Control Data 3100 Reference Manual page 91

Rev. B
23 18 1 7 16 1 5 14
02 \1 \ b m
b
=
index register designator
m
=
jump address
00
(Approximate execution time: 2.6 J,Lsec.)
I nstruction Description: If b = 1, 2 or 3, the respective index register is examined:
1.
If (B
b
)
= 00000, the jump test condition is not satisfied; RNI from address P
+
1.
2.
If (B
b
)
~
00000, the jump test condition is satisfied. One is subtracted from (B
b
);
jump to
address m and RNI.
Comments: If b=O, this is a no-operation instruction; RNI from address P
+
1. Indirect
addressing and jump address modification may
not
be used. If negative zero (77777) is ini-
tially loaded into B
b
,
the count will decrement through the entire range of numbers to
reach 00000 before the program will RNI from P
+
1.
RNI from
address P
+
1
Instruction in
F
No
Subtract one
from (B
b
)
Jump to address
'm';
RNI
7-34