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AX = 121Ch DS:SI -> start of memory to checksum CX = number of bytes DX = initial checksum SS = DOS DS (must be using a DOS internal stack)
Return:
AX, CX destroyed DX = checksum DS:SI -> first byte after checksummed range
Notes: Used by DOS to determine day count since 1980/1/1 given a date. Supported by DR DOS 5.0+
See Also: AX=121Dh
Category: DOS Kernel - Int 2Fh - D
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