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IBM 5150 - Operand Summary; Second Instruction Byte Summary

IBM 5150
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Operand
Summary
"reg
field Bit Assignments:
16-Bit[w=
1J
8-Bit
[w=OJ
Segment
000
AX
000
AL
00
ES
001
CX
001 CL
01
CS
010
OX
010
OL
10
SS
011
BX
011
BL
11
OS
100
SP
100
AH
101
BP
101
CH
110
SI
110
OH
111
01
111
BH
Second
Instruction
Byte
Summary
I
mod
I
xxx
rim
mod
Displacement
00
OISP =
0*,
disp-Iow
and disp-high are absent
01
OISP =disp-Iow sign-extended
to
15-bits, disp-high is absent
10
DISP = disp-high: disp-Iow
11
rim
is treated
as
a
"reg"
field
MF
=
Memory
format
rim
Operand Address
00
-
32-bit
Real
000
(BX) + (SI) + OISP
01 -
32-bit
Integer
001
(BX) + (01) + OISP
10
-
54-bit
Real
010
(BP)
+ (SI) + OISP
11
-
54-bit
Integer
011
(BP)
+ (01) + OISP
100
(SI) + OISP
101
(01) + DISP
110
(BP)
+ OISP*
111 (BX)
+ OISP
OISP
follows
2nd
byte
of
instruction
(before data
if
required).
*except
if
mod =
00
and
rim
=
110
then
EA
=disp-high: disp-Iow.
6-4
Instruction
Set

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