When I realized that the RTC in the newest PDP‑11 was just a DS1215 from Dallas and it was just a one-bit interface in the Additional Status Register it was obvious that I wanted this feature in my PDP‑11/Hack.

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I’m apparently not the only one that was interested in the RTC of PDP-11. Oleg Saffiulin has published a small program written in MACRO-11 that is able to read the RTC. But how can you set the RTC?

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The RTC clock is directly supported by various operating systems of digital. If the support for the Time Of Year clock is activated depends itself on the correct module ID. Here is how this works.

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