I have a Vivitar Zoom Thyristor 3500 flash I was looking for a user manual

they should both fire, but they were not meant for modern digital cameras, and the auto features the the camera may have won't be able to control this flash. so it just a manual strobe, to set your camera on manual and experiment.

that little pin on the bottom as well as the 2 on the inside of the flash shoe should fire the flash.

good luck.

You can either use a PC cord to connect the flash and camera, or you can use a remote trigger to fire the flash cordlessly. Your local camera store should be able to provide options for both.

It's safe according to the list at http://www.botzilla.com/photo/strobeVolts.html

It's "your call" according to this list.

Its trigger voltage is borderline according to this list.

DO NOT ATTEMPT TO USE THIS FLASH ON THE CAMERA OR TEHTER BY WIRE. THe voltage will destroy at least the built-in flash function of your camera. either use a radio slave, an optical slave or you can use it on camera if you use a WEIN safe-synch (approx. $70 USD). If you do not have the users guide for the flash, it can be GOOGLED. Search for "VIVITAR 285 users guide"

go here, they have it

Not compatible.
Get slave triggers and use them as remote flashes, or buy another film camera.
It seems Vivitar no longer is in the flash business. Get a Sigma or Sunpak digital flash for your SX10

Well give me a few days to look in my endless piles of stuff and I might have one I can scan for you.
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camera sync terminal wont work with even canon recommended flash.This can be the way to test your camera got damage.