With the release of the M8051E-Warp core, Mentor Graphics® adds unique on-chip debug capabilities to the industry's leading 8051 architecture,'' said Mick O'Brien, general manager of the Inventra(TM) ...

The core’s advanced architecture yields the fastest 8051/80251-compatible MCU available anywhere (at the time of its release). It employs separate instruction and data buses (Harvard architecture), ...

[Andrew] picked up a handful of these big STC 8051 chips for a song and dance. The problem he has with them is the clunky VB6 programming software that only wants to run on a Windows box.