The owner of a memory block is a 16-bit word. It is set to zero to indicate a free block. A non-zero value is normally the PID (process identifier) of the owner, that is, the address of the PSP of the owning process. This is important when a process terminates, because DOS automatically frees all memory blocks that the process owned. Note that DOS performs no validity checks on the owner; any process can free or resize any block, regardless of who owns it, and the MCB owner need not be a valid PID.
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Zaddy is an unfinished language for describing compilers. I shared notes on its design. Its full title is "META Restricted ACE Zaddy". By "ACE" I mean that Zaddy ought to match terms with respect to Associative and Commutative operators, as well as Equality of distinct terms. E-matching is a well-studied-enough problem that there is literature on it, but there is little progress on full ACE-matching. Previously, on Lobsters, I explained that finishing Zaddy is not something I would expect from a bot or from another human. But under the relaxed rules, why not give it a try?