00324nam a2200121 a 450000500170000002000150001708200200003210000180005224500610007025000120013126000420014330000170018520251203091725.0  a0070991510  a004.16,bD, OSB  aOsborne, Adam  aAn introduction to microcomputers; Vol.1: Basic concepts  a2nd ed.  aCaliforniabOsborne McGraw-Hillc1980  ax,300p, 24cm