A387DX View Datasheet(PDF) - Intel

Part Name

Description

MFG CO.

A387DX

MATH COPROCESSOR

Intel 

Intel387TM DX MATH COPROCESSOR

Table 2 1 Intel387TM DX MCP Data Type Representation in Memory

NOTES

(1) S e Sign bit (0 e positive 1 e negative)

(2) dn e Decimal digit (two per byte)

(3) X e Bits have no significance Intel387TM DX MCP ignores when loading zeros when storing

(4)U e Position of implicit binary point

(5) I e Integer bit of significand stored in temporary real implicit in single and double precision

(6) Exponent Bias (normalized values)

Single 127 (7FH)

Double 1023 (3FFH)

Extended Real 16383 (3FFFH)

(7) Packed BCD (b1)S (D17 D0)

(8) Real (b1)S (2E-BIAS) (F0 F1 )

240448 – 2

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