INT 1A - CheckIt Year 2000 Fix v2.06 - INSTALLATION CHECK
AH = 04h
CX = 4555h ('EU')
DX = 524Fh ('RO')
BX = 0000h
Return: BX <> 0000h if installed
BX = major/minor/sub version (2068h = version 2.06.8)
Program: CheckIt is a TSR by Eurosoft (UK) Ltd. which corrects some Y2K-related
RTC bugs