The E2420 Decoded 64 Key Keyboard is an easy to use data entry device encoding 64 keys into a glitch free 8 bit code on the make of each key closure. A robust key lockout algorithm prevents multiple keys from sending erroneous codes. All 64 keys are scanned within 3 ms while providing a 20 ms debounce time for each key. The baud rate is selectable using solderable jumpers. A clocked serial data output similar to a PS/2 interface but running at 100 KHz is also provided. An 8msec trigger output is active 50 µsec prior to the data being sent. An LED flashes each key closure and a typematic function is also included. The keys are labeled with their keycodes on the PCB and the keyboard is easily mounted with #4 hardware. Power input is +3.3V to +5.5V and the outputs are TTL compatible.