Please Read again my solution:
it is ready for driving 10 digits of 16 segments each, and uses standard parts, so it is cheap. Eventually, you can use an extra controller (e.g. a 89C2051) to do the multiplexing part, so your main controller is not tied up with that.
Or, as mentionend by others, us a 89C51 or 89C52 dedicated for the display. So you have 2 8-bits ports for the segments,10 bits for the columns and 6 i/o ports left for communication with your main controller. It still will be necessary to buffer the drive lines though.

Henk