System V and Xenix compatibility

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In article <17032 at haddock.ima.isc.com> peterf at haddock.ima.isc.com (Peter Fischman) writes:
>
>	I recently came off a project that ported a DOS application,
>	Lotus 1-2-3 (you may have heard of it), to System V and Xenix.
>	We developed on 386/ix and used gcc and gmake.  The executable
>	runs on 386/ix, SCO Unix SysV.3.2, SCO Xenix386 2.3.2, AT&T
>	Unix SysV.3.2, and AT&T Unix SysV.4.  The only part of the code
>	that cares about the flavor of the OS is the video driver.  The
>	SCO video interface is different from 386/ix and AT&T.  That's
>	not much, in retrospect.

You tied directly into the video driver instead of using termcap or
terminfo?  How come?