Changes
Z80
,/* 16-bit Arithmetic group */
| add ixy,dd || 11i11101 00qq1001 || 4 || 15 (4,4,4,3) || - || - || + || + || + || - || 0 || + || ixy += dd
|-
| adc hl,dd || 11101101 01qq1010 || 4 || 15 (4,4,4,3) || + || + || + || + || + || V || 0 || + || hl += dd + cf ||Add with ccarryCarry
|-
| sbc hl,dd || 11101101 01qq0010 || 4 || 15 (4,4,4,3) || + || + || + || + || + || V || 1 || + || hl -= dd + cf ||Subtract with ccarryCarry
|-
| dec dd || 00qq1011 || 2 || 6 (6) || - || - || - || - || - || - || - || - || dd -= 1 ||rowspan=2|Decrement
