Both isos (100 and 200 game compilations) are nothing more than hacked up auto-booting WHDLoad that works with 2MB chip ram. The games seem to be regular WHDLoad installable games, but perhaps their installers have also been tweaked to work, I don't know...
I too was interested in how it was done, and when you look into the ISO image, the contents reveal how it was really made to work. Not the details, but you get the general idea as there are a lot of *.slave files, WHDLoad in C:, etc.
