Reyalp, that worked, thanks. I copied the files onto the card myself and then used the Make Card Bootable option*. Now when I move the lock slider thing it does boot automatically, but I think I will stick with manual boot most of the time because autoboot slows down turning on the camera, and could be annoying in situations where I just want a quick snapshot. Good to know I can do it though! I think I'll just slide the lock thing back and forth depending on the situation. (Autoboot when I'm taking artistic landscape photos; manual boot when I'm handing my camera to friends at a party.)
So the CHDK in general now works. I have two scripts I use on my SD1100 - the Ultra Intervelometer and the Fast Motion Detector. I installed them both a couple years ago. In general, can scripts be used on different camera models? Can I just copy the scripts from one camera's card to the other and use the ones I"m used to? Or are there camera-specific or newer scripts that I should get? The version of the CHDK automatically downloaded by the SDMInst app came with a bunch of scripts, one of which is called Motion, but it doesn't work the same as the one I'm used to.
Edit: Tried copying the scripts and they don't work - I get a message that says incompatible camera. So, where can I find scripts that are compatible with this camera? (The wiki page for this camera doesn't mention scripts, and the general lists of scripts don't seem to say which cameras they're compatible with, so I'm probably missing something, sorry for the basic questions.)
I need to buy some more SD cards - is there a size limit for using the chdk with this camera? Will I have problems if I get a big card?
*(I guess that didn't exist years ago last time I did this, so I didn't think of it...? I remember this being a lot more complicated. Or maybe the reason it was complicated was the Mac adding flags to files and using the SDMIst app to download them prevented that this time. In any case last time I remember having to do hexidecimal editing and this time I was able to just drag and drop files, so yay.)