Chips › Processors › Intel x86 family › Intel 80486
Intel 80486
1989
Intel's 1989 32-bit CPU integrating cache and FPU on-die, a mainstay of early-1990s PCs.
Emulators
| Emulator | Type | License | Site |
|---|---|---|---|
| Bochs | downloadable | LGPL-2.1 | Website ↗ |
| DOSBox ECE | downloadable | GPL-2.0 | Website ↗ |
| DOSBox Pure | downloadable | GPL-2.0 | Website ↗ |
| DOSBox Staging | downloadable | GPL-2.0 | Website ↗ |
| DOSBox-X | downloadable | GPL-2.0 | Website ↗ |
| JSLinux | online | Proprietary | Website ↗ |
| Microsoft Virtual PC | downloadable | Freeware | Website ↗ |
| PCem | downloadable | GPL-2.0 | Website ↗ |
| QEMU | downloadable | GPL-2.0 | Website ↗ |
| VMware Workstation | downloadable | Proprietary | Website ↗ |
| VirtualBox | downloadable | GPL-2.0 | Website ↗ |
Reference & documentation
External technical references for programming Intel 80486 and for writing emulators.
| Resource | Type | Notes |
|---|---|---|
| Intel 486DX Data Sheet (Oct 1992) ↗ | Datasheet | Official electrical, AC/DC and cycle timing |
| Embedded Intel486 Processor Family Developer's Manual ↗ | Datasheet | Full family specs, bus, timing, registers |
| Intel i486 Programmer's Reference Manual - Instruction Set ↗ | Instruction set | Full instruction encodings, opcodes, clock counts |
| sandpile.org - x86 Two-Byte Opcode Map ↗ | Instruction set | 0F opcode map, 486 instructions flagged |
| Undocumented OpCodes - Robert Collins ↗ | Instruction set | Undocumented 486 opcodes: LOADALL, ICEBP, UMOV, SALC |
| Intel 486DX Data Sheet - Pinout ↗ | Pinout | 168-pin PGA pinout and signal descriptions |
| Intel i486 Processor Programmer's Reference Manual (1990) ↗ | Programming | Canonical Intel 486 programming manual |
| 8086-80486 Instruction Set Reference (ITU) ↗ | Programming | Per-instruction reference with clock-cycle calculation |
| Intel Secrets, Bugs, and Undocumented Opcodes ↗ | Reference | 486 cache defects, DR7 quirks, hidden registers |
| Intel 486 Manuals Index - Robert Collins ↗ | Reference | Index of 486 manuals, datasheets, app notes |
| test386.asm x86 CPU Tester ↗ | Test suite | NASM BIOS-replacement conformance tester for emulators |