IBM 5150 Hardware Reference Manual page 277

8088
REGISTER MODEL
AX:
AH Al ACCUMULATOR
BX:
BH
Bl
BASE
W
..J
CX: CH
CL COUNT
u..
OX: DH
DL DATA
..Ja:
«W
a: I-­
SP
STACK POINTER
W~
ZC!l
BP BASE POINTER
ww
C!la:
SI
I
~====================~
SOU RCE IN DEX
01
DESTINATION INDEX
I
~============~
I
IP
I
I-------.----------lil
NSTRU CTI ON POI NTE R
FLAGSH
FLAGSL . STATUS FLAGS
~===============~====:
CS CODE SEGMENT }
~
OS
DATA SEGMENT
I--
~
SS
:==========~==========:
STAC K SE G M ENT
~ ~
ES
EXTRA SEGMENT
Cl)a:
L-________
~~
t
Instructions which reference the flag register file as a 16-bit object
use the symbol FLAGS to represent the file:
15 7 0
'X , X
I
X
I
X , OF , OF 'IF
I
TF
I
SF
I
ZF
t
X
I
AF
I
X
I
PF
I
X
I
CF ,
X
=
Don't Care
AF: AUXILIARY CARRY - BCD }
CF: CARRY FLAG
PF: PARITY FLAG 8080 FLAGS
SF: SIGN FLAG
ZF: ZERO FLAG
OF: DIRECTION FLAG (STRINGS)}
IF: INTERRUPT ENABLE FLAG 8088 FLAGS
OF: OVERFLOW FLAG (CF E8 SF)
TF: TRAP - SINGLE STEP FLAG
B-2