Intel 80C188XL - Manual (Page 293)

MATH COPROCESSING
11-8
Figure 11-1. 80C187-Supported Data Types
Increasing Significance
Word
Integer
Packed
Decimal
Short
Real
Temporary
Real
(Two's Complement)
Short
Integer
Long
Integer
Long
Real
S
0
Magnitude
15
S
0 31
Magnitude (Two's Complement)
(Two's
Complement)
S
0 63
Magnitude
72 79
Magnitude
S
0
Biased
Exponent
Significand
I
31 23
S
0 63 52
I
Biased
Exponent
Significand
S
I
79 64 63 0
Biased
Exponent
Significand
S X
d
17
d
16
d
15
d
14
d
13
d
12
d
11
d
10
d
9
d
8
d
7
d
6
d
5
d
4
d
3
d
2
d
1
d
0
NOTES:
S = Sign bit (0 = positive, 1 = negative)
d
n
= Decimal digit (two per byte)
X = Bits have no significance; 80C187 ignores when loading, zeros when storing.
= Position of implicit binary point
I = Integer bit of significand; stored in temporary real, implicit in short and long real
Exponent Bias (normalized values):
Short Real: 127 (7FH)
Long Real: 1023 (3FFH)
Temporary Real: 16383 (FFFH)
A1257-0A