| J || Half index register (ixh, ixl, iyh, iyl) || (i, b) = (0, 0), (0, 1), (1, 0), (1, 1)
|-
| n N || 8-bit immediate || nnnnnnnn
|-
| nn NN || 16-bit address or immediate || alalalal ahahahah
|-
| P || 16-bit register pair (bc, de, hl, af) || pp = 00, 01, 10, 11