If the yellow light blinks on the CAC reader, then the computer has added the smart card as a device and the card will work properly FIRMWARE UPDATE for SCR-331 Reader (Requires a physical Windows computer, Mac using Bootcamp, or TENS / LPS (see next sentence below).
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SCR331/SCR3310 Contact Smart Card Reader. Part No: 904334, 905185. ISO 7816 compliant, small, ergonomic USB smart card reader with bottom side mounting holes.

Then I plugged it into my mac, put my CAC card in and was on DoD website once I added the certificates. It is working good, though I wish Safari was better! Note: I am using OSX 10.5.2 and a USB ActivCard reader. How to use CAC card reader on Mac OS. Wondering how to use CAC card reader on Mac and don’t want to buy a PC instead? I had the same question prior to starting my career in Army, Although buying.

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