I was always puzzled about the choice (once I knew
what a T11 was). Other
than that, it's a 6502 and POKEY and "other stuff" on boards of that
generation, which you would expect from Atari, but not a T11.
Hmm... Atari commonly used the 6502 as the "main" processor, then
other devices for things like the "math box" (2901-based 16-bit vector
engine) for Battlezone, Star Wars, etc., so what's the T-11 doing in
Paperboy?
Communications and I/O (via POKEY), mostly. The T11 was doing the heavy
lifting and the 6502 handled grunt work. It may have also had a role in
sound (again via POKEY) but it's been a while since I looked at how it was
laid out.