The KDJ11-E was the CPU card introduced with the PDP‑11/93 and PDP‑11/94. This CPU card was based on the DCJ11 CPU designed by digital and produced by Harris. It also, for the first time, introduced a Real-Time Clock (RTC) to the PDP‑11 computer family. The chip used was the phantom clock chip DS1215 from Dallas. The following article shows how I implemented the phantom clock in my PDP‑11/Hack which is recognized by the operation system of digital

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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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