[ntp:questions] Kernel PPS programs.

Uwe Klein uwe at klein-habertwedt.de
Wed Feb 8 17:45:51 UTC 2012

David Woolley wrote:
> unruh wrote:
>> I suppose I could turn of the interrupts on the card for 500ms then turn
>> them on again to catch the next PPS, but that is a real kludge.
> In the 1970s, level triggering was the norm.
> The response to ACK is supposed to be to load another outgoing byte or 
> to turn off interrupts on the card.  Using it for an open loop PPS 
> signal is abusing it in a way that only works with edge triggered 
> interrupts.

It is not really a 70ties feature but the result of
a braindead and cheap design.

Zilog and Motorola had well thought out extendable "architecured" designs
while Intel produced "bottom scrapings".
Interesting that just like Microsoft they essentially won out
with below par products.


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