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If you wanted to use more interesting artwork for your sprites, you'd have to convert a 24x21 bitmap data to its binary representation, then load it into memory.
The original Commodore 64 User Manual had a nice sample program to do this on pages 70 and 71:
https://www.commodore.ca/manuals/c64_users_guide/c64-users_guide-06-sprite_graphics.pdf
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