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Almost nothing known about this.

== 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

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