This connector is present on the Macintosh LC, LC II/Performa 400, IIci, IIsi, Quadra 700, Quadra 900/950, Macintosh Duo Dock, and Duo MiniDock.
Pin Name Description
1RED.GNDRed ground
2RED.VIDRed video signal
3/CSYNCComposite synchronization signal
4SENSE0Monitor sense signal 0
5GRN.VIDGreen video signal
6GRN.GNDGreen ground
7SENSE1Monitor sense signal 1 (grounded internally)
8n/cNot connected
9BLU.VIDBlue video signal
10SENSE2Monitor sense signal 2
11C&VSYNC.GNDGround for CSYNC & VSYNC
12/VSYNCVertical synchronization signal
13BLU.GNDBlue ground
14HSYNC.GNDHSYNC ground
15/HSYNCHorizontal synchronization signal
ShellCHASSIS.GNDChassis ground
15 pin D-SUB female connector layout
15 pin D-SUB female connector
at the computer
15 pin D-SUB male connector layout
15 pin D-SUB male connector
at the video cable
According to 2 reports in our database (2 positive and 0 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: Technote HW08: Color monitor Connections at Apple Technical Notes, from Hardware Book
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