Amazon.com: Meinl 18,Cyberify - The Y2K bug, also known as the Millennium Bug, was a programming flaw caused by the common practice of representing years with only the last two digits (e.g., ,Products – Tagged ,MZ-1U01,MZ-80A/1200 「プログラムポシェット '85 NO.2」 テクノポリスムック 千葉県産 コシヒカリ