To Whom it may interest,
I downloaded MacGambit-C 3.0 a short time ago for my Mac OS. 9.1 and it works fine. I'm learning Scheme from the Dybvig book with aid from the UCB Scheme folder. I also downloaded MacGambit 2.2.2. I had version 2.2.2 running on Mac OS 9.1 before I had a hard disk failure. I tried the complied interpreter on the download but at startup I got an "illegal instruction error". so I tried compiling it myself. It turned out that it had to be updated to my later version of the CodeWarrior compiler. I tried that and then everything went wrong.
As I said MG-C 3.0 works all right on my Mac OS 9.1 but as far as I know version 2.2.2 is the last that ran the drawing-demo1.scm and graphics from "Concrete Abstractions" on the classic Mac and I just wanted to play with the graphics.
I hope someone has this rare old OS 9.1 version of 2.2.2 and I can download it.
Yours,
Frank Gizinski Racine, Wisconsin