hardware advise the second

[Alexander Lichius <Alexander.Lichius@ruhr-uni-bochum.de>]

Hi 

  some days ago i asked for advise on data aquisition hardware on
  comedi mailing list (see below). thank you for the responses so far!
  but now there are some topics i wonder about. as stated i am looking
  for a high performance analog input card. high performance meaning
  about 10 kHz sampling rate per channel. ideally the card is
  supported by comedi to be hardware independent, but that should not
  be the most important creteria.
  what i am wondering about is if i loose samples or get some time
  failures with such high sampling rates. until now we used to have
  SORCUS card and use it under windows/nt. this card has a "sample and
  hold" feature which is just perfect for our requirements. by that
  all data is sampled at the same time and put in a register until the
  next trigger.
  looking through the specs of the supported comedi cards i didn't
  found such a feature. has anybody experience in using cards without
  "sample an hold" with overall sampling rates of about 200 kHz?
  because my goal is to develop a "low cost" data aquisition system
  cards below 1000 $ are much appreciated.

  besides i have some questions regarding RT-Linux in general, because
  i just started playing around with the examples.
  is there any documentation about IRQ programming (e.g. firing an IRQ
  over the parallel port or other means of hardware)? is there any
  documentation about the programming of mainboard real time clock (as
  used in the sound and the V1 parallel port examples, which i ported
  to the V2 API)? where are the used structures documented? i only
  found man-pages for the different functions (like pthread_create,
  etc) but not for the structures in particular.

  thank you in advance!

CU
 Alexander                          mailto:Alexander.Lichius@ruhr-uni-bochum.de