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Sun 13W3-M to HD15-F (VGA) Video Port Adapter
Connect an older Sun computer system with the 13W3 connector to a newer monitor with an HD15 VGA connector using this simple adapter. Alternatively, this adapter, in conjunction with PID 70, can be used to connect a Sun monitor to a Sun system, using a standard HD15 VGA Male to Female extension cable.
The adapter has a male 13W3 plug for connecting to the Sun computer's video output and a female HD15 plug for connecting to the VGA cable from a standard VGA/SVGA monitor. Each end features plastic thumbscrews for securing the adapter to the device.
Note that this adapter is specifically designed for the pinout of the Sun systems and will not work properly with other 13W3 connectors, such as those from older Apple, SGI, or NeXT systems, which used the same connector with a different pinout configuration.
Using the Mini DisplayPort Thunderbolt to VGA Adapter from monoprice , this adapter and a standard Male to Male VGA cable it worked.
I had tried to use the HD15 Male to 13W3 Male(Sun) Cable - 6FT but that did not work.
Monoprice customer service was very helpful, send me a replacement but no luck.
I suspect that the Sun monitor has a different pinout.
The good news is the Sun 13W3-M to HD15-F (VGA) Video Port Adapter worked.
PROS: Well constructed
PROS: Fast delivery and cheap
CONS: Mounting screws are Wrong Size and do not fasten to rear of Sun Ultra workstation