250 _Machine-Independent Computer Programming_
TABLE XIII MACHINE LANGUAGE INSTRUCTION REPERTOIRE OF THE UNIVAC M-46O COUNTESS COMPUTER
FF	Function									 FF	Function
00	Illegal									  40	Enter logical product
01	Shift Q right							  41	Add logical product
02	Shift A right							  42	Subtract logical product
03	Shift AQ right							 43	Mask comparison
04	Compare									  44	Replace logical product
05	Shift Q left								45	Replace add logical product
06	Shift A left								46	Replace subtract logical product
07	Shift AQ left							  47	Store logical product
10	Enter Q register						  50	Selective set
11	Enter accumulator						 51	Selective complement
12	Enter B register						  52	Selective clear
13	Enter C register						  53	Substitute
14	Store Q register						  54	Replace selective set
15	Store accumulator						 55	Replace selective complement
16	Store B register						  56	Replace selective clear
17	Store C register						  57	Replace substitute
20	Add											60	Arithmetic jump
21	Subtract									 61	Manual jump
22	Multiply									 62	Input jump
23	Divide										63	Output jump
24	Add replace								 64	Arithmetic return jump
25	Subtract replace						  65	Manual return jump
26	Q add										 66	Input return jump
27	Q subtract								  67	Output return jump
30	Load A add Q								70	Initiate repeat
31	Load A subtract Q						 71	Index skip
32	Add Q and store							72	Index jump
33	Subtract Q and store					 73	Initiate input transfer
34	Replace add Q							  74	Initiate output transfer
35	Replace subtract Q						75	Initiate input buffer
36	Replace add one							76	Initiate output buffer
37	Replace subtract one					 77	Illegal.
_Here are MikeVanEmmerik's *guesses* for the j, k, and b fields:_ |*j = branch condition*|| |0| never| |1| ? | |2| | |3| | |4| equal to 0| |5| not equal to 0| |6| >= 0| |7| < 0| |*k = operand interpreter*|| | 0 | immediate yyyyy| | 1 | indirect memory m[m[yyyyy]] ?| | 2 | | | 3 | direct memory m[yyyyy]| | 4 | | | 5 | | | 6 | | | 7 | | |*b = index designator*|| |0| no index| |1| b | |2| | |3| | |4| | |5| | |6| | |7| | See also * http://ed-thelen.org/comp-hist/UNIVAC-M-640.html * http://encyclopedia.thefreedictionary.com/Univac%20M-460 CategoryDecompilation