On Jul 13, 13:50, Zane H. Healy wrote: has Only for the R,G,B coax connections. The rest of the pins are used for various monitor-type-sense and sync signals, and the SGI and Sun pinouts are quite different. To make matters worse, many SGI-badged monitors don't have the sync pins connected on the 13W3 (though you'll find articles on the web that explain how to get at the internal connections). And then to add insult to injury, SGI only put as many pins in their cables as they actually need (Sun mostly use fully-wired cables). Beige Indigo cables have one less pin than grey Indy cables! Lawrence is broadly correct about SGI/Sun and sync-on-green/composite sync. Indys and Indigos can generate separate sync, but the contemporary monitors mostly don't use it. The later ones do; the lack of sync is used to put the monitor into power-save, and Indys and O2s running IRIX 6.5 have *two* screensaver delays: the first for the saver to kick in, the second for the sync to be shut off to cause the monitor to power-save. In my experience, like Lawrence's, most badged monitors can handle all types of sync if you can get at it. The GDM-17E11 (SGI-badged Sony) for example has the sync connections inside, just not on the 13W3, and works fine with PCs and Suns if you add two wires. My HP-badged and DEC-badged GDM-1961HA, with 5 BNC and 3 BNC respectively, both support sync-on-green, and the DEC one has places to fit the extra 2 BNCs inside (IIRC you need to add resistors as well, and obviously you need to knock out two holes in the case). -- Pete Peter Turnbull Network Manager University of York