To check which eprom is fitted, lift the seat to reveal the ECU - large silver box about 6" by 4"
There would originally have been an anti tamper sticker covering a large rubber bung in the top - this will probably have gone.
Remove the bung & have a look inside.
If you have no experience with electronics, keep your fingers out of the way - you could unwittingly cause damage in there if you prod around.
Directly below the hole, you will see the eprom which should have a sticker on it telling you exactly which version it has fitted.
[Edited on 2-5-2005 by Rushjob]