IBM XT 5160 User Manual

AF Auxiliary Carry - BCD
CF Carry Flag
PF Parity Flag
SF Sign Flag
ZF Zero Flag
} 8080
Flags
DF: Direction Flag }
IF:
Interrupt Enable Flag 8088 Flags
OF: Overflow Flag (CF + SF)
TF:
Trap-Single Step Flag
Operand Summary
reg Field Bit Assignments
16-Bit [w =
1]
8-B it [w = 0] Segment
000
AX
000
AL
00 ES
001 CX
001 CL
01 CS
010
DX
010
DL
10 SS
all
BX all BL
11 DS
100 SP 100
AH
101
BP
101 CH
110 SI 110 DH
111 DI
111 BH
Second Instruction Byte Summary
~r/m
mod Displacement
00 DISP = 0*, disp-low and disp-high are absent
01 DISP = disp-low sign-extended to 16-bits, disp-high is absent
10 DISP = disp-high: di~p-1Rw .
11 rim is treated as a reg field
DISP follows 2nd byte of instruction (before data if required)
*except if mod=OO and r/m-110 then EA=disp-high: disp-low.
6-4 Instruction Set

IBM XT 5160 Specifications

General

Brand	IBM
Model	XT 5160
Category	Desktop
Language	English