Most the olde kits used Printer and or serial ports, there was no such thing as USB back in the days of SNES ect..
There are hundreds of mods around most of what looks like what you posted are just empty shells made into something else (there are probobly just memory stick/hard disc drives in game cartrige shells)
There are some cool home modded consoles that got converted to handheld some just got put into other cases like a PSX in a NES case ect...
I will look for some olde dumping kits later
I do beleive there are newer flash kits though for Megadrive/SNES and possibly a few other olde consoles but those will cost you more than the consoles would
]
