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Michiel van Oosterhout edited this page Feb 18, 2015 · 1 revision

Multiplication and division using CPU or PPU registers.

Multiplication using the CPU:

  • store 8-bit multiplicand in $4202
  • store 8-bit multiplier in $4203
  • wait 8 cycles
  • read 16-bit quotient from $4216

Division using the CPU:

  • store 16-bit dividend in $4204
  • store 8-bit divisor in $4206
  • wait 16 cycles
  • read 16-bit quotient from $4214
  • read 16-bit remainder from $4216

Multiplication using the PPU:

  • store 16-bit multiplicand in $211B
  • store 8-bit multiplier in $211C
  • wait
  • read 24-bit product from $2134
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