V1.0
----
Original NT sources

V1.1
----
NT-specific functions used in Tcomm moved into a single file.

V1.2
----
Tcomm, a low level unit test progam works under Linux!

V1.3
----
Tctapi project (make file in pc/linux) compiles under Linux but core 
dumps when run.  Tctapi is a test program that includes all of the 
vpbapi driver files.

V1.4
-----
Tctapi project running (at least first test_play_file_sync() test 
function).  Has a simple device driver to support port access.
This program plays the simple wave file alaw.wav, then exits.

Device driver vpb.c is in pc/hip directory.  To compile and install:

cd to pc/hip
gcc vpb.c -c -O
insmod vpb.o		/* on installation major number will be printed */
mknod /dev/vpb0 c major_number 0

To compile and run tctapi:
cd pc/Linux
make
tctapi

V1.5
----

As for 1.5 but:

1) Support for ACS (open source IVR scripting system, see www.voxilla.com)
   added (new event for single DTMF digit).
2) make file in pc/Linux generates a library (libvpb.a) rather than 
   an executable.
3) Firmware (c50/vpbmain/vpbmain.out) must now be placed in etc/vpb


