Changes
/* 16-bit Arithmetic group */
| dec pp || 00pp1011 || 2 || - || - || - || - || pp -= 1 || Decrement
|-
| add hl,pp || 00pp1001 || 2 || - || 0 || + || + || hl += pp ||rowspan=23|Add
|-
| add sp,e || 11101000 eeeeeeee || 4 || 0 || 0 || + || + || sp += e
