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Int 15 Fn D803 - Eisa System ROM - Write Nonvolatile Memory [X]
AX = D803h
CX = length of data structure (0000h = empty slot)
includes two bytes for config file checksum
DS:SI -> configuration data
Return: CF clear if successful
AH = 00h
CF set on error
AH = error code
84h error clearing CMOS
85h EISA CMOS is full
86h invalid BIOS-FW function call
Note: call with AL=83h if using 32-bit CS addressing mode instead of 16-bit
See Also: AX=D802h
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