0 none
8-bit registers
1 AL
2 CL
3 DL
4 BL
5 AH
6 CH
7 DH
8 BH
16-bit registers
9 AX
10 CX
11 DX
12 BX
13 SP
14 BP
15 SI
16 DI
32-bit registers
17 EAX
18 ECX
19 EDX
20 EBX
21 ESP
22 EBP
23 ESI
24 EDI
Segment registers
25 ES
26 CS
27 SS
28 DS
29 FS
30 GS
Special cases
31 IP
32 FLAGS
33 EIP
34 EFLAGS
PCODE Registers
40 TEMP
41 TEMPH
42 QUOTE
43-47 Reserved
System Registers
80 CR0
81 CR1
82 CR2
83 CR3
90 DR0
91 DR1
92 DR2
93 DR3
94 DR4
95 DR5
96 DR6
97 DR7
Register extensions for 80x87
128 ST(0)
130 ST(2)
131 ST(3)
132 ST(4)
133 ST(5)
134 ST(6)
135 ST(7)
136 CONTROL
137 STATUS
138 TAG
139 FPIP
140 FPCS
141 FPDO
142 FPDS
143 ISEM
144 FPEIP
145 FPEDO