"if you want to things with external ciruitury, 8085+8155 (multiple ports) does it for you with less external cicuitury"

Utter crap!

To build something equivalent to the Philips 668 you would need at least:
- an 8085
- an (E)PROM (64K)
- a RAM (8K)
- an 8155
- an external UART
And then some...

I won't even begin to do the same comparison for Cygnal.

Rob.