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15 pin D-SUB female connector layout
15 pin D-SUB female connector
at the terminal
IBM 3178 Control Unit Terminal Keyboard connector

Connector Nr. 5 at the IBM 317x logic unit (introducted 1983) for connection to keyboard.

Pin
Number		 Pin
Name		 Description
1   Frame Ground
2   +5 Vdc
3   ÷ Power On Reset
4   ÷ KBD Data Avail.
5   ÷ Serial Data
6   +12 Vdc
7   Signal Ground
8   Signal Ground
9   ÷ Serial Data Clock
10   ÷ Acknowledge
12   ÷ Command 0
13   ÷ Command 1
14   Signal Ground
15   Frame Ground

Omitted pins are Not Connected.

15 pin D-SUB male connector layout
15 pin D-SUB male connector
at the keyboard
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