Here's my best guess at what all this stuff is. TMM

Model 3 (asyn, C++) driver base classes
--------------------------------
asynMotorAxis.cpp
asynMotorAxis.h
asynMotorController.cpp
asynMotorController.h

Model 2 and Model 3 device support
--------------------------------
devMotorAsyn.c

Model 2 (asyn, C)
--------------
drvMotorAsyn.c
motor_interface.h
paramLib.c
paramLib.h

motor record
------------
motor.h
motorRecord.cc
motorRecord.dbd

Model 1 (non-asyn) device/driver support
------------------------------
motordevCom.cc
motordevCom.h
motordrvCom.cc
motordrvCom.h
motordrvComCode.h

allstop, alldone
----------------
motorUtil.cc
motorUtilAux.cc
