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LISP I Programmer's Manual - Software Preservation Group

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25207 052567 05257025210 000000 00000125211 052566 05264425212 oooooo 05256525213 000000 000001or, in list formIn this case, the constant 1 is tagged both as an integerINT of value 1, and as a constant which when evaluated (APVAL)yields the value 1.6,3 The Free-Storage List and the Garbage CollectorAt any given time only a part of the memory reserved forlist structures will actually be in use for storing S-expressions.The remaining registers are arranged in a single list called thefree-storage - list. A certain register, FREE, in the programcontains the location of the first register in this list. Whena word is required to form some additional list structure, thefirst word on the - free-storage list is taken and the number inregister FREE is changed to become the location of the secondword on the free storage list. No provision need be made for

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