The first steps in debugging the camera were a detour, but I still found some useful stuff.
The entirety of the memory managed by DOS is described by a chain of MCBs. The start of the chain is located through the arena_head variable within DOS. Each memory block is immediately followed by the MCB describing the next block, except for the last block in the chain (with the ‘Z’ signature) which has no follower.
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Виктория Кондратьева (Редактор отдела «Мир»)
(Some spoilers below but no major reveals.)