David Systems/Gateway Communications Ethernet Adapter
Card-ID 6018

3Com Drivers Page for David Systems Products
(Look for "6500/6501/6502" items...these seem to be relevant.)

David Systems / Gateway Communications Ethernet

U1 – Ethernet Address
U3, 4 – Samsung KM62256ALP-10
U12 – National Semiconductor DP8390DN
U29 – AT&T T7220PC (what is it and who has the datasheet?)
X1 – 20.000MHz
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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