Hi, as the topic title says, I was wondering if anyone had any information on the details of ADL, the “Adventure Development Language” created by Ken Williams and used for the Sierra “Hi-Res Adventures”. (I know these are kind of the precursors of graphic adventures and not pure “interactive fiction” in the sense used on this site; I note, though, that the Hi-Res Adventures are listed on the Interactive Fiction Database, and the first, Mystery House, is up on the Interactive Fiction Archive, so hopefully they fall enough inside of this site’s bailiwick that my asking about them here isn’t off topic.)
Specifically, I was wondering if the details of the syntax and structure of the language were available anywhere—enough for someone to create a new game that used the same engine. ScummVM can run ADL games, so clearly someone has figured out the format, but despite fairly extensive searches online I’ve been unable to find anything useful. (It doesn’t help that “Adventure Development Language” is a generic enough name to make it hard to search for specific information on it.)
I do have a reason for asking about this; I’m starting a blog about game creation systems (well, not right away, but it should be launching some time in the next year—I’m trying to get some prep work done first). My intent is to go chronologically covering the various game creation systems and engines that have existed over the years, and trying if possible to make a game with each one. (I’m not sure how far I’ll ultimately get, but at least up through the 80s there are few enough such systems that a comprehensive approach may be doable.) ADL is one of the earliest game-creation systems/engines I’ve found (not the earliest, but within the first twenty or thirty), but of those early engines it’s one of those I’m having the most trouble finding detailed information about, second only to a really obscure system from 1979 called F. So if anyone could point me to where I might be able to find out more about ADL’s format, I’d really appreciate it.
(I’d ask about F, too, but that anyone here would know more about that is a huge long shot—right now all I know about F is what’s in this page about lost mainframe adventure games (I’ve sent an e-mail to the creator, who’s still alive and whose contact information can be found on the web, but not surprisingly I haven’t received a reply). But if anyone does know more I’d certainly be interested. I’d make a separate post about F, but, well, I’m new to this forum and though I’ve lurked a bit I’m not 100% sure of the etiquette here and I don’t want to spam the place with multiple posts.)
Thanks for any information anyone might have.