Turbo Pascal is, or at least until some time ago, was, also available from the Borland/Codegear/Embarcadero (hat tip to often useless or destructive M&A) Museum (along with other historical software from them, like Turbo C and so on). I had downloaded TP and TC from the Museum and tried them out a bit again some time ago, for old times' sake. Worked okay, IIRC, but I may have only used them for CLI work, not for BGI graphics. Worth a try though, for BGI, even on Windows, without installing DOSBox.

Update: Here is the link to the Museum:

http://edn.embarcadero.com/museum/antiquesoftware