Types of inputs and outputs for supermarket checkout.

Blog Address: http://kcigcseict2011.blogspot.com just in  case anyone forgot.

Inputs:
Magnetic Strip Reader
Bar Code Scanner
Touch Screen
Keyboard
Electronic Scales
Payment Processor
Chip and pin.

Outputs:
Dot Matrix Printer (One of last still in use, 9 Dots)
POS checkout will print out for later analysis.
Screen is for current analysis.
Alarm is for absolute now analysis.