The RTC chip is a HD146818 (which is also used in IBM PCs).
== Info Fragment I/O Ports ==
Contains HD146818P (RTC) and TMP[[Z84C20P|Z80 PIO]] ([[Z80 PIO]] chips. * 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 ==
Contains HD146818P (RTC) and TMPZ84C20P chips.
FBE0h Dk'tronics Real Time Clock - probably [[Z80 PIO]] Port A Data (RTC Data bus)