-Shows the amount of dynamic core in use, broken down into used and
-free core, and address of the last location in the heap.
-With an argument shows each used and free block on the internal dynamic
-memory chain indicating its address, size, and whether it is used or free.
-This is a debugging command and may not work in production versions of the
-shell; it requires a modified version of the system memory allocator.
+Shows the amount of dynamic memory acquired, broken down into used and
+free memory.
+With an argument shows the number of free and used blocks in each size
+category. The categories start at size 8 and double at each step.
+This command's output may vary across system types, since
+systems other than the VAX may use a different memory allocator.