************************* MS121 Revision History ***********************************
*
* V4-00         10/8/2012 Initial release, based on MS120 version 3.30.
*
* V4.10         7/11/2012 The instruction "OBCBSetUp" has been re-instated as it is required by a customer.
*
* V4.11         16/1/2013 Instructions FixMem16 and SFixMem16 preserve W. Bug fixed in MODBUS which would
*               cause unpredictable results when more than 7 coils were updated using the Force Multiple Coils
*               (function 15) MODBUS command. The board now reports 64K of memory.  
*               
* V4.12			 10/9/2013 set old crystal pins to outputs
*               fixed a MODBUS inputs Bug
*               fixed Xwire lcd type bug
*               added custom characters to lcd
*
* V4.13			 11/9/2013 fix a bug in LCD custom characters
*               corected mistake with lcd type bug
*
* V4.14         31/1/2014 Added SPxPoll1 8,!CPU command to allow a user program to read back the state of the back light.
*               Command returns a number between 0 - 8 in X in the case of the auto dimming function and either 0 or 8 if
*               the back light is being driven directly from output 20.
*
* V4-15			 25/6/2015 Added more tasks to the SPLat multitrack environment. This version of firmware can now run up to 50 
* 				    tasks (previously 32). Latest Xwire driver and string comms module added.
*