who built the first 8086/88 based puter?

Yes, and the 80186 was a marketing disaster for any company that tried to turn it into a PC. The integrated peripherals, while generally better than same facilities present on the PC aren't the least compatible. The wrong thing in a world dominated by hardware-manipulating applications, such as games, graphics utilities, backup programs, etc. I still have the Durango 80186 IO.SYS source for MS-DOS 1.25, as well as the OEM docs for 2.0. All of this was a shame, because an 80186-based PC offers a pretty substantial bang for the buck; the few NEC V40-based systems faced pretty much the same demise also. Yet, the 80186/88 found plenty of places embedded in things like modems where it was very successful. There is probably a fairly substantial list of "Almost PCs"--machines based on the x86 architecture but not 100% software compatible with the PC.