back2root:ibm-pc-ms-dos:hardware:80x86-architecture
Intel 80x86 Family Architecture
General purpose registers
| General Purpose Registers | Segment Registers |
| AH/AL | AX | (EAX) | Accumulator | CS | Code Segment |
| BH/BL | BX | (EBX) | Base | DS | Data Segment |
| CH/CL | CX | (ECX) | Counter | SS | Stack Segment |
| DH/DL | DX | (EDX) | Data | ES | Extra Segment |
| | | | | (FS) | 386 and newer |
| (Exx) indicates 386+ 32 bit register | (GS) | 386 and newer |
Pointers Registers
| Pointer Registers | Stack Registers |
| SI (ESI) | Source Index | SP (ESP) | Stack Pointer |
| DI (EDI) | Destination Index | BP (EBP) | Base Pointer |
| IP | Instruction Pointer | | |
Status Registers
| FLAGS | Status Flags (see FLAGS) |
Special Registers (386+ only)
| CR0 | Control Register 0 | DR0 | Debug Register 0 |
| CR2 | Control Register 2 | DR1 | Debug Register 1 |
| CR3 | Control Register 3 | DR2 | Debug Register 2 |
| | | DR3 | Debug Register 3 |
| TR4 | Test Register 4 | DR6 | Debug Register 6 |
| TR5 | Test Register 5 | DR7 | Debug Register 7 |
| TR6 | Test Register 6 | | |
| TR7 | Test Register 7 | | |
| Register | Default Segment | Valid Overrides |
| BP | SS | DS, ES, CS |
| SI or DI | DS | ES, SS, CS |
| DI strings | ES | None |
| SI strings | DS | ES, SS, CS |
back2root/ibm-pc-ms-dos/hardware/80x86-architecture.txt · Dernière modification : 2024/03/03 21:45 de frater
