On my last "shopping" trip, I picked up the following qbus cards:

M7577
M7576
M7507
M7507    (yes, there are two of these!)
M3107     (labelled DHQ11 8 line async)
M7578    (seems to an interface to the other cards. The db-37 connector
has a ribbon cable going to the DHQ11,
                and the other, a db-25 goes to the M7576)
These are listed in order going from the cpu end of an S-box Qbus
chassis, and the M7576 and the 2 M7507 cards are connected by a "bridge
card" labelled CVAX 3-pack. The M7577 and M7576 are also tied together
by a (~20 pin) ribbon cable.
They were the last cards left in the box......

Any ideas as to what they are??

Thanks.....

Stan