Category Archives: Pentium

Maximum Overkill

Posted on July 24, 2026 by Michal Necasek

A reader pointed at the 1992 game Comanche: Maximum Overkill by NovaLogic as a possible unreal mode user—since the original game release was known to be problematic. I examined the game and found no unreal mode usage, just a rather … Continue reading →

Posted in 486, Bugs, DOS Extenders, Intel, PC history, Pentium, x86 | 45 Comments

Undocumented RDTSC

Posted on April 27, 2018 by Michal Necasek

The other day I wrote a simple DOS program which used the RDTSC instruction in order to obtain precise time measurements (of how long it takes a PS/2 keyboard to send data; more about that some other time). The 16-bit … Continue reading →

Posted in Documentation, Intel, Pentium | 15 Comments

Intel OverDrive Part II: Pentium OverDrive

Posted on June 30, 2016 by Michal Necasek

The Pentium OverDrive is notable for supporting three physically different sockets (that’s not counting the Pentium II OverDrive). The Pentium OverDrive product was sold in variants suitable for Socket 2/3 (486 systems), Socket 4 (early Pentium systems), and Socket 5/7 … Continue reading →

Posted in 486, Intel, PC history, Pentium | 34 Comments