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The Deeper Thought installer script will mark its service to start by default. If you don't give those two commands, Deeper Thought will crash on boot because it can't grab control over the GPIO lines going to the PiDP-8/I front panel while the PiDP-8/I simulator is running.
# Why Not Make This Easy?
You might be wondering why I describe how to modify `deeper.c` to build against the PiDP-8/I software instead of just integrating it and shipping it along with it. It's because this software is not licensed under any open source license, and attempts to get the authors to so license it have been ignored. Therefore, I cannot re-distribute this software, even though it is freely-available on the Internet.
# Reverting to Boot with the PiDP-8/I Simulator
To revert the changes made in the previous section and mark Deeper Thought to not start on boot, say:
$ sudo systemctl stop deeper
$ sudo systemctl disable deeper
$ sudo systemctl enable pidp8i
$ sudo systemctl start pidp8i
## License
Copyright © 2017 by Warren Young. This document is licensed under the terms of [the SIMH license][sl].
[sl]: https://tangentsoft.com/pidp8i/doc/trunk/SIMH-LICENSE.md
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