The signature byte is ‘M’ for all memory blocks except the last one, with the last block using a ‘Z’ signature. Perhaps ‘M’ stands for “memory” and ‘Z’ for “last” (block), or perhaps MZ are the initials of Mark Zbikowski, one of the core developers of DOS 2.0.
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Industrial Organization
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The MCB by necessity takes up an entire paragraph, even though only 5 bytes were initially used; the following is an excerpt from MS-DOS 2.11 DOSSYM.ASM: