295 bytes added, 
17:47, 3 January 2010 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