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AX = 121Dh DS:SI -> memory to add up CX = 0000h DX = limit
Return:
AL = byte which exceeded limit CX = number of bytes before limit exceeded DX = remainder after adding first CX bytes DS:SI -> byte beyond the one which exceeded the limit
Notes: Used by DOS to determine year or month given day count since 1980/1/1. Supported by DR DOS 5.0+
See Also: AX=121Ch
Category: DOS Kernel - Int 2Fh - D
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