Article ID: 78672 - Last Review: May 10, 2003 - Revision: 2.0 Computers That Do Not Maintain Date/Time with MS-DOS 5 or 6This article was previously published under Q78672 SYMPTOMS
When upgrading some MS-DOS versions (primarily original equipment
manufacturer [OEM] versions) to MS-DOS 5.0, 6.0, or 6.2 the time and
date are no longer maintained when the computer is rebooted.
CAUSE
The CMOS (complementary metal oxide semiconductor) chip was introduced
as a standard for storing hardware information (including time and
date) with AT-class machines. When XT machines were introduced, there
was no standard for saving/accessing the date and time information.
Computer manufacturers (OEMs) often added hardware to store and
maintain the date and time settings. To then access this hardware,
those OEMs had to modify MS-DOS. Thus, when the upgrade to MS-DOS 5.0,
6.0, or 6.2 is made, the modifications are overwritten and the time
and date are no longer accessible.
WORKAROUND
Some OEMs have developed device drivers and hardware for their
machines that allow the time and date to function properly, but others
do not support time and date in MS-DOS 5.0, 6.0 and 6.2.
The following is a list of computers that have been found to lose the date and/or time when booting with MS-DOS 5.0, 6.0, and 6.2. The Workaround column lists device drivers/cards that may be used to work around this limitation. Computer, Manufacturer's Phone Workaround -------------------- ---------- 8088 Sperry Model 20 Not supported with MS-DOS 5.0, 6.0, or 6.2 (800) 448-1424 AT&T 6300 ATTCLOCK.SYS (908) 769-6397 AT&T 6300 WGS ATTCLOCK.SYS (908) 769-6397 Canon A200 (8088) Not supported with MS-DOS 5.0, 6.0, or 6.2 (800) 423-2366 Hyundai XT RTCCLK.SYS Model 16T,16E,16X Contact dealer Leading Edge Model D CLKDVR.SYS (900) 370-4800 PC Limited XT SETCLOCK.SYS (512) 338-4400 BBS: (512) 338-8528 Vendex Headstart XT 8 bit clock card (900) 454-5554 Tandy 1400 LT,FD, HD Not supported with MS-DOS 5.0, 6.0, or 6.2 (817) 878-6875 Zenith 183 or 184 laptop Not supported with MS-DOS 5.0, 6.0, or 6.2 (800) 842-9000 The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability. APPLIES TO
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