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Added info & links to source material explaining the FX29 opcode (original answer flagged as low-quality because of its length and content)

edited Apr 7 at 19:25

Oops! I forgot to interpret exactly one very important opcode: FX29, which is used to draw the font:

FX29: Set I to the memory address of the sprite data corresponding to the hexadecimal digit stored in register VX

or in pseudocode: I = sprite_addr[Vx].

answered Apr 5 at 5:38