Chapter 2 - Installation
12
S t e p 3 I n s t a l l C o p r o c e s s o r
S t e p 3 I n s t a l l C o p r o c e s s o r
The 80386 Baby Screamer LC motherboard supports the Weitek WTK3167, Intel 80387, and Cyrix
83D87 or other 387-
compatible coprocessors.
C h o o s i n g A C o p r o c e s s o r
C h o o s i n g A C o p r o c e s s o r
The coprocessor must operate at the same frequency as the system microprocessor. The following table lists math coprocessor
parts.
B o a r d
B o a r d
F r e q u e n c y
F r e q u e n c y
I n t e l
I n t e l
P a r t N o .
P a r t N o .
C y r i x
C y r i x
P a r t N o .
P a r t N o .
W e i t e k P a r t N o .
W e i t e k P a r t N o .
25 MHz
80387-25
83D87-25
WTL3167-025
33 MHz
80387-33
83D87-33
WTL3167-033
I n s t a l l i n g t h e W T K 3 1 6 7 o n t h e M o t h e r b o a r d
I n s t a l l i n g t h e W T K 3 1 6 7 o n t h e M o t h e r b o a r d
U22 is the empty 121-pin PGA socket between the cache memory and microprocessor. The socket is labeled
Weitek
. Pin 1 of the
socket is near the chamfered edge of the socket. This corner corresponds to pin 1 of the Weitek also identified by a chamfered edge
(
on the bottom of the coprocessor
).
Check for bent pins on the coprocessor. Gently straighten any bent pins using a pair of pliers. Install the component into the socket.
Align the pins and press the Weitek coprocessor firmly into the socket, making sure that pin 1 of the Weitek coprocessor is aligned
with pin 1 of socket U22. See the following figure. Make sure that the Weitek coprocessor option in the Advanced CMOS Setup is
enabled. The Weitek math coprocessor will not work unless it is enabled in BIOS Setup. See the Advanced CMOS Setup Section on
page 39.
