I just wrote out a long reply but it disapeared into cyberspace ...
Anyway, I have some limited TurboGrafx (PC Engine) sales:
PC Engine:
JP: 7.5m
NA: 2.5m
EU: Not released
I doubt that this includes PC Engine GT (greatest handheld ever IMO) sales.
Edit:
The same site claims TurboExpress (PC Engine GT) sales of 1.5m. It's unclear if this is just US or WW sales, but seeing as the TurboGrafx number was WW then this probably is too.
Link
I then argued that PC Engine should be classed as a third generation console, not a fourth generation console as many label it. Despite it's US name it was just an 8-bit console, same as the NES and SMS, not a 16-bit console like the Mega Drive and Super Famicom, and released just one year after the Sega Master System.
1983: NES (8-bit)
1986: SMS (8-bit)
1987: PCE (8-bit)
1988: SMD (16-bit)
1990: SFC (16-bit)
To be fair I should point out that the Master System was based on the SG-1000 Mark III which was first released in 1985. Still, the PC Engine should just be classed as a late third gen console, not an early fourth gen one.
