Have you guys looked at Bitscope. Its a 25MHz mixed signal capture engine
and uses a PIC16F84 to communicate to the host at 56K. It uses a really neat
instruction set to control it.

It has 2 analogue channels and 8 digital channels , and 2 x 32 Kb buffers
(it uses 2 of the static RAM chips off 484 mother boards), with lots of
control over how data is captured.

Best of all it's an open design. The schematics are available on line. It's
at http://bitscope.com

The PCD, programmed Pic and PLD cost $70.00

BTW I don't have any connection to the company, except that I've built on up
and am very happy with it.

Peter.
---
Peter Homann    Email:  peterh@adacel.com.au
Adacel Technologies Ltd _/_/_/ _/_/_/ _/ Phone:   +61 3 9596 2991
250 Bay St, Brighton   _/  _/   _/   _/  Fax:     +61 3 9596 2960
Victoria  3186        _/_/_/   _/   _/   Home:    +61 3 9555 5603
AUSTRALIA            _/  _/   _/   _/_/_/Mobile:      0414-494578
------------------------------------------------------------------------


|  -----Original Message-----
|  From: pic microcontroller discussion list
|  [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tom Handley
|  Sent: Tuesday, 11 August 1998 21:39
|  To: PICLIST@MITVMA.MIT.EDU
|  Subject: Re: PIC-based Logic Analyzer GUI source code available.
|
|
|  at 10:37 AM 8/6/98 -0500, Monny Omeed wrote:
|  >I have been following the discussion on this PIC based
|  logic analyzer
|  >with great interest for some time.  I was the designer of a
|  24 channel,
|  >50MHz. logic analyzer that was distributed by Proboard
|  circuits several
|  >years ago.  This product was useful for many customers, but as a
|  >designer, I was always trying to eliminate its
|  deficiencies, and improve
|  >its performance.  We had plans to increase its triggering capability
|  >using a Lattice PLD, and to add a Digital Storage Scope front end to
|  >provide mixed mode analysis.
|  >
|  >The work we did on this product was mostly for the pleasure
|  of creating
|  >such a product, and making it available for other fellow
|  engineers to
|  >use.  After several years, our available spare time ran
|  short, and we
|  >were forced to stop on this development.
|  >
|  >I was delighted when I find out Tom had taken the
|  initiative to create
|  >what I had planned as the next generation of our product.
|  This way, we
|  >can vicariously appreciate this accomplishment.
|  >
|
|     Monny, great! I'm doing this in my spare time but I'm
|  determined to
|  see it through. My primary goal is to provide the core logic
|  and hardware
|  schematics. Then I'll toss it out to this group for the
|  software work.
|
|  >So far, I have seen many updates on the hardware for this
|  product, but I
|  >am not sure if a suitable front-end software is available
|  yet.  For this
|  >reason, I wanted to offer the source code to the graphical user
|  >interface we had for our last released product.  This was
|  written using
|  >Microsoft C, and it provides a full color display panel.
|  It uses either
|  >a mouse, or function keys.  It runs on plain DOS.    We
|  also began the
|  >development of a Windows version of the interface using
|  Visual Basic.
|  >Most of that development is finished as well.   If anyone
|  is interested
|  >in retrofitting this software to use with Tom's hardware,
|  please let me
|  >know, and I will try to make it availabe.
|
|     Thanks for the offer! I have not worked on the GUI yet. I
|  was going to
|  use C/C++ and a Windows 95 GUI but I'm leaning towards
|  VBASIC right now.
|  Due to the generic nature of this, there is room for a
|  variety of GUI's
|  and OS environments.
|
|     - Tom
|
|  >
|  >Best regards,
|  >Monny
|
|
|  Tom Handley
|  New Age Communications
|  Since '75 before "New Age" and no one around here is waiting
|  for UFOs...
|
|