INT 15 - EISA SYSTEM ROM - CLEAR NONVOLATILE MEMORY (EISA CMOS)
AX = D802h
BH = EISA config utility major revision level
BL = EISA config utility minor revision level
Return: CF clear if successful
AH = 00h
CF set on error
AH = error code
84h error clearing CMOS
86h invalid BIOS-FW function call
88h config utility version not supported
Note:   call with AL=82h if using 32-bit CS addressing mode instead of 16-bit

See also: 15D803

15D802 - EISA SYSTEM ROM - CLEAR NONVOLATILE MEMORY (EISA CMOS)