This uses redlogic (the updated redpower) to create a number pad like on you keyboard (if you have one)
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INSTRUCTIONS:
-Input number (23 or something)
-Press enter number (green button)
-Switch number (yellow)
-Reset number pad (The red one next to 0)
-Input next number (17 or something)
-Enter the number in (green button)
-Get desired output and press both red buttons ( one near output display and the one next to 0)
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Progress:
-The layout for the display and number pad-Done
-Number pad decoder and memory-Done
-Other stuff for final input-Done
-Adder-Done
-Displays-Done
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There's a new, better version, link:
Redlogic Calculator 2.0