The 3 Com 3C509 is a 10Mbps network card from 3 Coms popular Etherlink III series, it was introduced in 1994. There are versions with different connector types availiable, with the Combo variant shown here being the most versatile.
This card's boot ROM socket will take a standard 28-pin ROM chip.
The card's DOS drivers come with a configuration program (3C50XCFG.EXE) that can be used to enable the ROM socket (it is disabled by default) and set the base address, as well as adjust all the usual options like base address and IRQ. If used in an EISA board the card can be set to EISA mode by use of the utility and later configured by the ECU.
- I/O address: 0x280, 0x300, 0x310, 0x320, 0x330, 0x340, 0x350.
- IRQ: 5, 7, 9, 10, 11, 12.
- Boot ROM size: 8 kB, 16kB, 32kB, Disabled.
- Boot ROM: 0xC0000 - 0xDE000.