The title says it all: Did we have working emulators for the 486/MS-DOS era back then? Would a 486 be capable enough to run a Game Boy emulator? If so what were they like?
Virtual Gameboy was the first gameboy emulator available and was first released on MS-DOS.
Today there are various other emulators available that also run on MS-DOS, such as CBEboy, cingb, NO$GB and various others.