Yep, an actual MS-DOS machine. With an Intel processor. The IBM PCjr was IBM's attempt at the home market. It was faster than either the Commodore or the Apple ][. It s competitors were 8 bit machines and limited to a maximun of 64K. The PCjr came with a base of 64K and an initial expansion to to 128K with more promised. But it was more expensive and not quite IBM PC compatible. Its expansion was weird and it used proprietary ports (electrically standard but mechanically different). It was produced from 1983 to 1985. Its advanced graphics mode was adopted for the Tandy 1000 series and became known as Tandy graphics.
This one I bought at Goodwill. For $5. I think the original list was around $1200. It works, well it would if I could find a 5.25" boot diskette. I have another one with an 3rd party 2nd disk drive. I had to talk a couple of kids out of it. They had found it in the trash before me. I had to explain to them that it would not ever run run Windows. After than they had no interest.