I need a truley interactive chat script for PPP

[MallarJ2@aol.com]

I need to connect to the mainframe from the office, and have a need for a 
complex chat script.  Can someone help me out?

Under Win95, I have my dialout connection set to bring up a terminal window 
after connecting, so I can do the following:

Login:  <my user name>
Password: <my password>
Challenge: abc93029
Response: 

[Here I take the challenge number above and key it into a card-like device.  
It then gives me another number I need to key in as the "response".  Then I 
press F7 (Continue) to start the PPP session.

How do I mimic this functionality in Linux?  

chat doesn't seem to be powerful enough.  I can use SAY or REPORT to see the 
challenge, but chat doesn't seem to provide a way to key in a number 
interactively.  wvdial doesn't seem to be capable of this either.

Any thoughts?

Thanks,
Jay