IBM 610 Manual Of Operation

Also see for 610: Technical overview and introduction

CONTROL DEVICES 4113 14 15 16 17 18 19 20 21 22Figure 45. Program for Summing NumbersFROM Data Tape with "Break-Out"FIXEDo o o oFigure 46. Fixed FiuBS (K 9, 10)AND Octal Hubs (K 1 1 , 1 2)Fixed Point (Figure 46)The pair of hubs labeled fixed, when one is con-nected to the Other, places the machine in fixed-pointmode, provided the switch fixed point on the key-board is in the control-panel position.Octal (Figure 46)The pair of hubs labeled octal, when one is con-nected to the other, makes the machine perform alloperations in octal arithmetic, provided the octalswitch is in control-panel position.If both the FIXED and ocT hubs are bridged, thecomputer operates in Fixed Point-Octal.DUP —o o 1^ oO o n DTYPE SUPo ^ o o "' oFigure 47. Duplicate Hubs (L 9, 10, 11, 12)The REL hub must be impulsed to release the 01register, because the preceding sequence of instruc-tion (i.e., 01 ENT dtr) has selected 01, cleared it, andprepared it to receive data. Because no data is actuallyentered, an artificial indication must be given to tellthe machine that data entry has been terminated. TheREL hub here serves precisely the same purpose thatthe sign on the end of a word of data normally serves.Once the register 01 is released on step B-13, and Aregister is selected, the contents (the desired sum)of the A register are read out.Dup (Figure 47)Under the set of dup hubs is a pair of hubs labeledP. When these two hubs are connected, informationread at the program tape reader will be duplicated atthe program tape punch, provided the dup switch onthe keyboard is in control-panel position.When the two hubs under dup labeled D are con-nected, material read at the data tape reader will beduplicated at the data tape punch, provided the dupswitch on the keyboard is in control-panel position.