... of introduction they were some of the smaller connectors used on computer systems.Hard disk,Network ... the whole cable and connector system.D-subminiature connectors were invented by ITT Cannon, part of ITT ... the shell size (A=15 pin, B=25 pin, C=37 pin, D=50 pin, E=9 pin), followed by the ... 25 position contact configuration. The contacts in these connectors are spaced approximately 0.109 inches (2.77 ...