Article View: sci.electronics
Article #7495Re: Wiegand wires?
From: John.Ackermann
Date: Thu, 27 Sep 1990 14:44
Date: Thu, 27 Sep 1990 14:44
14 lines
1285 bytes
1285 bytes
In article <10960034@hpldola.HP.COM> paul@hpldola.HP.COM (Paul Bame) writes:
>Speaking of credit cards, why don't we use bar codes or some other optical
>method rather than magnetic? Seems like it would be more reliable.
>
ATM cards use a magnetic stripe because the machines actually write transaction
info on on the stripe. ATMs do this so that you can't go from machine to
machine (some of which may not be online to your bank) and withdraw in excess
of your limit. Each transaction decrements the daily limit value stored
on the stripe.
--
John R. Ackermann, Jr. (513) 445-2966
Law Department, NCR Corporation VoicePlus 622-2966
Dayton, Ohio John.Ackermann@Dayton.NCR.COM
***** Amateur Radio: ag9v@n8acv or ag9v@ag9v.AMPR.ORG *****
Technical Details
Message-ID:
<480@lawday.Dayton.NCR.COM>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!samsung!emory!hubcap!ncrcae!ncrlnk!ciss!lawday!jraReferences:
<5770030@hpscdc.scd.hp.com> <10960034@hpldola.HP.COM>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!samsung!emory!hubcap!ncrcae!ncrlnk!ciss!lawday!jra From: jra@lawday.Dayton.NCR.COM (John.Ackermann@Dayton.NCR.COM) Newsgroups: sci.electronics Subject: Re: Wiegand wires? Message-ID: <480@lawday.Dayton.NCR.COM> Date: 27 Sep 90 14:44:26 GMT References: <5770030@hpscdc.scd.hp.com> <10960034@hpldola.HP.COM> Reply-To: jra@lawday.UUCP (John.Ackermann@Dayton.NCR.COM) Organization: NCR Corporation, Dayton, Ohio Lines: 14