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Joined: Sep 2006
Posts: 3,290
Member
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Member
Joined: Sep 2006
Posts: 3,290 |
Well, I remember that there were the 1-pair method, the half-pair method, and the no-pair method, the last using the 400-type card that had about a pound of electronics on daughter boards, made by Melco (?). It relied, I think, on voltage drop for detection.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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