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Technology Stocks : Ampex Corporation (AEXCA)
AMPX 11.00+8.4%Jan 16 9:30 AM EST
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To: Hal Campbell who wrote (12817)12/4/1999 11:42:00 PM
From: Chris Elsass  Read Replies (4) of 17679
 
hal,

I do not know the specifics of how a credit card reader works, but I do understand how KM is supposed to work. The main idea is that a "soft keeper" is applied to the "hard magnetic medium" that the information is stored in. The soft keeper can then either entirely contain the stray magnetic flux lines of the "hard medium" or some fraction there of. For maximum stability and density of information it seems as though all of the stray flux would be contained. Under this scenario a read head would not have any signal to couple to if there is no bias applied. The applied bias saturates the keepered layer, expelling the flux lines contained within it( i.e. the information stored on the hard magnetic medium). So I suspect a new reader would be required.

Another variant would be to put the keeper layer below the hard magnetic medium. This would give some additional stability and allow closer spacing of the information without requiring the bias, possibly?.

As with any technology there are a lot of variables to optimize for a given application, and by knowing what your goal is, a give and take usually develops. I think new readers are required to take full advantage though, especially when they mention security features.

It may be possible to have a dual-accepted smart card/credit card that could be read by the existing machines as a regular credit card but the new machines would read it as a smart card.

I hope this confusing, not to the point answer, or lack there of, helps.

Chris
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