@ Tenacious
What would you like to log?
There are some relatively simple projects for doing weather checking. You can do things like monitor door and window movement via switches. You can even be alerted via a motion detector with just on-off monitoring.
The fun comes in collecting the info and making it available in an intelligent way.
See
http://oww.sourceforge.net/ for some ideas. I know nothing of Blitz Basic however. I use ARexx, c, and python.
Amiga's parallel port is not particularly superior to any other "modern" parallel port. It does have some peculiarities, too. For on-off work, anything will work: serial or parallel, no matter how primitive.
ggw