Epson Equity II Product Support Bulletin(s) - Page 43

Leap Year / Ms-dos 3.1 Date Change

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EPSON EPSON AMERICA INC. SERVICE DEPARTMENT PRODUCT SUPPORT BULLETIN DATE: 3/2/88 SUBJECT: LEAP YEAR / MS-DOS 3.1 DATE CHANGE NUMBER: S-0037 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. Page 1 of 1

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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.
Page 1 of 1