Too many to even begin to list here, forget describing the architectures.

Patterns of enterprise application architectures are used for something. They are used to form pillars of an enterprise architectures. Pillars of an enterprise architectures are patterns of enterprise application architectures.

The "arithmetic logic unit" performs these operations in classical standard microprocessor architectures

Intel has actually manufactured several incompatible architectures. The 4004, 8008, and 8080 are all incompatible. The 8086, 8088, 80286, 80386, 80486, Pentium (II, III, 4), and Core (2) are all backwards-compatible processors classified as "x86." Intel also created the i860 and IA-64 (Itanium) architectures.

the purpose of buffers in computer architectures i dont know