Specifications

Product Support Bulletin
Subject:
Equity 386/20 Math Coprocessor (80387) Installation
Date: 01/04/90
PSB No: S-0082A
Page:
1 of 2
Originator: JD
4
The purpose of this bulletin is to provide information on installing the 80387
Coprocessor into an Equity 386/20.
Installation is as follows:
1.
2.
Locate coprocessor socket (location 4K) on CHET board.
Locate pin #1 on coprocessor chip (a dot on the upper side
of the chip indicates pin #1.
3.
Locate pin #1 on the coprocessor socket.
a. The silk screen on the board shows a diagonal cut on
one corner of the outline of the socket.
b. The center of the socket also has a corner diagonally
cut.
SILK SCREEN
This diagonally marked corner is pin #1.
4.
Insert the coprocessor by matching pin #1 of the chip to pin
#1 of the socket.