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Hi Ralph,
I have a IO-101 vector scope, too. I picked it up for $10 at an antiques mall. At the time I was just after the 3RP1 CRT, but recently I've found its built in pattern generators very handy. I haven't worked on any color sets yet so I'm not sure about its other capabilities.
I also do not have a manual or schematic. It's tougher to get Heath manuals now since whomever took control of what was left of the original company has reasserted their copyright on the materials. All the free scans have disappeared (except for some schematics). Vintagemanuals.com does have it listed for a hefty $35
Good luck,
Clark
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