Control Data Cyber 170 State Hardware Reference Manual page 147

PP
Logical lnstructions
PP Logical Instructions
The logical instructions (table 4-18) perform operations with one operand as
the PP A register contents, and the other as specified by the instruction. The
result replaces the origiml contents of
A .
Table 4-18. PP Logical Instructions
Opcode Format Instruction Mnemonic
10 d Shift d
SHN d
13 d Selective clear d SCN d
1 1 d Logical difference d
L M N d
23
d m Logical difference dm LMC
m,d
33 d Logical difference (d) L M D d
43 d Logical difference
(
(d)
)
LMI
d
53 dm Logical difference ( m + ( d ) ) LMM m,d
12 d
Logical product d
LPN d
22 dm Logical product dm
LPC m,d
Shift
10d Shift d SHN d
This instruction shifts the content of the A register right or left d places.
If d is positive (00 through 3 7 ) ,
the shift is left circular. If d is negative
(40 through 771, the shift is right circular (end-off with no sign extension).
Thus,
d
equal to 06 requires a left-shift of s i x places; d equal to 71 requires
a right-shift of six places.
Selective Clear
13d Selective clear d
SCN d
This instruction clears any of the lower 6 bits of the A register where
corresponding bits of d are 1 . The upper 12 bits of A are not altered.