3Com 3C509B-TPO

The 3Com logo (big), "EtherLink III", "(C) 1995", "FCC ID: DF63C509B-TPO", a CE and VCI logo, "U.S. Patents: 5,307,459" is silkscreened on the left (top) side of the board.
 * "3C509B-TPO", "10 Mbps Signalling Rate", and "ASSY: 03-0020-" " REV-" is
 * "FAB: 02-0020-004 REV B" is silkscreened on the board under the Ethernet transformer.
 * The Ethernet controller is labeled with...
 * Parallel Tasking
 * 3Com
 * 40-0130-003
 * 9614S 04310892
 * AT&T 40-01303