maikschott/8086emulator

8086 emulator

8086 emulator

Primarily the CPU itself is implemented, supporting all 8086 and 80186 opcodes, including undocumented ones.

Additionally implemented internal devices are:

• CRT controller 6845 supporting 40×25, 80×25 monochrome and 16 colors text modes,
• DMA controller 8237,
• Programmable Interrupt Timer 8253,
• Programmable Peripheral Interface 8255 (keyboard controller),
• Programmable Interrupt Controller 8259,
• CMOS real time clock.

The emulator can run the original IBM PC BIOS and the IBM (Cassette) BASIC interpreter.

Used documentation:

• Intel 8086 Family User's Manual October, 1979
• Introduction to the 80186 Microprocessor (AP-186), 1983
• OSDev.org
• IBM PC BIOS (1982-10-27) listing

Future work

• graphic modes,
• better keyboard handling,
• floppy/hard disk drive controller,
• IBM PC XT or AT compatibility,
• etc.