LIBRARY OF THE 
 
 UNIVERSITY OF ILLINOIS 
 
 AT URBANA-CHAMPAICN 
 
 510.84 
 
 Coi 
 
Digitized by the Internet Archive 
 in 2013 
 
 http://archive.org/details/revisedordercode38nash 
 

 INT 
 
 
 FEBRUARY 4* 195.3 
 

 . 
 
 
 ORDER 
 
 lo Introduction „ The Univej of Illino: 3 digital computer 
 
 is a machine with a register capacity of hp binary digits and an electro- 
 static memory which can hoi: UO-digit words. The arithmetic unit 
 handles 39 binary digits «n, works ir. '!,£ x < 1, and uses 
 aentation wit 
 There are four reg 
 a RU 
 bo R, 
 Co E 
 
 » 
 o each wo 
 
 idsh between 
 
 memory to R_ 9 the 
 
 n the right hand one* 
 
 Urol transfer ordei 
 
 the arit 
 
 Llows„ 
 

 gendp 
 sura, 
 pi and 39 most 
 
 I go product digits, 
 dividend 
 
 
 an 
 
 
 The Makeup oj 
 ction ! 
 its and the addrea 
 
 The address digits u 
 for other purposes if no Terence :; 
 
 For reasons assoi. 
 for input and output ix> the ter it 
 
 •>r base 16 number system In ystem c 
 
 used in place of four bii 
 be represented by 2 sexadec 
 represent the nurcbe 13 $ V 
 
 K 9 S, N, J, F and L respc >r exa 
 
 0111 1101 would be written 
 
 The two sexadecimal : 
 A digit specifies the tyj>e - 
 of that typeo 
 
 3° Order Typ es There are 13 types of 
 shown in Table 1 
 
 
 o 
 1 
 
 2 
 3 
 h 
 
 6 
 7 
 
 le 1c 
 
 1 
 
 Left Shift 
 
 ft 
 One ->1 Transfer 
 
 ional 
 
 Memory to Quotient Register 
 
8 
 
 
 
 9 
 
 
 Letter Output 
 
 S 
 
 
 ition frc 
 
 J 
 
 
 Tt 
 
 L 
 
 
 1t5.cn 
 
 Order Variations 
 
 The 
 
 
 quite large, and it What we 
 
 shall do is to show hr to give a list 
 of the more common and useful onas 
 
 The four binary di bhe B digit are given 
 in Table 2 C There are, of course, 16 possible combinations of these digitsj 
 
 but not all of them are used and, indeed, will cause t 
 machine to do unwanted operations and mi 
 
 Table 2 U OP 
 
 ROUNDOFF 
 
 ADD y 
 IM, 
 
 LEFT ORDER, 
 
 
 
 
 
 
 TAPE 
 
 
 
 The results obt 
 
 rtio Digit Bl Ii 
 is be/rinninr o; 
 
 The Dig it B8 I: 
 
 accumulator at the cn 
 
 >nnded multip] 
 

 c ° The Digit B2 
 
 and. J ordsrso The variat 
 
 do The Digi t BU This digit affects all o J 
 
 orders,. The variations are given in Table 
 
 5o The Address Digits of er The digits of 
 
 each order specify an address. This addre- s to a location 
 in the memory, but this is not ; ry f re 
 
 1023 o Table 3 lives the furicti 
 
 Tat 
 
 OPDEF. AE QN 
 
 0,1 Nmber of shifts, 0<n< 
 
 2,3 Memory location from r will 
 
 h Memory location at which stor 
 
 5 Memory location from wh' 
 
 register^ 
 
 6 Memory location of divi; 
 
 7 Memory Iocs 
 
 80^32 Number of Dinar y 
 
 be 
 
 pu r 
 S Address r 
 
 . 
 
 L 
 
 
 The drum 
 ,es on 
 one by 
 
 hand 
 
 

 
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 tore 
 
 ddres 
 
 
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 0* 
 
 43 
 
 
 
 
 CM *>• 
 
 co <; 
 
 1A 
 
 vO Q 
 
 
 
 
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 e/i 
 
 
 
 
 1 
 
drw 
 
 ^Machi 
 is machine 
 >nne< 
 
 ~ent B 
 )f more cottj 
 
 The loll- 
 
 
 
 
 
 
 b 
 do OE n, IEFT 
 >eat n times the o 
 
 ? f^ and b Q , b^, bg,« .„ 1 by a^ » 2 , e 
 -^ S ooo,b^g, b , 
 
 bo IB n, 
 
 speat n times the o] 
 it Ej and b Qj b^ b,. 
 
 »2»ooo*b^go The number n wiU 1 
 
 c„ 2B n, DNf 
 
 from memory location n a 
 depending upon B^ 
 
 do 3B n 9 C0 ; 
 order from memory location >se the 
 
 pair, depending upon B. If WR- /0, 
 
 Oo UB 
 hand rder, or t f a 
 
 
 
 bj 
 
 
 
 
 ■ 
 
 Location n 
 
 ■ 
 
f o % 
 
 go 6B R a + a" 39 (M 
 
 the rounded quotient least i 
 
 for the roundoff) and leavi 7 digits 32 and 
 
 BU must both \ 
 
 | ho ™ and R 2 , the 
 
 least significant 39 that m 
 
 - 1/2, then the (3d pre plication 
 
 B must be restricted to k 9 5 
 
 n * ra read i into and out of 
 
 , R x by a means similar to U ... input h left shifts are 
 
 performed and then the digits a^, 9Lyf9 a ad v the u 
 
 binary digits being input. This is repeated be a » 
 
 zero multiple of U and is interpreted modulo 6!, E \ 
 
 the digits a Q , a^ a 2 , and & 3 are read d ^ left re 
 
 performed as on input utput the c anc i & 
 9 the left shift order* 
 
 jo 93 n a IETTEE 1 Punch ,: 
 
 upon the address digits n* Tha center 
 
 right shifts viH be executed for each Kea 
 
 it possible to punch any of the- 32 comb 
 tape Three quantities are defined : 
 
 (1) The lei 
 out tapsc 
 
 (2) The rightmost a 
 
 ta; . 
 
 (3) The right. ;Q mjobep 
 b of ti^es that 
 
 of right shifts performed ;, as 
 
 n * 6k a ■»• U b 
 whore a determin 
 
al 
 
 
 
 
 IL 
 
 
 J\ 
 
 20 
 
 Jtt 
 
 
 n 
 
 An 
 
 
 n 
 
 
 
 
 n 
 
 
 n 
 n 
 
 
 
 
 
- 
 
 7<J Q 
 
 75 n 
 
 7U» 
 
 81 n 
 n 
 
 961 
 129 
 6hU 
 708 
 
 
 Pun 
 
 Same O] 
 ins ; 
 
 
 
 J n