The KDJ11-E introduced a RTC. The RTC chip used was a DS1215 form Dallas. My MFV board for the PDP-11/Hack as well implements a TOY using the same chip and the same address and interface as on the KDJ11-E

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During the development of the RLV12 Emulators I often thought that it would be nice to have a multi-tasking system running the emulator to replace the very crude scheduler for the various tasks. And very often you would also like to have a sleep() or delay() function that pauses an action for a certain amount of time and automatically make the CPU available for other tasks. So I wrote a minimalistc Real-Time OS for the AVR processor.

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