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

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".