ModRegRM byte (16-bit addressing)
From Asmpedia
| mod=00 | AL/AX/EAX MM0/XMM0 reg=000 | CL/CX/ECX MM1/XMM1 reg=001 | DL/DX/EDX MM2/XMM2 reg=010 | BL/BX/EBX MM3/XMM3 reg=011 | AH/SP/ESP MM4/XMM4 reg=100 | CH/BP/EBP MM5/XMM5 reg=101 | DH/SI/ESI MM6/XMM6 reg=110 | BH/DI/EDI MM7/XMM7 reg=111 |
|---|---|---|---|---|---|---|---|---|
| [BX+SI] r/m=000 | 00 | 08 | 10 | 18 | 20 | 28 | 30 | 38 |
| [BX+DI] r/m=001 | 01 | 09 | 11 | 19 | 21 | 29 | 31 | 39 |
| [BP+SI] r/m=010 | 02 | 0A | 12 | 1A | 22 | 2A | 32 | 3A |
| [BP+DI] r/m=011 | 03 | 0B | 13 | 1B | 23 | 2B | 33 | 3B |
| [SI] r/m=100 | 04 | 0C | 14 | 1C | 24 | 2C | 34 | 3C |
| [DI] r/m=101 | 05 | 0D | 15 | 1D | 25 | 2D | 35 | 3D |
| disp16 follows r/m=110 | 06 | 0E | 16 | 1E | 26 | 2E | 36 | 3E |
| [BX] r/m=111 | 07 | 0F | 17 | 1F | 27 | 2F | 37 | 3F |
| mod=01 | AL/AX/EAX MM0/XMM0 reg=000 | CL/CX/ECX MM1/XMM1 reg=001 | DL/DX/EDX MM2/XMM2 reg=010 | BL/BX/EBX MM3/XMM3 reg=011 | AH/SP/ESP MM4/XMM4 reg=100 | CH/BP/EBP MM5/XMM5 reg=101 | DH/SI/ESI MM6/XMM6 reg=110 | BH/DI/EDI MM7/XMM7 reg=111 |
|---|---|---|---|---|---|---|---|---|
| [BX+SI+disp8] r/m=000 | 40 | 48 | 50 | 58 | 60 | 68 | 70 | 78 |
| [BX+DI+disp8] r/m=001 | 41 | 49 | 51 | 59 | 61 | 69 | 71 | 79 |
| [BP+SI+disp8] r/m=010 | 42 | 4A | 52 | 5A | 62 | 6A | 72 | 7A |
| [BP+DI+disp8] r/m=011 | 43 | 4B | 53 | 5B | 63 | 6B | 73 | 7B |
| [SI+disp8] r/m=100 | 44 | 4C | 54 | 5C | 64 | 6C | 74 | 7C |
| [DI+disp8] r/m=101 | 45 | 4D | 55 | 5D | 65 | 6D | 75 | 7D |
| [BP+disp8] r/m=110 | 46 | 4E | 56 | 5E | 66 | 6E | 76 | 7E |
| [BX+disp8] r/m=111 | 47 | 4F | 57 | 5F | 67 | 6F | 77 | 7F |
| mod=10 | AL/AX/EAX MM0/XMM0 reg=000 | CL/CX/ECX MM1/XMM1 reg=001 | DL/DX/EDX MM2/XMM2 reg=010 | BL/BX/EBX MM3/XMM3 reg=011 | AH/SP/ESP MM4/XMM4 reg=100 | CH/BP/EBP MM5/XMM5 reg=101 | DH/SI/ESI MM6/XMM6 reg=110 | BH/DI/EDI MM7/XMM7 reg=111 |
|---|---|---|---|---|---|---|---|---|
| [BX+SI+disp16] r/m=000 | 80 | 88 | 90 | 98 | A0 | A8 | B0 | B8 |
| [BX+DI+disp16] r/m=001 | 81 | 89 | 91 | 99 | A1 | A9 | B1 | B9 |
| [BP+SI+disp16] r/m=010 | 82 | 8A | 92 | 9A | A2 | AA | B2 | BA |
| [BP+DI+disp16] r/m=011 | 83 | 8B | 93 | 9B | A3 | AB | B3 | BB |
| [SI+disp16] r/m=100 | 84 | 8C | 94 | 9C | A4 | AC | B4 | BC |
| [DI+disp16] r/m=101 | 85 | 8D | 95 | 9D | A5 | AD | B5 | BD |
| [BP+disp16] r/m=110 | 86 | 8E | 96 | 9E | A6 | AE | B6 | BE |
| [BX+disp16] r/m=111 | 87 | 8F | 97 | 9F | A7 | AF | B7 | BF |
| mod=11 | AL/AX/EAX MM0/XMM0 reg=000 | CL/CX/ECX MM1/XMM1 reg=001 | DL/DX/EDX MM2/XMM2 reg=010 | BL/BX/EBX MM3/XMM3 reg=011 | AH/SP/ESP MM4/XMM4 reg=100 | CH/BP/EBP MM5/XMM5 reg=101 | DH/SI/ESI MM6/XMM6 reg=110 | BH/DI/EDI MM7/XMM7 reg=111 |
|---|---|---|---|---|---|---|---|---|
| AL/AX/EAX MM0/XMM0 r/m=000 | C0 | C8 | D0 | D8 | E0 | E8 | F0 | F8 |
| CL/CX/ECX MM1/XMM1 r/m=001 | C1 | C9 | D1 | D9 | E1 | E9 | F1 | F9 |
| DL/DX/EDX MM2/XMM2 r/m=010 | C2 | CA | D2 | DA | E2 | EA | F2 | FA |
| BL/BX/EBX MM3/XMM3 r/m=011 | C3 | CB | D3 | DB | E3 | EB | F3 | FB |
| AH/SP/ESP MM4/XMM4 r/m=100 | C4 | CC | D4 | DC | E4 | EC | F4 | FC |
| CH/BP/EBP MM5/XMM5 r/m=101 | C5 | CD | D5 | DD | E5 | ED | F5 | FD |
| DH/SI/ESI MM6/XMM6 r/m=110 | C6 | CE | D6 | DE | E6 | EE | F6 | FE |
| BH/DI/EDI MM7/XMM7 r/m=111 | C7 | CF | D7 | DF | E7 | EF | F7 | FF |
