Intel 80286 User Manual

OVERVIEW OF NUMERIC PROCESSING
__ INCREASING SIGNIFICANCE
WORD INTEGER lSi MAGNITUDE I
15 0
(TWO'S
COMPLEMENT)
SHORT INTEGER
I I MAGNITUDE (TWO'S
L . ..1."-- __________ ...... COMPLEMENT)
31
II
I
(TWO'S
LONG INTEGER
LS..I"-- __ "-- _______ M_A_G_N_IT_U_D_E _________ -.I COMPLEMENT)
U 0
MAGNITUDE
PACKED DECIMAL
d17 d
'
6 d
'5
d
'
4 d
'3
d
'2
d
11
d10 d g dB d
7
d6 d
5
d
4
d
3
d
2
d
,
dO
79 72
SHORT REAL
LONG REAL S
63
BIASED
EXPONENT
SIGNIFICAND
o
1 !
TEMPORARY REAL
LIS..lI"-- __ __ _________ S_IG_N_1_F_IC_A_N_D ________
79 0
NOTES:
5 Sign bit (0 = positive, 1 negative)
dn Decimal digit (two per byte)
X Bits have no significance; 80287 Ignores when loading, zeros when storing.
• Position of implicit binary point
1 Integer bit of signi1icand: stored
in temporary real, implicit (always 1) in short and long real
Exponent Bias (normalized values):
Short Real: .127 (7FH)
Long Real: 1023 (3FFH)
Temporary Real:. 16383 (3FFFH)
Figure 1-9. Data Formats
1-16
G30108
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Intel 80286 Specifications

General

Processor Type	Microprocessor
Clock Speed	6 MHz to 25 MHz
Transistor Count	134, 000
Addressable Memory	16 MB
Instruction Set	x86
Architecture	x86
Data Bus Width	16-bit
Address Bus Width	24-bit
Operating Modes	Real mode, Protected mode
Process Technology	1.5 µm
Voltage	5V
Introduced	1982
Package	68-pin PGA