Hi COLGeek.
I had looked at the Vuescan drivers, but not installed them. From what I had read, it looked like they would run the scanner "generally".
I may be remembering it wrong, but I think that when using the slide adapter on the 6200c, you selected something in the original HP software. The adapter looks to be a simple plastic piece with two mirrors in it. The two mirrors would reflect the scanner light up, over, and down through the slide and that would then be "received" by the scanner hardware. I tried the adapter on a later HP all-in-one, but it doesn't work. Since the adapter is supposed to go in a particular corner on the HP 6200c, I am thinking that the scanner might be turning off the light from underneath the bed as it passes under the slide, so as not to interfere with the light which is being reflected through the slide from the top using the adapter.
I have been looking on eBay at 6200cs for sale, even some as parts, and I have sent inquiries as to whether the original CD is included. So far three swings, three misses. Some of the scanners were going for basically junk parts prices, in one case $24, and at that point if the original disk was there it might be well worth it to buy the hardware to get the software.
If all else fails I may try the Vuescan drivers, but I think it unlikely that they would do any better with the adapter then the other HP scanner I have does. I was wary of them when I first saw them mentioned (some time ago) since they seem to be a "one-size-fits-all" solution, but I now see that they appear to be well known and I have not seen any negative comments about them.
Anyway, I genuinely appreciate your efforts on my behalf, win lose or draw. It probably sounds like I am making a bigger deal out of this than it should be, but the slides I have are the only record in existence of what was once a beautiful old movie palace. I was a working projectionist at the time, and I actually showed the last movie ever in the theater before the wrecking ball came. Sad.
Thank you again COLGeek.
Andrew Ameden