Best I can do is describe this code/listing:

It created a few lists of words (IIRC these lists were adjectives, nouns, verbs?), and in the main loop it kept track of which list it had just taken a word from in order to decide what to pick next — e.g. if it had just picked an adjective then was allowed to pick either another adjective or go onto a noun, if it had just picked a noun then it could end the sentence or it could go on to a verb — and it would pick a random word from whichever list.

This either fit entirely on one screen, or very close to that — I was little, I would have made a syntax error if it had been much longer.

(Perhaps it will turn out to be my family's user manual wasn't even the official one, though I do remember it being a thick blue thing which matches the pictures I've seen online).