[sitzkrieg]

indeed should have pointed out its the classic 8051 with a crazy clockspeed to compensate.

silabs simplicity studio is the only out of the box eclipse based IDE available for 8 bitters that i know of as well. i believe this is covered in jay carlsons amazing $1 mcu writeup. which is also good details for someone curious from this article ( https://news.ycombinator.com/item?id=19851744 )

[kjs3]

Well, that's kinda where 8051s get weird (not by a stretch the only way it's weird). 8051 performance is more '2 dimensional' in the sense it relies on clock speed as well as instructions-per-tick.

The 'classic' 8051 is (over simplifying) a 12-clock ticks per instruction processor. So you pretty quick had the second source providers introducing 6-clock and eventually 1-clock per instruction variants, with commiserate increases in speed. And then they jacked the clock speed.

So now you have '100 MIPS' 8051s, running at high clock speeds and 1-cycle per instruction.