So, you need connect normal monitor to you garge sale SGI indy computer?
8 bit indy card produces all needed signal for normal multisync monitor. All you need is 13W3 to VGA15 adapter. But if you want to do it in ugly and cheap way, install additional Hi15 d sub connector on free space and connect wires from one connector to other. Be carefull handling SGI graphics card. Electrostatic sensitive device.
Must work with other types of computers and video cards.
Or you can build special adapter using same schematics.

SVGA Hi15 (female at video card, male at cable)	13 Pin 13W3 female at computer
1 RED	R
2 GREEN	G
3 BLUE	B
5 GND	8, 9, 10
6 RED GND	R shield
7 GREEN GND	G shield
8 BLUE GND	B shield
10 SYNC GND (TTL GND)	10 SYNC GND
13 HSYNC or CSYNC	4
14 VSYNC	5

Reference docs: SVGA, 13W3.

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