modem trouble

[R. Munroe]

I'm having a bit of strange trouble with a Hayes Ultra 9600 Smartmodem
hooked up to a PI 25.  I can dial out O.K.  I also have no trouble
dialing in - the modem connects, I get my login prompt, etc.  The trouble
starts when I issue a command who's output is more than 5 or 6 lines.
For example, if I issue an 'ls' command, the first 4 lines of my 
directory listing print out fine.  The next line is completely garbled
and the following lines don't print.  If I enter a carriage return, my 
prompt appears as normal, and I can continue along happily - until
I issue another command that prints more than four (or so) lines
to my screen (the problem may actually start after a certain number
of characters have been printed - it just seems four lines of output
is the average).

I've tried the modem on /dev/ttym2 and /dev/ttyf2 with the proper cables.
I've reset the modem to factory defaults and run 'fix-hayes' on it.
Every time the same problem.  Any ideas would be greatly appreciated. Thanks

Bob Munroe
TOPIX Computer Graphics + Animation, Inc.
topix at utcs.utoronto.ca

416.971.7711