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Int B3 Fn 70 - Zipkey - Get Version [U]
AH = 70h
Return: AH = major version
AL = minor version
CL = number of states and territories in current database
DH = year of current database - 1900
DL = month of current database's file date
Program: ZIPKEY is a resident ZIPCODE database by Eric Isaacson
Note: if installed, the string "ZIPKEY" is present at offset 75h in the
interrupt handler's segment, and the byte at 7Bh contains the API
version number (00h for v1.x, 01h for v2.0)
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