I found it.\n\nAs a quick introduction, SMIs were introduced to the x86 world by the 386SL.\nIt was created to allowed systems designers to have access to the CPU while\nunspecified software of any type was running. The reasons for this are\nobvious when you look at the market the 386SL was aimed it. It was Intel's\nfirst attempt at a truly mobile CPU. SMIs allowed the BIOS to control\nvarious aspects of power management on the CPU, regardless of what kind of\nOS was running on top of it. That was a good thing in the days when DOS\nstill ruled the land. DOS knew as much about power management as your\naverage light bulb, and letting the system designer control how and when\ndevices were turned on and off seemed like a great solution. The problem is\nhow it was implemented\n\nTo implement SMI, Intel created a new interrupt pin on their CPU,\nappropriately named the SMI# pin. When this pin was asserted, (turned on,\nessentially) the system would halt everything it was doing, save state, and\ntransition into System Management Mode (SMM). SMM is essentially another\nentire operating mode for the CPU, just like Real Mode, V86 Mode, and\nProtected Mode. The big difference here is that this mode can't be signaled\nfrom software, and everything that happens is 100% transparent to software.\nOnce the system enters into SMM mode, it's truly like time stands still.\nEverything you know about the state of the system can change from underneath\nyou from one instruction to the next. This includes every part of the OS,\nwhich generally assumes, (rightfully so) that things will always be a\ncertain way until it says otherwise.\n\n\n\n-\-\-\-\- Original Message -\-\-\-\-\nFrom: "Go Tyler" <[email][/email]>\nNewsgroups: alt.comp.periphs.mainboard.asus\nSent: Wednesday, December 14, 2005 7:34 PM\nSubject: What is SMI pins on the MOBO panel?