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Namely the box.
I believe its the second model of the ifu-30. I believe its exactly the same as the older one that has (IFU-30) printed on the briefcase cover, but this package included the the interface unit and cdrom in one package (The previous model you could buy the cdrom separate I believe). I think this one also comes with the updated system card 2.0 as opposed to the 1.0 of the earlier model.
This is not a revision, this is the pack including both the IFU and the CD-Rom drive.
Fox, do you have a pic of the front cover of the manual? there are two-three revisions of the IFU-CD combo set.
1:white pce on manual cover, packed with system 2.0
2:coregrafx 1 on manual cover, packed with system 2.0
3:coregrafx 1 on manual cover, packed with system 2.1 (unconfirmed?)
I own this set. I'll check my manual