The Dobbertin Smart Watch was produced by Dobbertin Industrie Elektronik, a German company. This real time clock was relative wide spread in the 80ies and 90ies.
Technicals
The Smart Watch consists out of the RTC itself and an EPROM expansion with a lot of RSX commends. The RTC itself was inserted like an EPROM in any kind of ROM or EPROM card. Further it contains a little battery. At least one clock is still running in 2010!
Software
- The TimeROM+ Software provides RSX commands to use the RTC under BASIC.
- Support for CP/M Plus was provided. The TIMEROM+.COM program sets the software clock according to the RTC.
- The Smart Watch is also supported by FutureOS.
Source Code
(Have to find out how to implement it here... please be patient)