IBM 5150 - Page 210

8088
Register Model
r-----------~----------~
Source Index
SI
AX: AH
AL
Accumulator
BX: BH BL
Base
CX: CH CL
Count
OX: DH DL
Data
General
SP
Stack Pointer
Register File
BP
I
Base Pointer
r-----------------------~
'-- ____________ ---' Destination Index
01
IP
FLAGSH FLAGSL
I
CS
Code Segment
OS
Data Segment
Segment
SS
Stack Segment
Register File
}
~----------~----------~
ES
Extra
Segment
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 X X, OF , OF 'IF 'TF , SF , ZF , X 'AF' X 'PF , X 'CF'
x = Don't Care
AF:
CF:
PF:
SF:
ZF:
OF:
IF:
OF:
TF:
Auxiliary Carry - BCD
Carry Flag
Parity Flag
Sign Flag
Zero Flag
Direction Flag (Strings)
Interrupt Enable Flag
Overflow Flag (CF $ SF)
Trap - Single Step Flag
}
8080 Flags
}
8088 Flags
Instruction Set 6-3