PACKET PORT PROBLEM

[brian lagden]

Having just installed TR successfully I decided to try the packet interface:
-no dice!    The TNC does not seem to talk with TR.  The only indication of
"life" I get is if I switch the TNC off and on again while the Packet screen
is up; I then see the following [:x]  - brackets not included.   The :x is
all that ever appears in the Packet window, the keyboard being apparently dead.

I have made sure that I am using the correct baud, parity etc.  The same
port works perfectly using other Packet terminal programmes such as TPK.

The following is the gear involved:

H.F. Radio:        Omni VI
Computer:          486 DX/33 with recently added I/O card to provide an
extra                      serial port and parallel port (for the keying line)
TNC:               MFJ 1270 (modified to 1278)
VHF Radio:         Not connected at present, but presumably this should not
interfere with communication bertween computer and TNC.

All suggestions gratefully received!   ..73 .. Brian .. VE7QH ..