Sistemoj

CP/M

• CP/M: Seasip Main Page
• Unofficial CP/M Web Page
• CP/M Files
• Gaby's Homepage für CP/M und Computergeschichte - Computermuseum und CP/M-Zentrum

VMS

• The OpenVMS Hobbyist
• freevms

Diversaĵoj

• GEM
• MTS: Michigan Terminal System
• Operating System Sucks-Rules-O-Meter
• OS News
• Oberon Home Page
• TIX - A Tiny Operating System
• Unununium - homepage