ebay - cardamatic

From: Tom Jennings <tomj_at_wps.com>
Date: Mon Feb 14 11:16:00 2005

On Sun, 13 Feb 2005, Geoff Reed wrote:

> isn't it just conductive traces on plastic?

You computer people, you so advanced!

Nope. Plastic card (credit card thickness, or less) with
pencil-sized holes in it. The "reader" is a matrix of electrical
contacts. You shove the card in it, it insulates the non-punched
contacts. Simple!

Alas, hard to reproduce the cards automatically. Easy with a hand
punch though.
Received on Mon Feb 14 2005 - 11:16:00 GMT

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