 The 9LV Mk2.5 introduced a new high level language (RTL/2) and also upgrades to the hardware architecture with new processors and busses.The Swedish Navy Arte726E is an example of 9LV Mk2.5.Based on the experiences from 9LV MK2.5, a major redesign of 9LV was performed for 9LV Mk3, starting around 1985.