PCjs Machines

Intel 80286 CPU Information

80286 Errata

• Early Errata: A1 and B1 Steppings
• ARPL Behavior
• Coprocessor Operand Beyond Segment Limit
• Instructions Longer than 10 Bytes
• Loading Null Selector Values Into DS or ES Registers
• Non-Restartable Protection Violations
• POPF Behavior
• REP MOVS and REP INS Restartability

80286 Real-Mode Emulation Notes

• Executing Real Mode Programs in Protected Mode
• Discrepancies from an iAPX 86/88 Using Emulation
• Extending the Address Space of Current iAPX 86 Software
• Mixing Real Mode and Protected Mode
• Exceptions from Undefined Opcodes and String Instructions

80286 Undocumented Instructions

• LOADALL

80286 Documents

80286 ARPL and Overlength Instructions
(Oct 15, 1984)

80286 REP MOVS and REP INS Restartability
(Oct 15, 1984)

80286 B-2/B-3 Errata
(Nov 21, 1984)

80286/80287 Programmer Reference
(1987)

iAPX 286 Hardware Reference
(1983)

iAPX 286 OS Writer's Guide
(1983)

iAPX 286 Programmer Reference
(1985)