This board takes in the 40-pin ribbon coming down from the MVD. Here is the relevant cable in the signals document. It arrives on a 40-pin 0.1"×0.05" connector. The digital I/O signals for the custom ADC readout are split out to a 16-pin 0.1" connector, and the digital signals that do the switching for the spy line readout are split out to a 14-pin 0.1" connector.
The fast analog spy line signals are sent through a 17-MHz optically isolated optocoupler chip and then a clc426 driver drives the BNC coax to the control room. The CR side of the circuit gets power and ground from the CR.
spy line driver chip,

ps version	ps

The circuits were tested by using a 1.3V square pulse as input. Values in the table are in volts.

Test results: board circuit output noise 1 A 8.5 2.8 B 5.2 2.0 2 A 5.8 4.0 B 8.5 4.0 3 A 0.75 0.7 B 7.8 2.2 4 A 8.0 2.8 B 7.9 2.0 5 A 7.0 6.0 B 6.0 8.0

parts list (for 4 boards +1 spare ):
		per circuit	+per board	total	have
optocoupler chip	Agilent HCPL-4562	1		10
op amp	Nat.Semi. CLC426	1		10
transistor Q1-4:	2N3904	4		40
diode D1	1N4150	1	4	30
cap C1,2,3	electrolyte 47 uF	3	1	35
R1	6.8 K	1		10
R2,12	1.0 K	2		10
R3,10,13	100	3		30
R4	51	1		10
R6	9.1 K	1		10
R7	15.0 K	1		10
R8	1.0 K	1		10
R9	750	1		10
R11	470	1		10
R14	33	1		10
potentiometer	500	1		10
connector	0.1" 14-pin right angle		2	10	10
connector	0.1x0.05 40-pin r.a. 3M 81040-5502-3		1	5
connector	VME backplane		2	10	10
connector	BNC feedthrough		2	10	10
lv connector	(burndy)		1	5	5
sockets	for 8-pin chips	2		10	make
front panel			1	5

	ps version
	ps version
	ps version