INT 15 U - AMIAmerican Megatrends, Inc.(American Megatrends, Inc.) A hardware, software and firmware company founded in 1985. PCI BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. - GET CPU(Central Processing Unit) The microprocessor which executes programs on your computer. TYPE AND SPEED AX = DA92h Return: CF clear (successful) AL = CPU(Central Processing Unit) The microprocessor which executes programs on your computer. stepping (see also #00529 at INT 15/AH=C9h) AH = CPU(Central Processing Unit) The microprocessor which executes programs on your computer. model BL = CPU(Central Processing Unit) The microprocessor which executes programs on your computer. family (05h = Pentium, etc.) CX = external clock speed in MHz (BCD(Binary Coded Decimal) A method of data storage where two decimal digits are stored in each byte, one in the upper four bits and the other in the lower four bits. Since only the values 0 through 9 are used in each half of a byte, BCD values can be read as decimal numbers on a hexadecimal display of memory or a file.) (0040h,0050h,0060h,0066h are possible return values on my Pentium with the Intel "Neptune" chipset) EAX high word destroyed Note: 90 MHz and faster Pentium CPUs can be configured to run at varying multiples of the external clock speed, i.e. a typical 90 MHz Pentium system will run the motherboard at 60 MHz (my 90 MHz Pentium returns 0060h in CX) SeeAlso: AH=C9h