First of all I got to say and I was surprised by the way you all helped me solving my keyboard interfacing issue, after I got it compiled right a friend of me helped me getting the code working as well. Works like a charm now, so thanks again :-).

Second, I want to make a led based display, short "research" and I concluded that the best format is 5*7 per char (6*7 with space). If assuming I want 10 chars, I'll need 130 I/O ports, since AT89S52 only features 32 I/O ports, and since I don't think using each of the microcontroller's I/O ports to each led is the right way, I wanted to know what is the best way to "expand" the amount of ports I have, or if there are special solutions for led matrixes.

Thanks in advance,
Shmulik Goldberg.