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From: picano@en.ecn.purdue.edu (Silvio Picano)
Newsgroups: comp.sys.att
Subject: Logic Analyzer Interface to a 3b1 (Please Help)
Message-ID: <1991Feb27.193918.8982@en.ecn.purdue.edu>
Date: 27 Feb 91 19:39:18 GMT
Sender: picano@en.ecn.purdue.edu (Silvio Picano)
Distribution: usa
Organization: Purdue University Engineering Computer Network
Lines: 42


Hi, I am hoping someone may have done the following or 
could point me in the right direction.

I am trying to connect an HP logic analyzer to my AT&T PC
to get analyzer screen printouts.  Now the analyzer 
has an RS232C port and can be configured to use several 
handshaking protocols (e.g., Xon/Xoff).  My major concern
is the difficultly(ies) in accessing the AT&T serial port 
(combo expansion board) and writing the 'data-collecting 
driver routine'.

The ideal operation(?) is,
	1. HP analyzer sends data (already suited for Epson prints)
	2. the AT&T collects ALL the data (in the background, 
		interrupt driven)
	3. then, the AT&T sends the (raw, already formatted) data 
		to the printer

                      ------------
					 |  AT&T 7300 |
					 |  (3b1)  PC |
                      ------------
					  /          \
					 /            \
				  RS232C        Parallel Port
                   /                \
                  /                  \
         ----------                  -------
		| HP Logic |                | Epson |
		| Analyzer |                | fx286 |
         ----------                  -------

My documentation is scarse and not at a 'low enough' level
to accomplish this 'data-collection driver'.  I am hoping
someone may have done something similar (maybe some code??)
and can provide useful hints on doing the above.

I will summarize if I get replies.

Thanks In Advance
Silvio 						picano@ecn.purdue.edu