David Systems/Gateway Communications Ethernet Adapter
3Com Drivers Page for David Systems Products
(Look for "6500/6501/6502" items...these seem to be relevant.)
U1 Ethernet Address
U3, 4 Samsung KM62256ALP-10
U12 National Semiconductor DP8390DN
U29 AT&T T7220PC (what is it and who has the datasheet?)
F1, 2, 3, 4 Blue potted parts
M1 Valor PT3785
JP1 Row of jumpers to select AUI or RJ45 port
LINK Not sure, set to on on my adapter
P1 AUI connector for external transceiver
P2 RJ45 (twisted pair) connector
3Com bought David Systems as far as I can tell. The official name for this particular adapter is David Systems Ether-T Controller. It was actually manufactured by Gateway Communications for David Systems. The Gateway Communications version of the adapter is built a little differently but is functionally identical to this one. I don't know what became of Gateway Communications. The ADF above is for the David Systems variant.
What is the AT&T T7220PC used for? I see it on a quite a few older Ethernet adapters. Has anyone got a copy of the datasheet or other information regarding this IC?
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