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How Does ClockCard Work?
ISA Version PCI Version
When the ClockCard is first installed in the PC, it will automatically assume the date and time of the PC. Whenever the PC's BIOS (Basic Input-Output System) is asked for a date or time, this date and time will come from the ClockCard RTC and not from the System RTC.

ClockCard works by resetting the motherboard RTC chip with the correct time and date each time the PC is booted. This process occurs automatically before Windows has been loaded and cannot be disabled or bypassed by the user. No software needs to be loaded or installed for this process to happen. 

Whenever the BIOS is instructed to change the date and time, this changes the ClockCard RTC as well as the System RTC. Whenever the BIOS is asked for a date or time, the ClockCard date and time is copied to the System RTC so that both clocks are kept in sync with one another as much as possible. Each time the PC is powered up (turned on) or reset, ClockCard will change the System's RTC to match its own RTC.

ClockCard occupies a single 4 Kb upper memory area (between C800h and DC00h). To ensure proper operation, no other add-on cards must be installed on the same memory area. Also, make sure that the BIOS shadow memory is turned off on this area and that memory managers like EMM386 do not re-map this area with RAM.

The time and date on the ClockCard will be synchronized with your motherboard time and date after installation. If your system time and date is corrupt, either before 1998 or after 2010, then the current time and date on the ClockCard will be used as your new system time/date. If your system’s time and date is correct at the time of installation, then no further adjustment of the system time and date is needed. To change the time and/or date after installation, use the standard procedure for doing this on your operating system.

 

Because of it's own Real Time Clock (RTC) the ClockCard PCI maintains an accurate date and time.

The ClockCard PCI includes a temperature compensated 32KHz oscillator. The DS32KHz is a highly  accurate replacement for standard 32.768-kHz crystals commonly used in real time clocks (RTC).  

Inside the ClockCard PCI oscillator package are a quartz crystal and a temperature-compensation IC. The compensation IC employs low current oscillator technology and  thermal-sensing technology. It is this temperature compensation that gives the overall precision of the PCI ClockCard in the 2 PPM range.


A separate ClockCard process keeps the operating system maintained at the ClockCard time, refreshing it every 10 seconds.

 

ClockCard Specifications
ClockCard Main Page
ClockCard Product Index

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Copyright 2007 Beagle Software. All rights reserved
Last reviewed March 19, 2008