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@6018.ADF Gateway Communications G/Ethernet Controller
3Com Drivers Page for David Systems Products (archived)
(Look for "6500/6501/6502" items, these seem to be relevant.)
Based on content by William R. Walsh (original HERE).
David Systems Ether-T Controller
F1,2,3,4 Blue potted parts
JP1 AUI or RJ45 select
LINK Unknown (set to "on" on my)
M1 Valor PT3785
P1 AUI connector
P2 RJ45 connector
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U1 Ethernet Address
U3,4 Samsung KM62256ALP-10
U12 NS DP8390DN
U29 AT&T T7220PC
X1 20.000 MHz
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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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