Changes
Z80
,/* 16-bit Arithmetic group */
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! Instruction !! Opcode !! NOPs !! Cycles !! M-Cycle Sequence !! S !! Z !! 5 !! H !! 3 !! P !! N !! C !! Effect !! Description
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| inc pp || 00pp0011 || 2 || 6 (6) || M1, INT(2) || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || pp += 1 ||rowspan=2|Increment
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| inc qq || DD/FD 00qq0011 || 3 || 10 (4,6) || M1, M1, INT(2) || qq += 1
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| dec pp || 00pp1011 || 2 || 6 (6) || M1, INT(2) || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || rowspan=2|- || pp -= 1 ||rowspan=2|Decrement
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| dec qq || DD/FD 00qq1011 || 3 || 10 (4,6) || M1, M1, INT(2) || qq -= 1
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| add hl,pp || 00pp1001 || 3 || 11 (4,4,3) || M1, INT(4), INT(3) || rowspan=2|- || rowspan=2|- || rowspan=2|+ || rowspan=2|+ || rowspan=2|+ || rowspan=2|- || rowspan=2|0 || rowspan=2|+ || hl += pp ||rowspan=2|Add
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| add ixy,qq || DD/FD 00qq1001 || 4 || 15 (4,4,4,3) || M1, M1, INT(4), INT(3) || ixy += qq
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| adc hl,qq || ED 01qq1010 || 4 || 15 (4,4,4,3) || M1, M1, INT(4), INT(3) || + || + || + || + || + || V || 0 || + || hl += qq + cf ||Add with Carry
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| sbc hl,qq || ED 01qq0010 || 4 || 15 (4,4,4,3) || M1, M1, INT(4), INT(3) || + || + || + || + || + || V || 1 || + || hl -= qq + cf ||Subtract with Carry
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