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A technique for constructing a processor from modules, each of which processes one bit-field or "slice" of an operand. Bit slice processors usually consist of an alu of 1, 2, 4 or 8 bits and control lines (including carry or overflow signals usually internal to the cpu). For example, two 4-bit ALUs could be arranged side by side, with control lines between them, to form an 8-bit ALU. A sequencer executes a program to provide data and control signals.
The amd am2901 is an example.