> 1) Which cpus were "mayfair" ones?, apart from the ka640 that is.

According to the list of cpu-data which is (was?) regularly posted
to comp.os.vms the Mayfair cpus are:

---------+---+-----+------+------+-------------------------------+------------
   SID   | X | Id  | VUPS |  Bus | Model Name                    | Nickname
---------+---+-----+------+------+-------------------------------+------------
...
-- CVAX chip series (1987) - Decimal SID = 167772160 ------------+------------
0A00000x | 1 | 650 | 2.8  | Q    | MicroVAX 3500, 3600           | Mayfair
0A00000x | 1 | 65D | 2.8  | Q    | VAXstation 3200, 3500         | Mayfair/GPX
0A00000x | 1 | 640 | 2.4  | Q,D  | MicroVAX 3300, 3400           | Mayfair II
0A00000x | 1 | 655 | 3.8  | Q    | MicroVAX 3800, 3900           | Mayfair III
...

> 2) The ka640 has lance and dssi on board, does the ka650 and 655 have
> the same?.

According to the above list, the others are pure Q-bus machines.

Ciao,
	bertram