DS1307RTC Library, For Accessing Real Time Clock (RTC) Chips
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Dallas DS1287 DS12887 DS12B887 BQ3287 OEC12C887 real time clock chip 386 486 RTC | eBay
Adafruit PCF8523 Real Time Clock Assembled Breakout Board : ID 3295 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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