B&B Electronics PCRTC manual General Information, Introduction, Packing List, Specifications

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Chapter 1. General Information

Introduction

The PCRTC is real time clock for PCs based on a highly stable oscillator circuit. Using the software driver provided, the PCRTC will update the DOS clock every minute, ensuring that all applications have access to accurate time information.

With a simple function call, the PCRTC also reports battery status and the time of the last power loss or computer reset.

Packing List

Examine the shipping carton and contents for physical damage. The following items should be in the shipping carton:

1.PCRTC unit

2.One PCRTC 3.5” disk

3.This instruction manual

If any of these items are damaged or missing contact B&B Electronics immediately.

Specifications

Setup

Address: Programmable with four position DIP switch

Interrupt: None required

Oscillator

Temperature Stability: < 5 ppm 0 - 50 ° C

Calibration: < 1 ppm @ 23 ° C (room temperature)

Aging: < 1 ppm

Power Requirements 35 mA @ 5VDC

Battery

Requires lithium AA battery 3-4V

Battery Life: approximately 10K hr. without host computer powered.

Replacement batteries are available from B&B Electronics, order as part number 3345.

Dimensions: 4.8” l x 3.0” h

Documentation Number PCRTC2095 Manual

1

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 433-5105

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Contents Electronics Mfg. Co. Inc Designed and Manufactured Ottawa, IllinoisInternet Table of Contents Packing List SpecificationsGeneral Information IntroductionHardware Setup SetupSoftware Setup Hardware InstallationUsing the Device Driver OperationOverview Setting the Pcrtc Time and Date Command Line OptionsProgramming with the Pcrtc Replacing the batteryStartRTCAPI BatteryRTCWord GetRTCTimeLastPowerDownRTC Pascal Programming Example QuickBASIC ExampleProgramming Example Calculating Error Oscillator ErrorPPM Terminology Aging Map of XT Class Machines Appendix A. Hardware I/O MapHardware I/O Map of AT Class Machines