The change was to standardize the addressing of XDF items for use with or without the NVSRAM board. Functionality is the same.
I did sneak in one tidbit. (see item 5)
Revision history and notes:
41026 V4A & B Version: 04-30-2008
1.) Corrected issue with NVSRAM usage where data tables were not located to fit in the available memory space. Checksum would fail and default
“chip” program would restore negating any changes on the fly.
2.) Version 4A created for std use.
3.) Version 4B created for use with NVSRAM module.
(confirm at Location 800A-800D to verify the version)
4.) DXF changed to allow both bins to operate from the same definition file.
File: S_AUJP_V4a.XDF
Late Error 
Change Ext VE table address to "9A0" in XDF file and save.
5.) Added Program ID function.
If ALDL location 16 is changed to read $01BA, the value at L800A will be
displayed in the datastream. Great for switcher guys to see current
program that is being run. Display will be in the NV Ratio item.
Figured nobody uses that anyway. No conversion needed. 0-15 Value
6.) Reworked the V4 Document to show changes.
Major Note:
When converting from the original V4 to this new version, You can use the
“Difference Tool” in TunerPro to copy over your existing values.
DO NOT COPY ANY VALUES FROM ADDRESSES L8998 AND HIGHER.
These items were rearranged and will certainly not be what you want.
Print screen or Export your data to a text file and manually enter your setup numbers.
There is not many and doesn't take long.
This would include:
Wide Band setup options 1 & 2
VE Upper Table Extended to 6400 RPM (Z69)
PE , % Change to AFR Vs. RPM Extended Table (Z69)
Launch Mode Retard Vs Speed (Doesn’t work so don’t bother)
U6 Channel Read (S_V4 A & B ONLY)
TCC Coast Release Disable (S_AUJP V4 A & B ONLY)
John
