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The COP8 microcontroller from National Semiconductor is an 8 bit CISC core microcontroller, whose main features are:

• Large amount of I/O pins.
• Plenty of Flash memory/ROM for code and data (up to 32 KB).
• Very low EMI. No known bugs.
• Many integrated peripherals (meant as single chip design).
• In-System Programming
• Free assembler toolchain. Commercial C compilers available.
• Free Multitasking OS and TCP/IP stack.

It has a machine cycle of up to 2M cycles per second, but most versions seem to be overclockable to up to 2.8M cycles per second (28 MHz clock).