Q24. Can anyone out there tell me the pinout for the monitor/keyboard
connector on a DecPro 350?

From "The Professional 300 Series Technical Manual", I have
(p. 8-5):
J1 Pin-outs for the monochrome monitor:

1-3 not used
4 Ground ( video signal ground potential )
5,6 Ground ( operational voltage ground potential )
7,8 +12 Vdc ( operational voltage input )
9-11 not used
12 M Video ( composite video )
13 Ground ( tied to 5 and 6 )
14 Data Receive ( serial data line from the keyborad output to the
system box, via J3 )
15 Data Send ( serial data line from the system box output to the
keyboard, via J3 )

ftp://ftp.update.uu.se/pub/professional/FAQ/profaq

---------- Post added at 02:48 ---------- Previous post was at 01:30 ----------

Нумерация выводов у DB15 и советского разъема разная, насколько я помню, зеркальная. Распиновка разъема еще должна быть на схеме монитора "Электроника МС 6105.02"