Epson Equity II Product Support Bulletin page 29

PSB NO.: S-0057
SUBJECT:
EQUITY II
The purpose of this bulletin is to provide information on
the various revision levels of the Equity
The attached table describes the differences found in the
revisions of
beginning with
the latest
Note: The Y147201000 (02) MCY board is an update of the
version with many improvements of the latest MCY board.
Some of the major differences between the earlier versions
which were improved in the latest versions are:
* Third party IBM compatible keyboard support - The early
revision boards did not have jumpers to select non-Epson
keyboards.
* Optional RAM board support - The earliest revision MCY
board did not support optional RAM boards (no dynamic
memory refresh).
* 640KB RAM on MCY board - The
had 512KB RAM installed on the MCY board and required-a
128KB
RAM board (MCY-RM) which plugged into the MCY board.
The later boards have 640KB installed on the MCY board.
* Serial interface - On the earlier boards, the built-in
serial port would not operate reliably above 1200 baud.
An optional serial interface board could be used however.
* 8087 support - The earliest board would not support it.
* Concurrent operation of 8087 with optional dynamic RAM
boards - The earlier MCY boards did not support concurrent
operation of 8087 and memory expansion boards or EGA boards
with dynamic RAM.
in the latest revision board which allowed both to operate
together.
* Topview Board - Earlier MCY boards did not support IBM's
Topview so a special MCY-TV board was developed to take the
place of the MCY-MT board which allowed Topview to function.
The latest MCY board operates properly with Topview.
EPSON AMERICA
P S
RODUCT
DATE: 7/29/88
MCY BOARD
II
Equity MCY
the earliest
revision Y147206000
An improvement was made to the design
SERVICE, 23610
B
UPPORT ULLETIN
LEVELS
REVISION
boards since
revision Y147201000
(01).
early revision boards only
TEL0 AVENUE,
PAGE: 1 of 2
II
MCY board.
its introduction,
(00) to
TORRANCE, CALIF.
(01)
90505