Welcome to the forum !
A dump is only used for porting, i suppose you want a CHDK version for your cam ?
You will need to know your real version number, read here (Mac instructions near end of chapter)
FAQ - CHDK WikiOnce you have that, download your CHDK version here:
CHDK Download - build 0.8.10, revision #640(be sure to download the full version, especially the first time)
If your SD card is over 4 GB in size, you might want to experiment with CHDK first on the small card that
probably came with your cam. This is because SD1100 can only start from FAT16 formatted cards, and the
maximum size for a FAT16 filesystem is 4 GB.
Unpacking CHDK binries with a Mac can pose some problems, so be sure to read
the FAQ about Mac & CHDK:
FAQ/Mac - CHDK WikiThis user manual might also help:
http://home.roadrunner.com/~graystar/CHDKGuideInProgress03.pdfgood luck and have fun,
wim