Interesting...I think that free pascal interpreter was also with the book "Oh, Pascal". At least the name Dr. Pascal rings a bell. I still have the files disk for that book.

Some of the old websites have the old versions of MacPascal available. It will only run on system 6.0.8 or less, but it was great, because it has the system calls built into the program, so you could do all sorts of nifty graphics with very little work.

If you aren't already aware, Think Pascal 4.5 something is available free on the web. Have you visited Pascal Central on the web?