User's Manual

THE 80286 INSTRUCTION SET
TEST -Logical Compare
Opcode
84 /r
84 /r
85 /r
85 /r
A8 db
A9 dw
F6 /0 db
F7 /0 dw
Instruction
TEST eb,rb
TEST rb,eb
TEST eW,rw
. TEST rw,ew
TEST AL,db
TEST AX,dw
TEST eb,db
TEST ew;dw
FLAGS MODIFIED
Clocks
2,mem=6
2,mem=6
2,mem=6
2,mem=6
3
3
3,mem=6
3,mem=6
Overflow=O, sign, zero, parity, carry=O
FLAGS UNDEFINED
Auxiliary carry
OPERATION
Description
AND byte register into EA byte for flags only
AND EA byte into byte.register
for flags only
AND word register into EA word
for flags only
AND EA word into word register
for flags only
AND immediate byte into AL
for flags only
AND immediate word into
AX for flags only
AND immediate byte into EA byte for flags only
AND immediate word into EA word
for flags
.only
TEST computes the bit-wise logical AND of the two operands given. Each bit of the result is 1 if both
of the corresponding bits of the operands are
1; each bit is 0 otherwise. The result of the operation is
discarded; only the flags are modified.
PROTECTED MODE EXCEPTIONS
#GP(O) for an illegal memory operand effective address in the CS, DS, or ES segments; #SS(O) for an
illegal address in the
SS segment.
REAL ADDRESS MODE EXCEPTIONS
!
Interrupt 13 for a word operand at offset OFFFFH.
8.-110