Worst selling consoles ever

[tom]

Here you have 1 system turning into a second system:
ColecoVision and Expansion modules #1 (turns Coleco into Atari VCS):


Laseractive and add-on modules (turns Laseractive into Genesis or TurboGrafx):


3DO Blaster add-on turns a PC into a 3DO:


Best of all:
2 systems from start (can be booted independently one or the other):
Sega TeraDrive, an IBM computer and MegaDrive console, both CPUs included):



Laseractive and TeraDrive are also worst sellers