Back to the topic of original AGI interpreter code fragments, I have noticed that one of the KQ3 original game disks also has fragments of AGI interpreter source code on it. Nowhere near as much as the SQ2 2.0D 720K disk 1 though, but it is a fairly continuous run of several files, mainly ASM code. I can see a couple of overlaps, e.g. the IOBJSBRS.ASM file, but apart from that, it is mostly new, and mostly Hercules graphics related ASM code (e.g. HOBJSBRS.ASM, HGRAPHX.ASM and HJMPTBL.ASM), which I think was missing from the code extracted from the SQ2 disk.
Kind of makes me want to complete an exhaustive search of all the remaining permutations of original AGI game disks. This would have to include not only every AGI game, but also every released version of every AGI game, including all disks of both the 360K and 720K versions of each game version. Not sure how many disks that will end up being, but probably quite a few I would imagine.
(Edit: Not sure if this concept of deleted file content remaining behind on the master floppy disk applies to other systems, such as Amiga, Atari, Apple, etc, but might be worth looking there are well)