Epson Equity II Product Support Bulletin(s) - Page 29

Product Support Bulletin

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PRODUCT SUPPORT BULLETIN PSB NO.: S-0057 DATE: 7/29/88 PAGE: 1 of 2 SUBJECT: EQUITY II MCY BOARD REVISION LEVELS The purpose of this bulletin is to provide information on the various revision levels of the Equity II MCY board. The attached table describes the differences found in the revisions of Equity II MCY boards since its introduction, beginning with the earliest revision Y147201000 (00) to the latest revision Y147206000 (01). Note: The Y147201000 (02) MCY board is an update of the (01) 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 early revision boards only 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. An improvement was made to the design 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 SERVICE, 23610 TEL0 AVENUE, TORRANCE, CALIF. 90505

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P
RODUCT
S
UPPORT
B
ULLETIN
PSB NO.: S-0057
DATE: 7/29/88
PAGE: 1 of 2
SUBJECT:
EQUITY II
MCY BOARD
REVISION
LEVELS
The purpose of this bulletin is to provide information on
the various revision levels of the Equity
II
MCY board.
The attached table describes the differences found in the
revisions of Equity
II
MCY boards since its introduction,
beginning with the earliest revision Y147201000 (00) to
the latest revision Y147206000 (01).
Note: The Y147201000 (02) MCY board is an update of the
(01)
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 early revision boards only
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.
An improvement was made to the design
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 SERVICE, 23610 TEL0 AVENUE, TORRANCE, CALIF. 90505