3 ms·

It's likely it's 3 bytes of BCD (binary coded decimal). It's a handy way of storing things like scores, especially on 6502 processors which have built-in BCD h

by deater 3y ago

It's likely it's 3 bytes of BCD (binary coded decimal). It's a handy way of storing things like scores, especially on 6502 processors which have built-in BCD handling support.

hcs 3y ago
No BCD support on the specific chip used in the NES, though.
- tom_ 3y ago
  Looks like it might be doing the bcd by hand. See, e.g., L93C7 (and following code) in the disassembly here: https://github.com/CelestialAmber/TetrisNESDisasm https://github.com/CelestialAmber/TetrisNESDisasm