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A blog post doing 'Unix archaeology' on how early Unix versions (V4, 1973) handled memory allocation, from a primitive linear allocator using sbrk() to Dennis Ritchie's malloc()/mfree() map-based precursor in /usr/sys/dmr/malloc.c.
The author hosted an interactive workshop on UNIX V4 at the Low Resource Computing 2026 event, teaching software development using the recovered 1974 system with the ed text editor and multi-terminal setup.