Programmer's Manual			 EO(4)

NAME
     eo - 3Com EtherLink (3C501) Ethernet interface

SYNOPSIS
     eo0 at isa? port 0x320

DESCRIPTION
     The eo interface provides access to a 10 Mb/s Ethernet network.  It uses
     a jumper-selectable block of 16 i/o ports in range 0x200 through 0x3f0.
     The block must be aligned on a 16 port boundary.  The jumper-selectable
     hardware interrupt level is detected at autoconfiguration time or alter-
     natively can be specified in the kernel configuration file.  The 3C501
     supports the following irqs: 2(9), 3, 4, 5, 6, 7; it can be installed in
     8-bit or 16-bit slot.  DMA is not supported in the standard driver, but a
     compile flag turns it on for use with very old 3c501s.  In this case the
     DMA channel should be selected by the on-board jumpers and specified in
     the system configuration file. Supported drqs are: 1, 2 and 3.

     Each of the host's network addresses is specified at boot time with an
     SIOCSIFADDR ioctl.	 The ef interface employs the address resolution pro-
     tocol described in arp(4) to dynamically map between Internet and Ether-
     net addresses on the local network.

MEDIA SELECTION
     The type of interface (10BASE-2/BNC or AUI/DIX) is selected manually by
     the on-board jumpers.

DIAGNOSTICS
     The following diagnostics may be printed during autoconfiguration:

     eo%d: invalid i/o base address %x

     Invalid port specification in kernel config file.

     eo%d: invalid IRQ number %d

     Invalid irq specification in kernel config file.

SEE ALSO
     intro(4),	inet(4),  arp(4)

BUGS
     Usage of this Ethernet interface card is not recommended because of se-
     vere performance problems and loss of packets when it is used to communi-
     cate with machines equipped with faster Ethernet interfaces. This card is
     no longer manufactured.

HISTORY
     The eo driver first appeared in BSDI.

BSDI BSD/OS			October 9, 1992				     1

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