While updating an 1980s sourcebook in German language with a team within ABBUC we tried to clear some fog around the CPUs of the 400/800/XL/XE/XEGS machines - not really successful so far. Some of our team working on that issue tried to find hard facts or sources to prove what's really inside. Let's see what we'd found:   - 400/800 NTSC machines all seem to be equipped with 6502B CPUs, meaning 3MHz versions according to the manufacturer's coding. Why is that where 6502A (2MHz) would have been