Undocumented Information

• Pentium Machine-Specific Registers
• UPDATED 8/98 US Robotics Sportster commands
• Quarterdeck program commandline switches
• Diamond TV

Other Folks' Undocumented Info

• Andrew Schulman's Unauthorized Windows 95 (the original seems to have disappeared, but a mirror is still online)
• Robert Collins' Intel Secrets page
• Christian Ludloff's 80x86 Site