I believe much of the team that was working on the S900 left Commodore with Jack Tramiel, and were involved with the design of the Atari ST.
In particular Shiraz Shivji, who was the main designer of the ST, was part of the S900 project.
Pretty sure the S900 was effectively dead before the C128 project was even started.
And in any case the S900 was a monochrome business computer, aimed at the productivity market -- a segment Commodore later targeted with PC compatibles instead.
The C128 was targeted at consumers who wanted to run C64 games.
In particular Shiraz Shivji, who was the main designer of the ST, was part of the S900 project.
Pretty sure the S900 was effectively dead before the C128 project was even started.
And in any case the S900 was a monochrome business computer, aimed at the productivity market -- a segment Commodore later targeted with PC compatibles instead.
The C128 was targeted at consumers who wanted to run C64 games.