1990s Weight Watchers Program

I lost a lot of weight back in the early 1990s using a Weight Watchers calculator that I can't find. It was based on a minimum, mid and top amounts of food a person could eat in 1 day/week. I chose the minimum. I remember I counted servings of proteins, fats, breads, fruits, water, etc. and NOT points. I remember there was also a place to enter in exercise. The calculator was white and, if I remember correctly, opened like a book. I didn't count grams or anything like that. It was servings. HELP! Thx much.