Re: RP2350 and Pico 2 - things missing

On Thu, 15 Aug 2024 17:47:51 +0100, James Harris wrote:

Of course, it could be possible to run into more PIO memory than 32
words as long as the requisite jumps were back to the initial 32-word
space but that would be awkward to use, and limiting.

Or, you could bring back the old PDP-8 trick, of having the jump address
be in the *current page*. That means the upper bits are taken from the
current program counter.

There was actually a separate mode bit that indicated whether the address
was in the current page or page 0. And another bit to indicate whether the
access was indirect (i.e. don’t take the contents of that address, take
the contents of the contents).