The 861v6 is defined by the following core cards as standard:
CO00: Control computer card. Complete with Flash memory, RS232 port for control and status, 3x configurable trigger outputs and 2x Meridian Comms.
CD20 & EF20: Internal (no rear panel) 48-bit DSP cards each containing two Motorola 56367 chips running in dual precision mode, each card offering 300 MIPS (million instructions per second) capability.
These 3 cards and the Z8 backplane are carried forwards from the 861v4.
The hardware is the same, v6 and the v4?