* 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)
* [[SYMBiFACE_II:Realtime_clock|Realtime Clock]] of [[SYMBiFACE_II]] (modern RTC with bugged century counter)