Not sure if this helps. From Stern website current IM game code read me:
V 01.83 - 19-August-2014
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System Changes:
- Games built with CPU Part #520-5352-00 need to use V1.83_VE code.
- Games built with CPU Part #520-5246-00 need to use V1.83 code.
- CPU Part #520-5352-00 is built with an FTDI USB chip
- CPU Part #520-5246-00 is built with an Atmel USB chip
- There are no game rule changes between V1.83 & V1.83_VE
- Ticket redemption has been added to Ironman game