It might be better to consider buying a ready-made one at
just $199 instead, e.g. from:

  ProBoard Circuits
  100 Market Street, unit 16
  Galveston, TX 77550
  Ph:  (409) 762-5436
  Fax: (409) 762-4167
  Contact: Mani Omid

It features 24 channels, 50 MHz sampling speed, a PC based
user interface (VGA), an RS232 link to host (w/ documented
command set), programmable trigger, and, one year warranty.
So, why settle for less? By the way, they recently have
announced that the new boards even are capable of working
as pattern generators.

  Dieter Klopsch
  dk@zwoka.cam.rhein-ruhr.de

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