This is a collection of my old GW-BASIC scripts from around 1991-1996. My dad had bought our first PC, a 386DX-40 which came with MS-DOS ... and GW-BASIC.
The oldest file I could dig out was dated 1992. I was 11 years at that time.
Microsoft just open-sourced GW-BASIC. However, if you're not into compiling that, the gwbasic.exe can be downloaded on archive.org. This should run fine in DOSBox.
Also, there's PC-BASIC which runs wherever Python can run.