Which microcontroller and IC's should i use to get 8 output pulse generated signals 0-5V TTL for controlling step/servo drives?
and has got another 2 * 8 I/O TTL?
It should be easy to controll motors by RS232 serial port.
Just sending pulse frequency, direction,number of steps
Z80 or AT mic
There are chips to convert RS232 to TTL level signals. If you used one of these chips, you could use about any micro which had the required i/o. There are probably micros with built in RS232 comm. but I am not aware of any off hand.