Replaced in 94? by the 8 speed version. But it will work perfectly with an 8 speed set up - I've got 2 bikes set up as 8 speed with either that mech or the DX version and thumbshifters, both work perfectly.
If it's six speed you'll prob need to change the jockey wheels.
Technically, six speed indrexed Deore XT is the second incarnation, but not Deore XT II, that was the seven speed one. The first pre-indexing Deore XT had the Deer's head on the mechanisms. Pay attention, there'll be a test later!