EmulatorII-list

Hello Group

 My question is I have an E-II and the E-II+. they both have
Rev 1 Boards both manufactured in 1984,is there any major
difference between the two????sample time is still 17.6 
running O.S 3.1 .I did notice what looks like xtra eproms
on the plus model but how and what would that be for???
 Lastly when I try to access bank 2 on the plus model the 
enter and disk light stay lit with a message display of
 Di">>K [1 or 2!N   []
what does that mean???
please help i want to get both these icons back up PAR.

Thanx

P.S.
is one model better than the other or better suited for 
certain task and MODs