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2015-12-04
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EPSON AMERICA, INC.
Product Support Bulletin
Subject: Equity LT-286e Numeric Co-processor Information Change
Date: 9/11/89 PSB No.: S-0099
Page: 1 of 1 Originator: MWT
The final specifications for the Equity LT-286e have changed in
one particular.
Initial documentation indicated that the Intel 80C287-A-12
CMOS-type numeric co-processor (NPX) should be used. Due to
Intel design considerations, this turns out to be in error.
The 80C287-A-12 requires additional power and ground pin
connections as opposed to the NMOS version. This requires
special connections to the socket that were not part of the
LT-286e design. Intel clearly warns that installing the
80C287-A-12 in a computer not meeting these new specifications
can cause damage to the NPX chip and/or the computer.
DO NOT ATTEMPT TO INSTALL THE 80C287-A-12 IN THE EQUITY LT-286e!
The final specification for the NPX to be used in the LT-286e is
the 80287-8, NMOS-type. The Service Support Plan and Service
Manual are being revised to reflect this change.