* CPCI [[Real Time Clock]] (DIY)
* [[Dk'tronics Real Time Clock]] ([[Dk'tronics]])
* Dobbertin Real Time Clock -- aka Dobbertin Smart Watch (the RTC itself is inserted like a ROM select 15)
* [[SYMBiFACE_II:Realtime_clock|Realtime Clock]] of [[SYMBiFACE_II]] (modern RTC with bugged century counter)