JS
Operand:
label
Short Jump if Signed (if negative).
Set by CMP, SUB, ADD, TEST, AND, OR, XOR instructions.
Algorithm:
if SF = 1 then jump
Example:
include 'emu8086.inc'
#make_COM#
ORG 100h
MOV AL, 10000000b ; AL = -128
OR AL, 0 ; just set flags.
JS label1
PRINT 'not signed.'
JMP exit
label1:
PRINT 'signed.'
exit:
RET
Flags:
C Z S O P A
unchanged