The port observed that the justification for 60 has changed three times
while the number never moved, and that three routes sharing an upstream
assumption are weaker than they look. Checked. They do share one.
Route B needs "the guest presents 60x/s", which comes from the vblank
histogram UNDER XENIA'S 60 HZ LIMITER. Route C needs "the vblank is 60 Hz",
which is that limiter's cvar directly. Route D is a wall-clock duration
that lands on 60 only because the vblank is 60 Hz and Canary roughly keeps
up. All three reduce to one fact: the display refreshes 60 times per second
on this emulator. I presented them as corroboration and that was wrong.
What is actually established, by manipulation rather than agreement:
units/second EQUALS the display refresh rate. Forcing 30 Hz gave 30.2
units/s; at 60 Hz it is 59.8/61.3. One factor changed, the output tracked
it.
It becomes "60 units/s" only via an external fact this corpus has not
measured -- that an Xbox 360 outputs 60 Hz. That is a hardware
specification and it is solid, but it belongs outside the measurement
rather than laundered into a third agreeing route.
The conditional form is more useful anyway: it says what to do on hardware
that is not 60 Hz, which is exactly why the port's time-based clock at a
fixed 60 units/s is the right construction rather than a coincidence. And
it keeps the port's `authored` classification correct -- nothing here
promotes it.
Also sizes the clock-origin capture properly. FRAMES=9000 ran to completion
still in the movie at 8999, so the cap really fired this time. Content
hashes show 3967 distinct decoded frames against ADV.wmv's declared 4131 --
96% complete -- at 1.79 presents per decoded frame, not the 2.00 I assumed,
which is why the estimate was short. Needs ~294 more presents to clear the
movie plus >=236 for the plate, so FRAMES=11000.
Free on the way past: 3967 decoded frames over 7091 presents at ~52
presents/host-s is 29.1 movie frames/s against the disc's declared 30.000,
a 3% match that ties the present rate to a disc fact rather than a clock.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jc4pciRArGHfxGGhEbwp5t
cb3446d4f6