Logical Group - HP 9835A Programming Manual

The Processor and the Operating System
41
Logical Group
This group of instructions performs logical (Boolean) operations upon the contents of an
arithmetic accumulator (on A or B register). Logical "and" and "or" operations are available,
along with complementing and clearing operations.
Instruction
., ,., . . . . {address} [;! :I]
. J. ():
: : ! {address} [,! :1]
...... :y!
1····~
Description
Logical "and" operation. The contents of the A register are
compared bit by bit, with the contents of the specified loca-
tion. For each bit-comparison a 1 results if both bits are 1 's, a
o
results otherwise. The 16-bit result is left in A .
Logical "inclusive or" operation. The contents of the A regis-
ter are compared, bit by bit, with the contents of the specified
location. For each bit-comparison, a 0 results if both bits are
O's, a 1 otherwise. The 16-bit result is left in A.
Performs a one's complement of the A register (i. e., bit-by-bit
inversion of all 16 bits).
Performs a one's complement of the B register (i.e., bit-by-bit
inversion of all 16 bits).
Clears register A. This instruction is identical to SAR 16.
Clears register B. This instruction is identical to SBR 16.