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Credit card readers may use PS/2 connectors[1]. There are POS keyboards with integrated card readers that use PS/2 connectors, as well [2].

[1] http://support.quickbooks.intuit.com/opencms/sites/default/I...

[2] http://www.ebay.com/itm/CHERRY-MY8000-BEIGE-PS-2-KEYBOARD-CR...