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In this old video Blender has 10 render slots: https://www.youtube.com/watch?v=bfMJ9NDpXAI
However, in my new 2.78 version, I see only 8 render slots. Is there a way to set the total number of slots? Actually, I would like to have more than 10.
During this commit a constant named IMA_MAX_RENDER_SLOT was introduced and set to 8.
You'd have to change the line
#define IMA_MAX_RENDER_SLOT 8
in source/blender/makesdna/DNA_image_types.h to something else and re-compile to change the number of slots.