A simple keyboard based password lock. It uses a ROM module to check each letter inputted to see if it matches the ROM address. If it doesn't match, it will reset and turn on the "denied" light. Once the pointer hits "00", it will assume it's read all the characters, and will grant access.

 To save you the trouble, the password is "password" (the best password ever made). You can adjust the ROM to use a different password if you want.