You could try JED. You can see a screenshot here:
http://www.jedsoft.org/images/jed1.png
I haven't used that, but the editor in Midnight Commander or just PICO. Pico is easy to use.
Did a search on google.com and found a referal to an IDE called: Anjuta. Never heard of it, but it's supposedly simple, good and easy to use.
If you search google.com for: Linux Pascal IDE
you should get some relevant info.
-Geir O.