Not to prepare it. Only to enter a K-1 you would get from the S Corp return.
To prepare the 1120 S return, You need Turbo Tax Business.Itis a separate program from Home & Business.It is not available to do online or on a Mac.And it will not do your personal 1040 return.
I think Turbotax Business is available online now, but only the Live Assisted and Full Service options. For the DIY option, the Business program is still only available to install on a PC from a download or CD.