[Bug 227687] PPS echo pulse on ppbus too short
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Date: Sun, 26 Jul 2026 13:02:08 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227687
Poul-Henning Kamp <phk@FreeBSD.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |Overcome By Events
Status|New |Closed
--- Comment #1 from Poul-Henning Kamp <phk@FreeBSD.org> ---
I am reviewing old tickets "on my list", and got to this.
Given the scarcity of actual parallel ports these days, their distance from the
CPU's execution units, and the general state of timekeeping, I'm timing this
bug out.
Note to original submitter:
If the echo pulse did not make it through the EMI filters on the parallel port,
the same filters also delayed your input pulse significantly.
Given the high tempco of the cheap/disposable passive components in such EMI
filters, trying to calibrate the systematic delay out would probably be an
total waste of your time in the first place.
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