Design of a Computer: The Control Data 6600

60-bit word adder addition address register binary point block transfer CARRY Central Processor Central Storage channel chassis circuit circular buffer coefficient complement CPU registers DATA TRUNK Disk Storage Divide Unit dividend divisor double precision ECS Coupler example Exchange Jump execution exponent Extended Core Storage ferrite magnetic FETCH Fixed Add Unit floating point numbers functional unit INCR Increment Unit IND IND IND Index registers input operands input registers instruction stack instruction word ISSUE layer left shift load minor cycle module multiplicand Multiply Units nanoseconds normalized octal one's complement output partial product PPU storage PPU's program address pseudo-carry pseudo-sum Read Flag requires result register right shift Scoreboard secondary storage selected shift count shift network Shift Unit shown in Figure sign bit signal single precision six bits storage reference storage unit STORE Stunt Box subtraction Sum of Xj tion transistor Xj and Xk Xk to Xi zero