Are SONY the first gaming company to have 4 systems on the go at the same time?

[TrevDaRev]

hatmoza said:
Yes, Nintendo:

Wii
DS
DSi
DSiXL
3DS
and soon to be
Wii U
and Modified Dual Stick 3DS

That's only 3. DS, Wii and 3DS. DSi, DSIXL are both DS's.