                              EPSON AMERICA, INC.
                           Product Support Bulletin


                Subject:16MB of RAM and the Equity 386/20 Computer


Date:  8/17/89                                                  PSB No:  S-0095
Page:  1 of 1                                                   Originator: GLW


Purpose:

   The purpose of this bulletin is to explain a potential problem when
   installing 16MB of RAM using 16 1MB SIMM modules.  The SETUP program
   versions 5.1 and 5.2 allow an expansion memory setting that causes the
   following error to be displayed:

          FC0000 6DDB 201 - Memory error
                          - Parity check 1
          164 - Memory size error
                 (Run SETUP in DIAGNOSTICS)

Setup Information:

   When entering information into the SETUP program, use the following
   values:

          640K    Main
          15104K  Expansion

Memory Map:

   Address        Range          Size      Use
   000000-09FFFF  0-640K         640K      RAM-Main
   0A0000-0FFFFF  640K-1M        384K      Reserved
   100000-FBFFFF  1M-15.75M      15104K    RAM-Expansion
   FC0000-FFFFFF  15.75M-16M     256K      Reserved

Explanation:

   The 384K of address space between 640K and 1M is reserved for system
   use (including the SHADOW RAM feature).  The 256K address space
   between 15.75M and 16M is also reserved for system use.  The 640K and
   15104K are combined into 15744K of total accessible RAM.
