User`s guide

EPSON
EPSON AMERICA INC.
SERVICE DEPARTMENT
PRODUCT SUPPORT BULLETIN
DATE: 3/2/88 NUMBER: S-0037
SUBJECT: LEAP YEAR / MS-DOS 3.1 DATE CHANGE
This bulletin describes a problem identified in Epson's MS-DOS
version 3.1 which was supplied with the Equity II and Equity
III personal computers.
On March 1, 1988 we discovered that the system date did not
change correctly to 3-1-1988, but indicated
2-29-1988. As you
may have guessed, MS-DOS 3.1 did not handle the February 29th
"leap day"
change correctly.
Both the Equity II and Equity
III use a Real
Time
Clock/Calendar with CMOS RAM to retain the date and time after
it is set with the SETUP utility program. Even though
the RTC
has the correct date
(03-Ol-1988), DOS interprets it as 02-29-1988.
The easiest
method of correcting this
anomaly is to set the
date in the RTC's CMOS RAM one day ahead as follows:
1. Run the
"SETUP" utility program.
2. Select REAL-TIME CLOCK.
3. Set the DATE to the current date + one.
4. EXIT to save the new date.
5. Re-boot the system!
When MS-DOS 3.1 retrieves the date
from the RTC it subtracts
the extra day and will display
the correct
date for system
operation.
This problem does not exist with MS-DOS version 3.2 should the
customer decide to upgrade.
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