12 INT 12 - BIOS - GET MEMORY SIZE
12 INT 12 - CPU-generated (Pentium +) - MACHINE CHECK EXCEPTION
12----CX1806 INT 12 - KEYBUI v2.0+ - INSTALLATION CHECK
12----CX1807 INT 12 - PARKER v2.0+ - INSTALLATION CHECK
1205D7BX05D7 INT 12 U - Borland C++ IDE - INSTALLATION CHECK
124350BX4920 INT 12 C - CPI-standard virus - "FRIEND" CHECK
12FFFECXFFFE INT 12 - Back&Forth v1.62+ - API