David Systems/Gateway Communications Ethernet Adapter
Card-ID 6018


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

Outline
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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Copyright ©2005 by William R. Walsh. All Rights Reserved. Permission is granted to reproduce this material in its original form, or to use it in other projects. However, you MUST provide credit for any of the text and outline that you use. There are to be no charges assessed for access to this information other than those required to cover connectivity, media or duplicating expenses.