Hardware emulating the Classic HP16C Calculator.

Features:

• All Through Hole parts. (easy to handle and solder)
• Runs about 4x faster than the original
• Memory registers: same memory as the original.
• Continuous memory (Memory is not lost when calculator is turn off).
• Auto power off
• Runs on a single ATMEGA328 8 bit microcontroller running @ 8MHz (same as Arduino Uno)
• Speaker for audible keypress feedback
• 192x64 lcd display
• Display Backlight
• Has a real time clock. (Uses a 32.768KHz crystal)
• Uses a single CR2032 3V battery.
• Power consumption: 1µA off, 350µA idle, 3mA working (this is with speaker and backlight off)
• Microcontroller comes preprogramed. 
• Can run any of the Voyager series and HP41C calculators, downloading the appropriate firmware. 
• Top and bottom aluminum panels.