CONTENTS OF DECREMENT PART OF REGISTER
\kˈɒntɛnts ɒv dˈɛkɹɪmənt pˈɑːt ɒv ɹˈɛd͡ʒɪstə], \kˈɒntɛnts ɒv dˈɛkɹɪmənt pˈɑːt ɒv ɹˈɛdʒɪstə], \k_ˈɒ_n_t_ɛ_n_t_s ɒ_v d_ˈɛ_k_ɹ_ɪ_m_ə_n_t p_ˈɑː_t ɒ_v ɹ_ˈɛ_dʒ_ɪ_s_t_ə]\
Definitions of CONTENTS OF DECREMENT PART OF REGISTER
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(cdr) /ku'dr/ or /kuh'dr/ The LISP operationthat returns the right-hand node of a binary tree structure.In the typical case where the tree is used to store a list,the cdr is the tail of the list, i.e. all but the firstelement.The instruction format of the IBM 7090 that hosted theoriginal LISP implementation featured two 15-bit fields calledthe "address" and "decrement" parts. The term "cdr" wasoriginally "Contents of Decrement part of Register".Similarly, "car" stood for "Contents of Address part ofRegister".
By Denis Howe
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