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Davie's program has been [forked several times](https://github.com/timdawg/Deeper-Tought-2/network), but this mode of operation remains in all of the versions I've tried.
When Ian Schofield created the [incandescent lamp simulator](/wiki?name=Incandescent+Lamp+Simulator) (ILS) for the PiDP-8/I, he changed the external interface in a couple of ways which prevented it from being used with any of these versions of Deeper Thought.
When I rewrote the ILS, one of the things I did was add a compatibility interface for programs like Deeper Thought which remain dependent on the old `gpio.c` module interface. This article describes the steps you must take to build a version of Deeper Thought against our new ILS.
If you are running a single-core Pi (e.g. Zero, original A+, original B+...) there is little point to doing this. Just stop the PiDP-8/I simulator and run your chosen version of Deeper Thought directly, as its GPIO method will work the same as our NLS method.
If you are running a single-core Pi (e.g. Zero, original A+, original B+...) there is little point to following this guide. Just stop the PiDP-8/I simulator and run your chosen version of Deeper Thought directly, as its GPIO method will work the same as our single-core GPIO method, which we call NLS to distinguish it from ILS mode.
# Modifying `deeper.c`
The first thing you have to do to build any version of Deeper Thought against the current version of the PiDP-8/I software is copy its `deeper.c` file into the PiDP-8/I software's `src/misc` subdirectory:
$ cd ~/pidp8i ⇠ or wherever the PiDP-8/I source code is
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# 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.
## License
Copyright © 2017-2018 by Warren Young. This document is licensed under the terms of [the SIMH license][sl].
Copyright © 2017-2019 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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