I know a lot of folks have been wondering just what was done for the 01C rom. It's not subtle!
Here are the transient ignition retard tables from ZA1JA00C and ZA1JA01C (USDM) factory ROMs as read by Ecuflash and RomRaider betas. This table contains the only difference between the roms (which share a
nearly common definition) according to RR.
Many thanks and mad respect to the RR and Ecuflash crew!! (I am merely a happy end user).
Edit: updated definitions, but still alpha. Thanks Td-d!!