Dk'tronics Real Time Clock

Contains a rechargeable battery, five chips, a quartz crystal, and a few odds and ends. The RTC chip is a HD146818 (which is also used in IBM PCs).

Info Fragment

Reportedly: DK-Tronics RTC module used a Z80-PIO chip to address the RTC itself as Port A of the PIO, with a 9-pin user i/o port as Port B.

I/O Ports

 FBE0..FBE3  Dk'tronics Real Time Clock
 FBE8        Dk'tronics Real Time Clock

Review

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