The first PC had a 8088 processor. Then came 80286, 386, 486, Pentium, Pentium2, Pentium3, Pentium4 ..... This 286 computer should be from the mid 80'ies. The 286s were also called AT, Advanced Technology. Typical specification: HDD 20 MB, RAM 1 MB, 8 MHz frequency, 5 1/4" floppy disk drive. Operating system MS-DOS, maybe Windows 2.0