As this thread has wargamers on it, maybe someone can help me remember a particular book? In around 1985 (which is why I cannot remember it well enough) I borr

As this thread has wargamers on it, maybe someone can help me remember a particular book? In around 1985 (which is why I cannot remember it well enough) I borrowed a book from a local UK library specifically on writing (not playing) computer wargames. A few such books exist/existed but I remember this one specifically. It was paperback, about half an inch think, and it went into great detail on how to pack army and map information into bytes (2 bits for one thing, 1 for another etc). It had the usual algorithms for movement, terrain, distance-based (not line of sight) fog of war etc., but the thing that stuck out as being different enough that it might be memorable was the bit-level compression of data. It may have been using Pascal, though I'm even more hazy on that as it was 40 years ago. It was definitely slightly more academical than introductory. I've looked through a lot of the usual books from back then (not just the mainstream Donald Featherstone stuff), tried the library (but they are now a motorbike dealership), and even contacted a few publishers directly (they were nice enough to respond but with a 'not us'). Anyway, I appreciate this is vague but if anyone remembers it I'd be grateful.