8 channel servo controller? The SC08A? and SKPS? Both SC08A and SKPS use UART to communicate with host, therefore you will need 2 UART on the microcontroller.
1st try to figure out how to interface. SKPS to PS2 is very straight forward. Just connect the PS2 plug to SKPS's socket. While referring to SKPS
User's Manual (where you can download from SKPS product page for details. You can also refer to one of our tutorial project on using SK40C,
project 15 for sample connection.
For SK40C to SC08A, you can again refer to the User's Manual or another tutorial about
Assembly of Small Robot Gripper.
Get familiar with separated system first, and try to integrate 2 system using
PR27:multi-UART example. Since SC08A and SKPS will depend on microcontroller command, using software UART should not create issue.
Good luck.