Specifications

EPSON AMERICA, INC.
Product Support Bulletin
Subject: Equity 386/20 Using Memory Above 2MB
Date: 10/09/92
PSB No: S-0123A
Page(s): 1 of 1
Originator: JDB/KAS
The purpose of this bulletin is to provide information on a problem which may occur
when using more than 2MB of memory in the Equity 386/20 computer.
When expanding memory above 2MB for memory intensive applications
(Networking software, AUTOCAD, LOTUS 1-2-3), insure that ROM BIOS version
1.11 or higher and the corresponding CHIPS set are being used, and a Revision 02
CHET-RM board is installed.
If the Equity 386/20 is to be used in the applications mentioned above and it does
not have the component versions described above, they can be ordered with the
following part numbers:
ROM BIOS (current)
Y184802004 (CHE-B5) Lot. 9B
(Rel. 2.16)
Y184801004 (CHE-A5) Lot. 9C
CHIP S Set
X403823021 (7L) Memory Controller
X403822061 (9F) Int. Peripheral Controller
CHET-RM Board
Y184202100 (02 rev #)
Reference Disk
Required for User-Defined drive types and
types 59-63 and the use of 1.44MB FDD as
drive A:. (When using BIOS rel 2.10 or
higher). Available on the Epson RBBS.
The problem does not occur in units that have this configuration.
NOTE
The chips in location 7L and 9F can be identified by the numbers printed on the top
of the chips, these are the old and new numbers:
LOCATION
TYPE
7L
OLD
7L NEW
9F OLD
9F
NEW
CHIP NUMBER
P82C302-20
P82C302C
P82C206F-1
P82C206H
PART NUMBER
X403823020
X403823021
X403822060
X403822061
REFERENCE:
Engineering Change Notice EQ386/20-001A