| Features | 80186 | 80C186/80C186XL |
| Manufacturing technology | NMOS | CHMOS |
| Operating modes | | Compatibility mode: 80186-compatible mode (except 8087)
Enhanced mode: 80C187 interface and new features
On Circuit emulation mode |
| Co-processor interface | 8087 | None (Compatible mode)
80C187 (Enhanced mode) |
| Integrated peripherals | | DRAM refresh control unit (Enhanced mode only)
Direct interface to co-processor in Enhanced mode |
| Power consumption | | Low: Approximately 20% (80C186) or 10% (80C186XL) from 80186 power consumption |
| Power-saving | None | Power-save mode: the processor operates at a fraction of external frequency |
| Pinout | | Some pins perform different functions in Enhanced mode: 33 (LCS), 34 (UCS), 35 (NPS), 37 (ERROR), 38 (PEREQ), 47 (Busy), 50 (HOLD), 51 (HLDA), and 64 (BHE) |
80C186XL is a 80C186 processor with redesigned core.
The 80C186XL has lower power consumption and higher operating frequencies
than the 80C186, other than that it's completely functionally and
pin-compatible with the 80C186.
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MMCS Definition incorrect in specification
NOTE: The Intel specification for the 186XL calls out unused bits 3-8 of the MMCS to be set to logic "0". This setting has never allowed our system to work and these bits are, instead, set to logic "1".