Registers
| |
name | |
reg. | |
(386) | |
| |
| acumulator | AX | EAX | AH : AL |
| base | BX | EBX | BH : BL |
| counter | CX | ECX | CH : CL |
| data | DX | EDX | DH : DL |
| stack pointer | SP | ESP |
| base pointer | BP | EBP |
| source index | SI | ESI |
| destination index | DI | EDI |
| instruction pointer | IP | EIP |
| code segment | CS |
| data segment | DS |
| stack segment | SS |
| extra segment | ES |
| extra segment | - | FS |
| extra segment | - | GS |
| register stack |
ST (8087) | |
|
|
Flags
| |
bit | |
flag | |
name | |
| 0 | CF | carry flag |
| 1 | 1 |
| 2 | PF | parity flag |
| 3 | 0 |
| 4 | AF | auxiliary carry flag |
| 5 | 0 |
| 6 | ZF | zero flag |
| 7 | SF | sign flag |
| 8 | TF | trap flag |
| 9 | IF | interrupt enable flag |
| 10 | DF | firection flag |
| 11 | OF | overflow flag |
| 12 | IOPL |
I/O privilege level |
| 13 |
| 14 | NT | nested task |
| 15 | 0 |
| 16 | RF | resume flag |
| 17 | VM | virtual 8086 mode |
| 18 | AC | alignment check |
| 19 | VIF | virtual interrupt flag |
| 20 | VIP | virtual interrupt pending |
| 21 | ID | ID flag |
| ... | 0 | |
|