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P2 Silicon Doc - now without the headache! — Parallax Forums

P2 Silicon Doc - now without the headache!

Wuerfel_21Wuerfel_21 Posts: 5,556
edited 2025-09-15 20:43 in Propeller 2

I ported Chip's P2 Silicon google doc (you know the one) to my Markdown-based website format.

Check it out: https://p2docs.github.io/mirror/p2silicon.html

There may still be some errors, please point them out if you see them.

This has many potential advantages over the original google docs version:

  • Loads quickly and doesn't cause your fans to rev up
  • No risk of accidentally editing it
  • No 3rd party vandalism inserted from aforementioned accidents and assorted stupidity
  • Resistant to any theoretical attempts at 1st party vandalism (the Reimu plush will keep it safe and sound, she is a good steward)
  • Resistant to Google-related enshittification (but still hosted on GitHub, so exposed to Microsoft)

Potential downsides:

  • TOC doesn't go into the sidebar (because p2docs' layout wasn't designed for huge monolith pages)
  • Process for updating it is a bit more difficult (but AFAIK this particular doc has been stale for a while)

Also note that while this page has the HyperJump script on it, it will only lead you to the regular unoffical p2docs pages, whose coverage differs from the official docs.

Comments

  • RaymanRayman Posts: 15,618
    edited 2025-09-15 21:35

    Nice. Think you added this part, right? The "usually"?
    It is usually not possible to execute code from hub addresses $00000 through $003FF, as the cog will instead read instructions from the cog register or lookup RAM as indicated above.

    Kind of like the idea of having secret code that takes a trick to execute...
    Guess this can't work in Spin2 mode right? Has to be pure assembly program?

  • Wuerfel_21Wuerfel_21 Posts: 5,556

    @Rayman said:
    Nice. Think you added this part, right? The "usually"?
    It is usually not possible to execute code from hub addresses $00000 through $003FF, as the cog will instead read instructions from the cog register or lookup RAM as indicated above.

    Yes, that's an edit I suggested, so I kept it.

    Kind of like the idea of having secret code that takes a trick to execute...
    Guess this can't work in Spin2 mode right? Has to be pure assembly program?

    That space is just taken up by the Spin2 interpreter when it's in use, so it's not that useful. It's a nice secret feature though.

  • RaymanRayman Posts: 15,618

    Hmm... Maybe a way to restart the Spin2 interpreter then?

  • Wuerfel_21Wuerfel_21 Posts: 5,556
    edited 2025-09-15 22:14

    You can do that already.
    You can't run any normal code in low memory hubexec because branches don't work.

  • RaymanRayman Posts: 15,618

    Hmm… Maybe a way to start alternative interpreter then?

  • Wuerfel_21Wuerfel_21 Posts: 5,556

    That doesn't wouldn't require the wraparound glitch to begin with.
    This is not the place to discuss this, either.

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