Hi,

My 2 Eurocents' worth :
I used 2 servos of this type (model aircraft/car stuff?) in my robot car (21 years ago now - Jeez!). With only 2, & an 8253 on board, there was no loss of processor time with delays & such.
A way to handle 12 (or 16 or 64) would be to set up the 20mS interrupt & a second interrupt sufficiently fast to give the required resolution over the 1mS +/-0.5mS range. Set up values for the servo positions, & every 20mS, turn on all the servo lines. Every interrupt#2, count down any non-zero values, turning off the relevant servo lines at zero.

Regards,

Richard