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Functionality of the Computer Units
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2s-complement accumulator adder addition arithmetic unit assignment assume binary binary-1 signal bit positions called carry look-ahead carry look-ahead adder Chapter chip clock gates clock period clock pulse occurs column complement control signals control store control unit decoder device diagram DIGITAC EBCDIC edge-triggered encoder example flip-flop Gray code half-adder input signal instruction fetch instruction register inverter inverter function jump Karnaugh map leftmost logic function machine maximum microinstruction microprogrammed minimum delay minterms most-significant negative number number of bits octal operand address operation code output line output of nand output signal pattern performed phase phase-A register Pi Pi placed positive-logic problem punched reader represented reset right-shift serial shift shown in Fig sign bit step counter stored subroutine subsquares subtraction switch symbol tion truth table variables voltage wire word write wxyz