# 091 National Semiconductor Adversary By Oliver , on 15 April 2019 09:35 1976 - National Semiconductor Adversary Other variants # 392 Heathkit GD-1999 1976 - Heathkit GD-1999 https://www.olpix.com/index.php/en/olpixblog/entry/2022/01/21/heathkit-gd-1999