This is an entire PC-compatible single-board computer implemented with an 8051 microcontroller (!) running an x86 emulator.

I've been able to find very little about the Appotech AX-2005 System-on-chip, just the first page of its datasheet (it runs at 125Mhz):

http://www.mcupower.com.hk/EN/Products.php?b=Appotech