I may very well be wrong, but I'm pretty sure that was a Compaq thing. I certainly don't remember BASIC coming with any version of DOS or Windows out of the box in 1984. May be later on in the decade.

Best I watch 'Pirates of Silicon Valley' to check a reliable source... /s

I wasn't sure about GW-BASIC. I remember running it on a PC that came with MS-DOS 4.0, but that came with the PC (a Laser 286) as well.

MS-DOS 5.0 was a shrink-wrapped box purchase, so I was sure it was "pure".