IBM 5150 - 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
:==========~==========: ST AC 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 F LAGS to represent the file:
15 7 0
'X , X IX I X , OF , OF 'IF I TF I SF I ZF t X I AF IX I PF IX 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