[W]e're trying to limit our search to things we
could get, rather
than make,
Ah! Okay.
Construction is likely to be bit serial, and the
target is 500k -
1000k bits per second through the loop, maybe an instruction rate of
10% of that.
That's higher than I'd expected, especially in view of your "20kHz is
about the max available frequency" note.
I will say some of the replies on this group are
realistic -- when I
mentioned this at work one colleague (Windows Programmer) asked if it
would run a web server. Sigh.
Heehee! Sure it will - just verrrrrrrry slowly. :) (Hey, someone has
a webserver on a C=64, I think, and that one actually borders on
usable.)
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