Contains a HD146818P (RTC), a TMP[[Z80 PIO|Z84C20]]P ([[Z80 PIO]]), three logic chips, and a 3.6V battery.
* Reportedly: DK-Tronics RTC module used the [[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.
FBE0h Dk'tronics Real Time Clock - probably [[Z80 PIO]] Port A Data (RTC Data bus)